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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xml:lang="en-US">Related and Nonrelated Parties [Axis]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyMember_lbl" xml:lang="en-US">Related Party [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConvertibleDebtMember_lbl" xml:lang="en-US">Convertible Debt [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ShortTermMergerFinancingMember_lbl" xml:lang="en-US">Short Term Merger Financing [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SecuredConvertibleNotesMember_lbl" xml:lang="en-US">Secured Convertible Notes [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetAcquisitionAxis_lbl" xml:lang="en-US">Asset Acquisition [Axis]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PacsquareMember" xlink:to="ATCH_PacsquareMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PacsquareMember_lbl" xml:lang="en-US">Pacsquare [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermDebtMember" xlink:to="us-gaap_ShortTermDebtMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShortTermDebtMember_lbl" xml:lang="en-US">Short-Term Debt [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SeriesConvertibleDebenturesMember" xlink:to="ATCH_SeriesConvertibleDebenturesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SeriesConvertibleDebenturesMember_lbl" xml:lang="en-US">Series Convertible Debentures [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertiblePromissoryNotesMember" xlink:to="ATCH_ConvertiblePromissoryNotesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ConvertiblePromissoryNotesMember_lbl" xml:lang="en-US">Convertible Promissory Notes [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FunicularNoteMember" xlink:to="ATCH_FunicularNoteMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FunicularNoteMember_lbl" xml:lang="en-US">Funicular Note [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis" xlink:label="srt_StatementScenarioAxis" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_StatementScenarioAxis_lbl" xml:lang="en-US">Scenario [Axis]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PostReverseSplitMember" xlink:to="ATCH_PostReverseSplitMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PostReverseSplitMember_lbl" xml:lang="en-US">Post Reverse Split [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SellersNotesMember" xlink:to="ATCH_SellersNotesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SellersNotesMember_lbl" xml:lang="en-US">Sellers Notes [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ConvertibleNotesChardanMember" xlink:label="ATCH_ConvertibleNotesChardanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNotesChardanMember" xlink:to="ATCH_ConvertibleNotesChardanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ConvertibleNotesChardanMember_lbl" xml:lang="en-US">Convertible Notes Chardan [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WinstonAndStrawnAgreementMember" xlink:to="ATCH_WinstonAndStrawnAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WinstonAndStrawnAgreementMember_lbl" xml:lang="en-US">Winston &amp; Strawn Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TauAgreementMember" xlink:label="ATCH_TauAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TauAgreementMember" xlink:to="ATCH_TauAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TauAgreementMember_lbl" xml:lang="en-US">Tau Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_UnissuedStockBasedCompensationSharesMember" xlink:label="ATCH_UnissuedStockBasedCompensationSharesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_UnissuedStockBasedCompensationSharesMember" xlink:to="ATCH_UnissuedStockBasedCompensationSharesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_UnissuedStockBasedCompensationSharesMember_lbl" xml:lang="en-US">Unissued Stock Based Compensation Shares [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PromissoryNoteMember" xlink:label="ATCH_PromissoryNoteMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PromissoryNoteMember" xlink:to="ATCH_PromissoryNoteMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PromissoryNoteMember_lbl" xml:lang="en-US">Promissory Note [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConvertibleDebtSecuritiesMember_lbl" xml:lang="en-US">Convertible Debt Securities [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PublicWarrantsMember_lbl" xml:lang="en-US">Public Warrants [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PrivateWarrantsMember" xlink:label="ATCH_PrivateWarrantsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PrivateWarrantsMember" xlink:to="ATCH_PrivateWarrantsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PrivateWarrantsMember_lbl" xml:lang="en-US">Private Warrants [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TwoThousandTwentyFiveWarrantMember" xlink:label="ATCH_TwoThousandTwentyFiveWarrantMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TwoThousandTwentyFiveWarrantMember" xlink:to="ATCH_TwoThousandTwentyFiveWarrantMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TwoThousandTwentyFiveWarrantMember_lbl" xml:lang="en-US">2025 Warrant [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SecuredConvertibleNoteWarrantsMember" xlink:label="ATCH_SecuredConvertibleNoteWarrantsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SecuredConvertibleNoteWarrantsMember" xlink:to="ATCH_SecuredConvertibleNoteWarrantsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SecuredConvertibleNoteWarrantsMember_lbl" xml:lang="en-US">Secured Convertible Note Warrants [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsAxis" xlink:label="ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsAxis" xlink:to="ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsAxis_lbl" xml:lang="en-US">Cash and Securities Segregated under Federal and Other Regulations [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CustomersTransactionsAndCreditBalancesMember" xlink:label="ATCH_CustomersTransactionsAndCreditBalancesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CustomersTransactionsAndCreditBalancesMember" xlink:to="ATCH_CustomersTransactionsAndCreditBalancesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_CustomersTransactionsAndCreditBalancesMember_lbl" xml:lang="en-US">Customers Transactions and Credit Balances [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_BrokerDealerTransactionsAndCreditBalancesMember" xlink:label="ATCH_BrokerDealerTransactionsAndCreditBalancesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_BrokerDealerTransactionsAndCreditBalancesMember" xlink:to="ATCH_BrokerDealerTransactionsAndCreditBalancesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_BrokerDealerTransactionsAndCreditBalancesMember_lbl" xml:lang="en-US">Broker Dealer Transactions and Credit Balances [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis" xlink:label="srt_CounterpartyNameAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_CounterpartyNameAxis" xlink:to="srt_CounterpartyNameAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_CounterpartyNameAxis_lbl" xml:lang="en-US">Counterparty Name [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_AtlasFintechMember" xlink:label="ATCH_AtlasFintechMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AtlasFintechMember" xlink:to="ATCH_AtlasFintechMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_AtlasFintechMember_lbl" xml:lang="en-US">Atlas Fintech [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SellerNotesMember" xlink:label="ATCH_SellerNotesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SellerNotesMember" xlink:to="ATCH_SellerNotesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SellerNotesMember_lbl" xml:lang="en-US">Seller Notes [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SponsorMember" xlink:label="ATCH_SponsorMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SponsorMember" xlink:to="ATCH_SponsorMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SponsorMember_lbl" xml:lang="en-US">Sponsor [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LegalEntityAxis" xlink:to="dei_LegalEntityAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_LegalEntityAxis_lbl" xml:lang="en-US">Legal Entity [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_QuantumVenturesLLCMember" xlink:label="ATCH_QuantumVenturesLLCMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_QuantumVenturesLLCMember" xlink:to="ATCH_QuantumVenturesLLCMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_QuantumVenturesLLCMember_lbl" xml:lang="en-US">Quantum Ventures LLC [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_BoardOfDirectorsChairmanMember" xlink:label="srt_BoardOfDirectorsChairmanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_BoardOfDirectorsChairmanMember" xlink:to="srt_BoardOfDirectorsChairmanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_BoardOfDirectorsChairmanMember_lbl" xml:lang="en-US">Board of Directors Chairman [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_PresidentMember" xlink:label="srt_PresidentMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_PresidentMember" xlink:to="srt_PresidentMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_PresidentMember_lbl" xml:lang="en-US">President [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WilsonDavisMember" xlink:label="ATCH_WilsonDavisMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WilsonDavisMember" xlink:to="ATCH_WilsonDavisMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WilsonDavisMember_lbl" xml:lang="en-US">Wilson Davis [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SandipIPatelPAMember" xlink:label="ATCH_SandipIPatelPAMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SandipIPatelPAMember" xlink:to="ATCH_SandipIPatelPAMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SandipIPatelPAMember_lbl" xml:lang="en-US">Sandip I.Patel, P.A [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SixthBoroughCapitalFundLpMember" xlink:label="ATCH_SixthBoroughCapitalFundLpMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SixthBoroughCapitalFundLpMember" xlink:to="ATCH_SixthBoroughCapitalFundLpMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SixthBoroughCapitalFundLpMember_lbl" xml:lang="en-US">Sixth Borough Capital Fund Lp [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_TitleOfIndividualAxis" xlink:label="srt_TitleOfIndividualAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_TitleOfIndividualAxis_lbl" xml:lang="en-US">Title and Position [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_GeneralCounselAndChiefFinancialOfficerMember" xlink:label="ATCH_GeneralCounselAndChiefFinancialOfficerMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_GeneralCounselAndChiefFinancialOfficerMember" xlink:to="ATCH_GeneralCounselAndChiefFinancialOfficerMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_GeneralCounselAndChiefFinancialOfficerMember_lbl" xml:lang="en-US">General Counsel And Chief Financial Officer [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SandipPatelMember" xlink:label="ATCH_SandipPatelMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SandipPatelMember" xlink:to="ATCH_SandipPatelMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SandipPatelMember_lbl" xml:lang="en-US">Sandip Patel [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_AtlasclearInc.Member" xlink:label="ATCH_AtlasclearInc.Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AtlasclearInc.Member" xlink:to="ATCH_AtlasclearInc.Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_AtlasclearInc.Member_lbl" xml:lang="en-US">Atlasclear Inc [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_JohnSchaibleAndCraigRidenhourMember" xlink:label="ATCH_JohnSchaibleAndCraigRidenhourMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_JohnSchaibleAndCraigRidenhourMember" xlink:to="ATCH_JohnSchaibleAndCraigRidenhourMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_JohnSchaibleAndCraigRidenhourMember_lbl" xml:lang="en-US">John Schaible and Craig Ridenhour [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PayableImmediatelyMember" xlink:label="ATCH_PayableImmediatelyMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PayableImmediatelyMember" xlink:to="ATCH_PayableImmediatelyMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PayableImmediatelyMember_lbl" xml:lang="en-US">Payable Immediately [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PayableAtEndOfFirstQuarter2026Member" xlink:label="ATCH_PayableAtEndOfFirstQuarter2026Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PayableAtEndOfFirstQuarter2026Member" xlink:to="ATCH_PayableAtEndOfFirstQuarter2026Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PayableAtEndOfFirstQuarter2026Member_lbl" xml:lang="en-US">Payable At End Of First Quarter 2026 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_GrantedOnSigningMember" xlink:label="ATCH_GrantedOnSigningMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_GrantedOnSigningMember" xlink:to="ATCH_GrantedOnSigningMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_GrantedOnSigningMember_lbl" xml:lang="en-US">Granted On Signing [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_GrantedOnJuly12026Member" xlink:label="ATCH_GrantedOnJuly12026Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_GrantedOnJuly12026Member" xlink:to="ATCH_GrantedOnJuly12026Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_GrantedOnJuly12026Member_lbl" xml:lang="en-US">Granted On July 1 2026 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockPriceMilestoneOneMember" xlink:label="ATCH_StockPriceMilestoneOneMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPriceMilestoneOneMember" xlink:to="ATCH_StockPriceMilestoneOneMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockPriceMilestoneOneMember_lbl" xml:lang="en-US">Stock Price Milestone One [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockPriceMilestoneTwoMember" xlink:label="ATCH_StockPriceMilestoneTwoMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPriceMilestoneTwoMember" xlink:to="ATCH_StockPriceMilestoneTwoMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockPriceMilestoneTwoMember_lbl" xml:lang="en-US">Stock Price Milestone Two [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockPriceMilestoneThreeMember" xlink:label="ATCH_StockPriceMilestoneThreeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPriceMilestoneThreeMember" xlink:to="ATCH_StockPriceMilestoneThreeMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockPriceMilestoneThreeMember_lbl" xml:lang="en-US">Stock Price Milestone Three [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockPriceMilestoneFourMember" xlink:label="ATCH_StockPriceMilestoneFourMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPriceMilestoneFourMember" xlink:to="ATCH_StockPriceMilestoneFourMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockPriceMilestoneFourMember_lbl" xml:lang="en-US">Stock Price Milestone Four [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockPriceMilestoneFiveMember" xlink:label="ATCH_StockPriceMilestoneFiveMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPriceMilestoneFiveMember" xlink:to="ATCH_StockPriceMilestoneFiveMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockPriceMilestoneFiveMember_lbl" xml:lang="en-US">Stock Price Milestone Five [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WilsonDavisCoIncMember" xlink:label="ATCH_WilsonDavisCoIncMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WilsonDavisCoIncMember" xlink:to="ATCH_WilsonDavisCoIncMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WilsonDavisCoIncMember_lbl" xml:lang="en-US">Wilson Davis Co Inc [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ChardanCapitalMarketsLLCMember" xlink:label="ATCH_ChardanCapitalMarketsLLCMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ChardanCapitalMarketsLLCMember" xlink:to="ATCH_ChardanCapitalMarketsLLCMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ChardanCapitalMarketsLLCMember_lbl" xml:lang="en-US">Chardan Capital Markets LLC [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_RangeAxis" xlink:to="srt_RangeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_RangeAxis_lbl" xml:lang="en-US">Statistical Measurement [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MinimumMember" xlink:to="srt_MinimumMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_MinimumMember_lbl" xml:lang="en-US">Minimum [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MaximumMember" xlink:to="srt_MaximumMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_MaximumMember_lbl" xml:lang="en-US">Maximum [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WilsonDavisSellersMember" xlink:label="ATCH_WilsonDavisSellersMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WilsonDavisSellersMember" xlink:to="ATCH_WilsonDavisSellersMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WilsonDavisSellersMember_lbl" xml:lang="en-US">Wilson Davis Sellers [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ShortTermSellerNotesMember" xlink:label="ATCH_ShortTermSellerNotesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ShortTermSellerNotesMember" xlink:to="ATCH_ShortTermSellerNotesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ShortTermSellerNotesMember_lbl" xml:lang="en-US">Short Term Seller Notes [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_LongTermSellerNotesMember" xlink:label="ATCH_LongTermSellerNotesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LongTermSellerNotesMember" xlink:to="ATCH_LongTermSellerNotesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_LongTermSellerNotesMember_lbl" xml:lang="en-US">Long Term Seller Notes [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_JonesTradingNoteMember" xlink:label="ATCH_JonesTradingNoteMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_JonesTradingNoteMember" xlink:to="ATCH_JonesTradingNoteMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_JonesTradingNoteMember_lbl" xml:lang="en-US">Jones Trading Note [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PreReverseSplitMember" xlink:label="ATCH_PreReverseSplitMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PreReverseSplitMember" xlink:to="ATCH_PreReverseSplitMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PreReverseSplitMember_lbl" xml:lang="en-US">Pre Reverse Split [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_InterestSolutionsNoteMember" xlink:label="ATCH_InterestSolutionsNoteMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InterestSolutionsNoteMember" xlink:to="ATCH_InterestSolutionsNoteMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_InterestSolutionsNoteMember_lbl" xml:lang="en-US">Interest Solutions Note [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ToppanNoteMember" xlink:label="ATCH_ToppanNoteMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ToppanNoteMember" xlink:to="ATCH_ToppanNoteMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ToppanNoteMember_lbl" xml:lang="en-US">Toppan Note [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfArrangementAxis" xlink:label="us-gaap_TypeOfArrangementAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TypeOfArrangementAxis" xlink:to="us-gaap_TypeOfArrangementAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TypeOfArrangementAxis_lbl" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_HanirePurchaseAgreementMember" xlink:label="ATCH_HanirePurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_HanirePurchaseAgreementMember" xlink:to="ATCH_HanirePurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_HanirePurchaseAgreementMember_lbl" xml:lang="en-US">Hanire Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PremiumFinncingAgreementMember" xlink:label="ATCH_PremiumFinncingAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PremiumFinncingAgreementMember" xlink:to="ATCH_PremiumFinncingAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PremiumFinncingAgreementMember_lbl" xml:lang="en-US">Premium Finncing Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WinstonStrawnLLPMember" xlink:label="ATCH_WinstonStrawnLLPMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WinstonStrawnLLPMember" xlink:to="ATCH_WinstonStrawnLLPMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WinstonStrawnLLPMember_lbl" xml:lang="en-US">Winston Strawn L L P [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SettlementAgreementMember" xlink:label="ATCH_SettlementAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SettlementAgreementMember" xlink:to="ATCH_SettlementAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SettlementAgreementMember_lbl" xml:lang="en-US">Settlement Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SeriesAConvertibleDebenturesMember" xlink:label="ATCH_SeriesAConvertibleDebenturesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SeriesAConvertibleDebenturesMember" xlink:to="ATCH_SeriesAConvertibleDebenturesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SeriesAConvertibleDebenturesMember_lbl" xml:lang="en-US">Series A Convertible Debentures [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_AugustSecuritiesPurchaseAgreementMember" xlink:label="ATCH_AugustSecuritiesPurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AugustSecuritiesPurchaseAgreementMember" xlink:to="ATCH_AugustSecuritiesPurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_AugustSecuritiesPurchaseAgreementMember_lbl" xml:lang="en-US">August Securities Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SeptemberSecuritiesPurchaseAgreementMember" xlink:label="ATCH_SeptemberSecuritiesPurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SeptemberSecuritiesPurchaseAgreementMember" xlink:to="ATCH_SeptemberSecuritiesPurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SeptemberSecuritiesPurchaseAgreementMember_lbl" xml:lang="en-US">September Securities Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="us-gaap_ClassOfWarrantOrRightAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightAxis" xlink:to="us-gaap_ClassOfWarrantOrRightAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightAxis_lbl" xml:lang="en-US">Class of Warrant or Right [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xml:lang="en-US">Intangible Asset, Finite-Lived, Class [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillMember" xlink:label="us-gaap_GoodwillMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GoodwillMember" xlink:to="us-gaap_GoodwillMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GoodwillMember_lbl" xml:lang="en-US">Goodwill [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PacsquareAssetsProprietarySoftwareMember" xlink:label="ATCH_PacsquareAssetsProprietarySoftwareMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PacsquareAssetsProprietarySoftwareMember" xlink:to="ATCH_PacsquareAssetsProprietarySoftwareMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PacsquareAssetsProprietarySoftwareMember_lbl" xml:lang="en-US">Pacsquare Assets Proprietary Software [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerListsMember" xlink:label="us-gaap_CustomerListsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CustomerListsMember" xlink:to="us-gaap_CustomerListsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CustomerListsMember_lbl" xml:lang="en-US">Customer Lists [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ServicesLicenseAgreementMember" xlink:label="ATCH_ServicesLicenseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ServicesLicenseAgreementMember" xlink:to="ATCH_ServicesLicenseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ServicesLicenseAgreementMember_lbl" xml:lang="en-US">Services License Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_VendorMember" xlink:label="ATCH_VendorMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_VendorMember" xlink:to="ATCH_VendorMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_VendorMember_lbl" xml:lang="en-US">Vendor [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_InvestorWarrantsMember" xlink:label="ATCH_InvestorWarrantsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InvestorWarrantsMember" xlink:to="ATCH_InvestorWarrantsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_InvestorWarrantsMember_lbl" xml:lang="en-US">Investor Warrants [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PlacementAgentWarrantsMember" xlink:label="ATCH_PlacementAgentWarrantsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PlacementAgentWarrantsMember" xlink:to="ATCH_PlacementAgentWarrantsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PlacementAgentWarrantsMember_lbl" xml:lang="en-US">Placement Agent Warrants [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_AwardTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AwardTypeAxis_lbl" xml:lang="en-US">Award Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TimeBasedStockAwardsMember" xlink:label="ATCH_TimeBasedStockAwardsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TimeBasedStockAwardsMember" xlink:to="ATCH_TimeBasedStockAwardsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TimeBasedStockAwardsMember_lbl" xml:lang="en-US">Time Based Stock Awards [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PerformanceSharesMember" xlink:label="us-gaap_PerformanceSharesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PerformanceSharesMember" xlink:to="us-gaap_PerformanceSharesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PerformanceSharesMember_lbl" xml:lang="en-US">Performance Shares [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ExecutiveChairmanMember" xlink:label="ATCH_ExecutiveChairmanMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ExecutiveChairmanMember" xlink:to="ATCH_ExecutiveChairmanMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ExecutiveChairmanMember_lbl" xml:lang="en-US">Executive Chairman [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PerformanceBasedStockAwardOneMember" xlink:label="ATCH_PerformanceBasedStockAwardOneMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardOneMember" xlink:to="ATCH_PerformanceBasedStockAwardOneMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PerformanceBasedStockAwardOneMember_lbl" xml:lang="en-US">Performance Based Stock Award One [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PerformanceBasedStockAwardTwoMember" xlink:label="ATCH_PerformanceBasedStockAwardTwoMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardTwoMember" xlink:to="ATCH_PerformanceBasedStockAwardTwoMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PerformanceBasedStockAwardTwoMember_lbl" xml:lang="en-US">Performance Based Stock Award Two [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PerformanceBasedStockAwardThreeMember" xlink:label="ATCH_PerformanceBasedStockAwardThreeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardThreeMember" xlink:to="ATCH_PerformanceBasedStockAwardThreeMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PerformanceBasedStockAwardThreeMember_lbl" xml:lang="en-US">Performance Based Stock Award Three [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PerformanceBasedStockAwardFourMember" xlink:label="ATCH_PerformanceBasedStockAwardFourMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardFourMember" xlink:to="ATCH_PerformanceBasedStockAwardFourMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PerformanceBasedStockAwardFourMember_lbl" xml:lang="en-US">Performance Based Stock Award Four [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PerformanceBasedStockAwardFiveMember" xlink:label="ATCH_PerformanceBasedStockAwardFiveMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardFiveMember" xlink:to="ATCH_PerformanceBasedStockAwardFiveMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PerformanceBasedStockAwardFiveMember_lbl" xml:lang="en-US">Performance Based Stock Award Five [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PerformanceBasedStockAwardMember" xlink:label="ATCH_PerformanceBasedStockAwardMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardMember" xlink:to="ATCH_PerformanceBasedStockAwardMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PerformanceBasedStockAwardMember_lbl" xml:lang="en-US">Performance Based Stock Award [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VestingAxis" xlink:label="us-gaap_VestingAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_VestingAxis" xlink:to="us-gaap_VestingAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_VestingAxis_lbl" xml:lang="en-US">Vesting [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TrancheOneMember" xlink:label="ATCH_TrancheOneMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TrancheOneMember" xlink:to="ATCH_TrancheOneMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TrancheOneMember_lbl" xml:lang="en-US">Tranche One [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TrancheTwoMember" xlink:label="ATCH_TrancheTwoMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TrancheTwoMember" xlink:to="ATCH_TrancheTwoMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TrancheTwoMember_lbl" xml:lang="en-US">Tranche Two [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TrancheThreeMember" xlink:label="ATCH_TrancheThreeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TrancheThreeMember" xlink:to="ATCH_TrancheThreeMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TrancheThreeMember_lbl" xml:lang="en-US">Tranche Three [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TrancheFourMember" xlink:label="ATCH_TrancheFourMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TrancheFourMember" xlink:to="ATCH_TrancheFourMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TrancheFourMember_lbl" xml:lang="en-US">Tranche Four [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TrancheFiveMember" xlink:label="ATCH_TrancheFiveMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TrancheFiveMember" xlink:to="ATCH_TrancheFiveMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TrancheFiveMember_lbl" xml:lang="en-US">Tranche Five [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel1Member" xlink:to="us-gaap_FairValueInputsLevel1Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xml:lang="en-US">Fair Value, Inputs, Level 1 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel3Member" xlink:to="us-gaap_FairValueInputsLevel3Member_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xml:lang="en-US">Fair Value, Inputs, Level 3 [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ConvertibleNotesMember" xlink:label="ATCH_ConvertibleNotesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNotesMember" xlink:to="ATCH_ConvertibleNotesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ConvertibleNotesMember_lbl" xml:lang="en-US">Convertible Notes [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SecuredConvertibleNoteMember" xlink:label="ATCH_SecuredConvertibleNoteMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SecuredConvertibleNoteMember" xlink:to="ATCH_SecuredConvertibleNoteMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SecuredConvertibleNoteMember_lbl" xml:lang="en-US">Secured Convertible Note [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SettlementWinstonAndStrawnAgreementMember" xlink:label="ATCH_SettlementWinstonAndStrawnAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SettlementWinstonAndStrawnAgreementMember" xlink:to="ATCH_SettlementWinstonAndStrawnAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SettlementWinstonAndStrawnAgreementMember_lbl" xml:lang="en-US">Settlement Winston And Strawn Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_LongTermNotesMember" xlink:label="ATCH_LongTermNotesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LongTermNotesMember" xlink:to="ATCH_LongTermNotesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_LongTermNotesMember_lbl" xml:lang="en-US">Long Term Notes [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_LongTermNotesAndChardanNoteMember" xlink:label="ATCH_LongTermNotesAndChardanNoteMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LongTermNotesAndChardanNoteMember" xlink:to="ATCH_LongTermNotesAndChardanNoteMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_LongTermNotesAndChardanNoteMember_lbl" xml:lang="en-US">Long Term Notes And Chardan Note [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_MergerFinancingNoteMember" xlink:label="ATCH_MergerFinancingNoteMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingNoteMember" xlink:to="ATCH_MergerFinancingNoteMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_MergerFinancingNoteMember_lbl" xml:lang="en-US">Merger Financing Note [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SecuritiesPurchaseAgreementMember" xlink:label="ATCH_SecuritiesPurchaseAgreementMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SecuritiesPurchaseAgreementMember" xlink:to="ATCH_SecuritiesPurchaseAgreementMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SecuritiesPurchaseAgreementMember_lbl" xml:lang="en-US">Securities Purchase Agreement [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TwoThousandTwentyFiveWarrantLiabilityMember" xlink:label="ATCH_TwoThousandTwentyFiveWarrantLiabilityMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TwoThousandTwentyFiveWarrantLiabilityMember" xlink:to="ATCH_TwoThousandTwentyFiveWarrantLiabilityMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TwoThousandTwentyFiveWarrantLiabilityMember_lbl" xml:lang="en-US">Two Thousand Twenty Five Warrant Liability [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeAxis" xlink:label="us-gaap_MeasurementInputTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputTypeAxis" xlink:to="us-gaap_MeasurementInputTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputTypeAxis_lbl" xml:lang="en-US">Measurement Input Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputSharePriceMember" xlink:label="us-gaap_MeasurementInputSharePriceMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputSharePriceMember" xlink:to="us-gaap_MeasurementInputSharePriceMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputSharePriceMember_lbl" xml:lang="en-US">Measurement Input, Share Price [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputOptionVolatilityMember" xlink:label="us-gaap_MeasurementInputOptionVolatilityMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputOptionVolatilityMember" xlink:to="us-gaap_MeasurementInputOptionVolatilityMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputOptionVolatilityMember_lbl" xml:lang="en-US">Measurement Input, Option Volatility [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputRiskFreeInterestRateMember" xlink:label="us-gaap_MeasurementInputRiskFreeInterestRateMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputRiskFreeInterestRateMember" xlink:to="us-gaap_MeasurementInputRiskFreeInterestRateMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputRiskFreeInterestRateMember_lbl" xml:lang="en-US">Measurement Input, Risk Free Interest Rate [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputExpectedDividendRateMember" xlink:label="us-gaap_MeasurementInputExpectedDividendRateMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputExpectedDividendRateMember" xlink:to="us-gaap_MeasurementInputExpectedDividendRateMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputExpectedDividendRateMember_lbl" xml:lang="en-US">Measurement Input, Expected Dividend Rate [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputPriceVolatilityMember" xlink:label="us-gaap_MeasurementInputPriceVolatilityMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputPriceVolatilityMember" xlink:to="us-gaap_MeasurementInputPriceVolatilityMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputPriceVolatilityMember_lbl" xml:lang="en-US">Measurement Input, Price Volatility [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputExercisePriceMember" xlink:label="us-gaap_MeasurementInputExercisePriceMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputExercisePriceMember" xlink:to="us-gaap_MeasurementInputExercisePriceMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputExercisePriceMember_lbl" xml:lang="en-US">Measurement Input, Exercise Price [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputExpectedTermMember" xlink:label="us-gaap_MeasurementInputExpectedTermMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputExpectedTermMember" xlink:to="us-gaap_MeasurementInputExpectedTermMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputExpectedTermMember_lbl" xml:lang="en-US">Measurement Input, Expected Term [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputDiscountRateMember" xlink:label="us-gaap_MeasurementInputDiscountRateMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputDiscountRateMember" xlink:to="us-gaap_MeasurementInputDiscountRateMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputDiscountRateMember_lbl" xml:lang="en-US">Measurement Input, Discount Rate [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputDefaultRateMember" xlink:label="us-gaap_MeasurementInputDefaultRateMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputDefaultRateMember" xlink:to="us-gaap_MeasurementInputDefaultRateMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputDefaultRateMember_lbl" xml:lang="en-US">Measurement Input, Default Rate [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_MeasurementInputRecoveryRateMember" xlink:label="ATCH_MeasurementInputRecoveryRateMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MeasurementInputRecoveryRateMember" xlink:to="ATCH_MeasurementInputRecoveryRateMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_MeasurementInputRecoveryRateMember_lbl" xml:lang="en-US">Measurement Input Recovery Rate [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputConversionPriceMember" xlink:label="us-gaap_MeasurementInputConversionPriceMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MeasurementInputConversionPriceMember" xlink:to="us-gaap_MeasurementInputConversionPriceMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MeasurementInputConversionPriceMember_lbl" xml:lang="en-US">Measurement Input, Conversion Price [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_MeasurementInputInterestBalanceMember" xlink:label="ATCH_MeasurementInputInterestBalanceMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MeasurementInputInterestBalanceMember" xlink:to="ATCH_MeasurementInputInterestBalanceMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_MeasurementInputInterestBalanceMember_lbl" xml:lang="en-US">Measurement Input Interest Balance [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_MeasurementInputAnticipatedMonthlyAdvancePaymentsMember" xlink:label="ATCH_MeasurementInputAnticipatedMonthlyAdvancePaymentsMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MeasurementInputAnticipatedMonthlyAdvancePaymentsMember" xlink:to="ATCH_MeasurementInputAnticipatedMonthlyAdvancePaymentsMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_MeasurementInputAnticipatedMonthlyAdvancePaymentsMember_lbl" xml:lang="en-US">Measurement Input Anticipated Monthly Advance Payments [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="us-gaap_FairValueByLiabilityClassAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueByLiabilityClassAxis" xlink:to="us-gaap_FairValueByLiabilityClassAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueByLiabilityClassAxis_lbl" xml:lang="en-US">Liability Class [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember" xlink:label="us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember" xlink:to="us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_lbl" xml:lang="en-US">Derivative Financial Instruments, Liabilities [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EarnoutLiabilityMember" xlink:label="ATCH_EarnoutLiabilityMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnoutLiabilityMember" xlink:to="ATCH_EarnoutLiabilityMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EarnoutLiabilityMember_lbl" xml:lang="en-US">Earnout Liability [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_MergerFinancingDerivativeMember" xlink:label="ATCH_MergerFinancingDerivativeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingDerivativeMember" xlink:to="ATCH_MergerFinancingDerivativeMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_MergerFinancingDerivativeMember_lbl" xml:lang="en-US">Merger Financing Derivative [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ContingentGuaranteeMember" xlink:label="ATCH_ContingentGuaranteeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ContingentGuaranteeMember" xlink:to="ATCH_ContingentGuaranteeMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ContingentGuaranteeMember_lbl" xml:lang="en-US">Contingent Guarantee [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SecuredConvertibleDerivativeMember" xlink:label="ATCH_SecuredConvertibleDerivativeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SecuredConvertibleDerivativeMember" xlink:to="ATCH_SecuredConvertibleDerivativeMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SecuredConvertibleDerivativeMember_lbl" xml:lang="en-US">Secured Convertible Derivative [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebentureDerivativeMember" xlink:label="ATCH_DebentureDerivativeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebentureDerivativeMember" xlink:to="ATCH_DebentureDerivativeMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebentureDerivativeMember_lbl" xml:lang="en-US">Debenture Derivative [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ConvertibleNoteDerivativeMember" xlink:label="ATCH_ConvertibleNoteDerivativeMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNoteDerivativeMember" xlink:to="ATCH_ConvertibleNoteDerivativeMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ConvertibleNoteDerivativeMember_lbl" xml:lang="en-US">Convertible Note Derivative [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="us-gaap_SubsequentEventTypeAxis" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeAxis_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xml:lang="en-US">Subsequent Event Type [Axis]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember" xlink:label="us-gaap_SubsequentEventMember" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventMember" xlink:to="us-gaap_SubsequentEventMember_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventMember_lbl" xml:lang="en-US">Subsequent Event [Member]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CoverAbstract" xlink:label="dei_CoverAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CoverAbstract" xlink:to="dei_CoverAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CoverAbstract_lbl" xml:lang="en-US">Cover [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType" xlink:label="dei_DocumentType" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentType" xlink:to="dei_DocumentType_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentType_lbl" xml:lang="en-US">Document Type</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentFlag" xlink:to="dei_AmendmentFlag_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentFlag_lbl" xml:lang="en-US">Amendment Flag</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentDescription" xlink:label="dei_AmendmentDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentDescription" xlink:to="dei_AmendmentDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AmendmentDescription_lbl" xml:lang="en-US">Amendment Description</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentRegistrationStatement" xlink:to="dei_DocumentRegistrationStatement_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentAnnualReport" xlink:to="dei_DocumentAnnualReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentAnnualReport_lbl" xml:lang="en-US">Document Annual Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentQuarterlyReport" xlink:label="dei_DocumentQuarterlyReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentQuarterlyReport" xlink:to="dei_DocumentQuarterlyReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentQuarterlyReport_lbl" xml:lang="en-US">Document Quarterly Report</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentTransitionReport" xlink:to="dei_DocumentTransitionReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentTransitionReport_lbl" xml:lang="en-US">Document Transition Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentShellCompanyReport" xlink:label="dei_DocumentShellCompanyReport" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentShellCompanyReport" xlink:to="dei_DocumentShellCompanyReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentShellCompanyReport_lbl" xml:lang="en-US">Document Shell Company Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentShellCompanyEventDate" xlink:label="dei_DocumentShellCompanyEventDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentShellCompanyEventDate" xlink:to="dei_DocumentShellCompanyEventDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentShellCompanyEventDate_lbl" xml:lang="en-US">Document Shell Company Event Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodStartDate" xlink:label="dei_DocumentPeriodStartDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodStartDate" xlink:to="dei_DocumentPeriodStartDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodStartDate_lbl" xml:lang="en-US">Document Period Start Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US">Document Period End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US">Document Fiscal Period Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalYearFocus" xlink:label="dei_DocumentFiscalYearFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US">Document Fiscal Year Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US">Current Fiscal Year End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFileNumber" xlink:to="dei_EntityFileNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFileNumber_lbl" xml:lang="en-US">Entity File Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US">Entity Registrant Name</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US">Entity Central Index Key</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityPrimarySicNumber" xlink:label="dei_EntityPrimarySicNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityPrimarySicNumber" xlink:to="dei_EntityPrimarySicNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityPrimarySicNumber_lbl" xml:lang="en-US">Entity Primary SIC Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber" xlink:label="dei_EntityTaxIdentificationNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityTaxIdentificationNumber" xlink:to="dei_EntityTaxIdentificationNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xml:lang="en-US">Entity Tax Identification Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityIncorporationStateCountryCode" xlink:to="dei_EntityIncorporationStateCountryCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine1" xlink:to="dei_EntityAddressAddressLine1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine1_lbl" xml:lang="en-US">Entity Address, Address Line One</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine2" xlink:label="dei_EntityAddressAddressLine2" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine2" xlink:to="dei_EntityAddressAddressLine2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine2_lbl" xml:lang="en-US">Entity Address, Address Line Two</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine3" xlink:label="dei_EntityAddressAddressLine3" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine3" xlink:to="dei_EntityAddressAddressLine3_lbl" xlink:type="arc" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown" xlink:label="dei_EntityAddressCityOrTown" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCityOrTown_lbl" xml:lang="en-US">Entity Address, City or Town</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince" xlink:label="dei_EntityAddressStateOrProvince" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressStateOrProvince_lbl" xml:lang="en-US">Entity Address, State or Province</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCountry" xlink:label="dei_EntityAddressCountry" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressCountry" xlink:to="dei_EntityAddressCountry_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCountry_lbl" xml:lang="en-US">Entity Address, Country</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressPostalZipCode_lbl" xml:lang="en-US">Entity Address, Postal Zip Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CountryRegion" xlink:label="dei_CountryRegion" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CountryRegion" xlink:to="dei_CountryRegion_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CountryRegion_lbl" xml:lang="en-US">Country Region</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode" xlink:label="dei_CityAreaCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CityAreaCode" xlink:to="dei_CityAreaCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CityAreaCode_lbl" xml:lang="en-US">City Area Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber" xlink:label="dei_LocalPhoneNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LocalPhoneNumber" xlink:to="dei_LocalPhoneNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_LocalPhoneNumber_lbl" xml:lang="en-US">Local Phone Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Extension" xlink:label="dei_Extension" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Extension" xlink:to="dei_Extension_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Extension_lbl" xml:lang="en-US">Extension</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_WrittenCommunications" xlink:to="dei_WrittenCommunications_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_WrittenCommunications_lbl" xml:lang="en-US">Written Communications</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial" xlink:label="dei_SolicitingMaterial" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SolicitingMaterial" xlink:to="dei_SolicitingMaterial_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SolicitingMaterial_lbl" xml:lang="en-US">Soliciting Material</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer" xlink:label="dei_PreCommencementTenderOffer" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementTenderOffer" xlink:to="dei_PreCommencementTenderOffer_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_PreCommencementTenderOffer_lbl" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer" xlink:label="dei_PreCommencementIssuerTenderOffer" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementIssuerTenderOffer" xlink:to="dei_PreCommencementIssuerTenderOffer_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_PreCommencementIssuerTenderOffer_lbl" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle" xlink:label="dei_Security12bTitle" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12bTitle" xlink:to="dei_Security12bTitle_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Security12bTitle_lbl" xml:lang="en-US">Title of 12(b) Security</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_NoTradingSymbolFlag" xlink:label="dei_NoTradingSymbolFlag" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_NoTradingSymbolFlag" xlink:to="dei_NoTradingSymbolFlag_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_NoTradingSymbolFlag_lbl" xml:lang="en-US">No Trading Symbol Flag</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_TradingSymbol" xlink:to="dei_TradingSymbol_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_TradingSymbol_lbl" xml:lang="en-US">Trading Symbol</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName" xlink:label="dei_SecurityExchangeName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SecurityExchangeName" xlink:to="dei_SecurityExchangeName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SecurityExchangeName_lbl" xml:lang="en-US">Security Exchange Name</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12gTitle" xlink:label="dei_Security12gTitle" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12gTitle" xlink:to="dei_Security12gTitle_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Security12gTitle_lbl" xml:lang="en-US">Title of 12(g) Security</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityReportingObligation" xlink:label="dei_SecurityReportingObligation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SecurityReportingObligation" xlink:to="dei_SecurityReportingObligation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SecurityReportingObligation_lbl" xml:lang="en-US">Security Reporting Obligation</link:label>
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany" xlink:label="dei_EntityEmergingGrowthCompany" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xml:lang="en-US">Entity Emerging Growth Company</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityExTransitionPeriod_lbl" xml:lang="en-US">Elected Not To Use the Extended Transition Period</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentAccountingStandard" xlink:label="dei_DocumentAccountingStandard" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentAccountingStandard_lbl" xml:lang="en-US">Document Accounting Standard</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_OtherReportingStandardItemNumber_lbl" xml:lang="en-US">Other Reporting Standard Item Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityShellCompany" xlink:label="dei_EntityShellCompany" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityPublicFloat" xlink:label="dei_EntityPublicFloat" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityBankruptcyProceedingsReportingCurrent" xlink:label="dei_EntityBankruptcyProceedingsReportingCurrent" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="dei_EntityCommonStockSharesOutstanding" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_CommercialBankAcquisitionDeposit_lbl" xml:lang="en-US">Bank acquisition deposit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="us-gaap_OtherAssetsNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsNoncurrent" xlink:to="us-gaap_OtherAssetsNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xml:lang="en-US">Other assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US">TOTAL ASSETS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xml:lang="en-US">LIABILITIES AND STOCKHOLDERS&#8217; EQUITY (DEFICIT)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="us-gaap_LiabilitiesCurrentAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xml:lang="en-US">LIABILITIES</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_PayablesToCustomers" xlink:label="srt_PayablesToCustomers" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_PayablesToCustomers" xlink:to="srt_PayablesToCustomers_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_PayablesToCustomers_lbl" xml:lang="en-US">Payables to customers</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_AccountsAndPayablesToOfficersAndDirectorsCurrent" xlink:label="ATCH_AccountsAndPayablesToOfficersAndDirectorsCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AccountsAndPayablesToOfficersAndDirectorsCurrent" xlink:to="ATCH_AccountsAndPayablesToOfficersAndDirectorsCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_AccountsAndPayablesToOfficersAndDirectorsCurrent_lbl" xml:lang="en-US">Accounts and payables to officers/directors</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:to="us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_lbl" xml:lang="en-US">Accounts payable and accrued expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_PayablesToBrokerDealersAndClearingOrganizations" xlink:label="srt_PayablesToBrokerDealersAndClearingOrganizations" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_PayablesToBrokerDealersAndClearingOrganizations" xlink:to="srt_PayablesToBrokerDealersAndClearingOrganizations_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_PayablesToBrokerDealersAndClearingOrganizations_lbl" xml:lang="en-US">Payables - broker-dealers and clearing organizations</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CommissionsPayrollAndPayrollTaxesCurrent" xlink:label="ATCH_CommissionsPayrollAndPayrollTaxesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommissionsPayrollAndPayrollTaxesCurrent" xlink:to="ATCH_CommissionsPayrollAndPayrollTaxesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_CommissionsPayrollAndPayrollTaxesCurrent_lbl" xml:lang="en-US">Commissions, payroll and payroll taxes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityCurrent" xlink:to="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xml:lang="en-US">Current portion of lease liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesPayableCurrent" xlink:label="us-gaap_NotesPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NotesPayableCurrent" xlink:to="us-gaap_NotesPayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NotesPayableCurrent_lbl" xml:lang="en-US">Promissory notes</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_LongTermMergerFinancingCurrent" xlink:label="ATCH_LongTermMergerFinancingCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LongTermMergerFinancingCurrent" xlink:to="ATCH_LongTermMergerFinancingCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_LongTermMergerFinancingCurrent_lbl" xml:lang="en-US">Current portion of long-term merger financing, net</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_MergerFinancingPayable" xlink:label="ATCH_MergerFinancingPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingPayable" xlink:to="ATCH_MergerFinancingPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_MergerFinancingPayable_lbl" xml:lang="en-US">Merger financing payable</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiabilityCurrent" xlink:label="ATCH_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiabilityCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiabilityCurrent" xlink:to="ATCH_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiabilityCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiabilityCurrent_lbl" xml:lang="en-US">Convertible Notes - derivative</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SharePurchaseCommitmentAmountCurrent" xlink:label="ATCH_SharePurchaseCommitmentAmountCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharePurchaseCommitmentAmountCurrent" xlink:to="ATCH_SharePurchaseCommitmentAmountCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SharePurchaseCommitmentAmountCurrent_lbl" xml:lang="en-US">Tau agreement liability</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebentureCurrent" xlink:label="ATCH_DebentureCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebentureCurrent" xlink:to="ATCH_DebentureCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebentureCurrent_lbl" xml:lang="en-US">Debenture</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WinstonStrawnAgreementCurrent" xlink:label="ATCH_WinstonStrawnAgreementCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WinstonStrawnAgreementCurrent" xlink:to="ATCH_WinstonStrawnAgreementCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WinstonStrawnAgreementCurrent_lbl" xml:lang="en-US">Winston &amp; Strawn agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockPayableCurrent" xlink:label="ATCH_StockPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPayableCurrent" xlink:to="ATCH_StockPayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockPayableCurrent_lbl" xml:lang="en-US">Stock payable &#8211; related party</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesAndExciseTaxPayableCurrent" xlink:label="us-gaap_SalesAndExciseTaxPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SalesAndExciseTaxPayableCurrent" xlink:to="us-gaap_SalesAndExciseTaxPayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SalesAndExciseTaxPayableCurrent_lbl" xml:lang="en-US">Excise tax payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent" xlink:label="us-gaap_LiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xml:lang="en-US">Total Current Liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyAccrualCarryingValueNoncurrent" xlink:label="us-gaap_LossContingencyAccrualCarryingValueNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingencyAccrualCarryingValueNoncurrent" xlink:to="us-gaap_LossContingencyAccrualCarryingValueNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingencyAccrualCarryingValueNoncurrent_lbl" xml:lang="en-US">Accrued contingent liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredLongTermDebt" xlink:label="us-gaap_SecuredLongTermDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SecuredLongTermDebt" xlink:to="us-gaap_SecuredLongTermDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SecuredLongTermDebt_lbl" xml:lang="en-US">Secured convertible note, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtNoncurrent" xlink:label="us-gaap_ConvertibleDebtNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConvertibleDebtNoncurrent" xlink:to="us-gaap_ConvertibleDebtNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConvertibleDebtNoncurrent_lbl" xml:lang="en-US">Long-term convertible note Chardan, net</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WarrantsLiabilitiesNonCurrent" xlink:label="ATCH_WarrantsLiabilitiesNonCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WarrantsLiabilitiesNonCurrent" xlink:to="ATCH_WarrantsLiabilitiesNonCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WarrantsLiabilitiesNonCurrent_lbl" xml:lang="en-US">2025 Warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DerivativeLiabilityWarrants" xlink:label="ATCH_DerivativeLiabilityWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeLiabilityWarrants" xlink:to="ATCH_DerivativeLiabilityWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DerivativeLiabilityWarrants_lbl" xml:lang="en-US">Derivative liability - Warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EarnoutLiabilitiesNoncurrent" xlink:label="ATCH_EarnoutLiabilitiesNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnoutLiabilitiesNoncurrent" xlink:to="ATCH_EarnoutLiabilitiesNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EarnoutLiabilitiesNoncurrent_lbl" xml:lang="en-US">Earnout - liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="us-gaap_DeferredIncomeTaxLiabilitiesNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:to="us-gaap_DeferredIncomeTaxLiabilitiesNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredIncomeTaxLiabilitiesNet_lbl" xml:lang="en-US">Deferred income tax liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubordinatedLongTermDebt" xlink:label="us-gaap_SubordinatedLongTermDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubordinatedLongTermDebt" xlink:to="us-gaap_SubordinatedLongTermDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubordinatedLongTermDebt_lbl" xml:lang="en-US">Subordinated borrowings</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TradingAccountDepositNoncurrent" xlink:label="ATCH_TradingAccountDepositNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TradingAccountDepositNoncurrent" xlink:to="ATCH_TradingAccountDepositNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TradingAccountDepositNoncurrent_lbl" xml:lang="en-US">Trading account deposit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:to="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xml:lang="en-US">Long-term lease liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US">TOTAL LIABILITIES</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="us-gaap_CommitmentsAndContingencies" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingencies" xlink:to="us-gaap_CommitmentsAndContingencies_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xml:lang="en-US">Commitments and Contingencies (Note 8)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="us-gaap_StockholdersEquityAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquityAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xml:lang="en-US">STOCKHOLDERS&#8217; EQUITY (DEFICIT)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockValue" xlink:label="us-gaap_PreferredStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockValue" xlink:to="us-gaap_PreferredStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockValue_lbl" xml:lang="en-US">Preferred stock, $0.0001 par value; 25,000,000 shares authorized; none issued or outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockValue" xlink:to="us-gaap_CommonStockValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockValue_lbl" xml:lang="en-US">Common stock, $0.0001 par value; 500,000,000 shares authorized; 149,794,297 and 40,165,603 shares issued and outstanding at March 31, 2026 and June 30, 2025, respectively</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="us-gaap_AdditionalPaidInCapital" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapital" xlink:to="us-gaap_AdditionalPaidInCapital_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xml:lang="en-US">Additional paid-in-capital</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable" xlink:label="us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable" xlink:to="us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable_lbl" xml:lang="en-US">Stock subscription receivable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xml:lang="en-US">Accumulated Deficit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity" xlink:label="us-gaap_StockholdersEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US">TOTAL STOCKHOLDERS&#8217; EQUITY (DEFICIT)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US">TOTAL LIABILITIES AND STOCKHOLDERS&#8217; EQUITY (DEFICIT)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="us-gaap_StatementOfFinancialPositionAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StatementOfFinancialPositionAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AllowanceForDoubtfulAccountsReceivable" xlink:to="us-gaap_AllowanceForDoubtfulAccountsReceivable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivable_lbl" xml:lang="en-US">Allowance for credit losses</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockParOrStatedValuePerShare" xlink:to="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xml:lang="en-US">Preferred stock, par value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="us-gaap_PreferredStockSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesAuthorized" xlink:to="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xml:lang="en-US">Preferred stock, shares authorized</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="us-gaap_PreferredStockSharesIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesIssued" xlink:to="us-gaap_PreferredStockSharesIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xml:lang="en-US">Preferred stock, shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="us-gaap_PreferredStockSharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesOutstanding" xlink:to="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xml:lang="en-US">Preferred stock, shares outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xml:lang="en-US">Common stock, par value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="us-gaap_CommonStockSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesAuthorized" xlink:to="us-gaap_CommonStockSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xml:lang="en-US">Common stock, shares authorized</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xml:lang="en-US">Common stock, shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="us-gaap_CommonStockSharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xml:lang="en-US">Common stock, shares outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementAbstract" xlink:label="us-gaap_IncomeStatementAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_IncomeStatementAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xml:lang="en-US">Income Statement [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesAbstract" xlink:label="us-gaap_RevenuesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenuesAbstract" xlink:to="us-gaap_RevenuesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenuesAbstract_lbl" xml:lang="en-US">REVENUES</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BrokerageCommissionsRevenue" xlink:label="us-gaap_BrokerageCommissionsRevenue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BrokerageCommissionsRevenue" xlink:to="us-gaap_BrokerageCommissionsRevenue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BrokerageCommissionsRevenue_lbl" xml:lang="en-US">Commissions</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_RevenueFromVettingProcessingFees" xlink:label="ATCH_RevenueFromVettingProcessingFees" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RevenueFromVettingProcessingFees" xlink:to="ATCH_RevenueFromVettingProcessingFees_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_RevenueFromVettingProcessingFees_lbl" xml:lang="en-US">Vetting fees</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_RevenueFromClearanceFees" xlink:label="ATCH_RevenueFromClearanceFees" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RevenueFromClearanceFees" xlink:to="ATCH_RevenueFromClearanceFees_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_RevenueFromClearanceFees_lbl" xml:lang="en-US">Clearing fees</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingGainsLosses" xlink:label="us-gaap_TradingGainsLosses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TradingGainsLosses" xlink:to="us-gaap_TradingGainsLosses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TradingGainsLosses_lbl" xml:lang="en-US">Net gain/(loss) on firm trading accounts</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueNotFromContractWithCustomerOther" xlink:label="us-gaap_RevenueNotFromContractWithCustomerOther" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueNotFromContractWithCustomerOther" xlink:to="us-gaap_RevenueNotFromContractWithCustomerOther_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueNotFromContractWithCustomerOther_lbl" xml:lang="en-US">Stock locate fees</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues" xlink:label="us-gaap_Revenues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Revenues" xlink:to="us-gaap_Revenues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Revenues_lbl" xml:lang="en-US">TOTAL REVENUES</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="us-gaap_OperatingExpensesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingExpensesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xml:lang="en-US">EXPENSES</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="us-gaap_LaborAndRelatedExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LaborAndRelatedExpense" xlink:to="us-gaap_LaborAndRelatedExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LaborAndRelatedExpense_lbl" xml:lang="en-US">Compensation, payroll taxes and benefits</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DataProcessingAndClearingCosts" xlink:label="ATCH_DataProcessingAndClearingCosts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DataProcessingAndClearingCosts" xlink:to="ATCH_DataProcessingAndClearingCosts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DataProcessingAndClearingCosts_lbl" xml:lang="en-US">Data processing and clearing costs</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockLocateExpense" xlink:label="ATCH_StockLocateExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockLocateExpense" xlink:to="ATCH_StockLocateExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockLocateExpense_lbl" xml:lang="en-US">Stock locate expense</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_RegulatoryProfessionalFeesAndRelatedExpenses" xlink:label="ATCH_RegulatoryProfessionalFeesAndRelatedExpenses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RegulatoryProfessionalFeesAndRelatedExpenses" xlink:to="ATCH_RegulatoryProfessionalFeesAndRelatedExpenses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_RegulatoryProfessionalFeesAndRelatedExpenses_lbl" xml:lang="en-US">Regulatory, professional fees and related expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AllocatedShareBasedCompensationExpense" xlink:to="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xml:lang="en-US">Stock compensation expense</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Communication" xlink:label="us-gaap_Communication" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Communication" xlink:to="us-gaap_Communication_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Communication_lbl" xml:lang="en-US">Communications</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OccupancyNet" xlink:label="us-gaap_OccupancyNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OccupancyNet" xlink:to="us-gaap_OccupancyNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OccupancyNet_lbl" xml:lang="en-US">Occupancy and equipment</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TransferFees" xlink:label="ATCH_TransferFees" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TransferFees" xlink:to="ATCH_TransferFees_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TransferFees_lbl" xml:lang="en-US">Transfer fees</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_BankCharges" xlink:label="ATCH_BankCharges" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_BankCharges" xlink:to="ATCH_BankCharges_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_BankCharges_lbl" xml:lang="en-US">Bank charges</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="us-gaap_ProvisionForDoubtfulAccounts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProvisionForDoubtfulAccounts" xlink:to="us-gaap_ProvisionForDoubtfulAccounts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProvisionForDoubtfulAccounts_lbl" xml:lang="en-US">Bad debt</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="us-gaap_AmortizationOfIntangibleAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfIntangibleAssets" xlink:to="us-gaap_AmortizationOfIntangibleAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl" xml:lang="en-US">Intangible assets amortization</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherOperatingIncomeExpenseNet" xlink:label="us-gaap_OtherOperatingIncomeExpenseNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherOperatingIncomeExpenseNet" xlink:to="us-gaap_OtherOperatingIncomeExpenseNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_OtherOperatingIncomeExpenseNet_lbl" xml:lang="en-US">Other</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses" xlink:label="us-gaap_OperatingExpenses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingExpenses_lbl" xml:lang="en-US">TOTAL EXPENSES</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss" xlink:label="us-gaap_OperatingIncomeLoss" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingIncomeLoss" xlink:to="us-gaap_OperatingIncomeLoss_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xml:lang="en-US">LOSS FROM OPERATIONS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="us-gaap_NonoperatingIncomeExpenseAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NonoperatingIncomeExpenseAbstract" xlink:to="us-gaap_NonoperatingIncomeExpenseAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NonoperatingIncomeExpenseAbstract_lbl" xml:lang="en-US">OTHER INCOME/(EXPENSE)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="us-gaap_InvestmentIncomeInterest" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeInterest" xlink:to="us-gaap_InvestmentIncomeInterest_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIncomeInterest_lbl" xml:lang="en-US">Interest income</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAdjustmentOfWarrants" xlink:label="us-gaap_FairValueAdjustmentOfWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAdjustmentOfWarrants" xlink:to="us-gaap_FairValueAdjustmentOfWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_FairValueAdjustmentOfWarrants_lbl" xml:lang="en-US">Change in fair value of warrant liability derivative</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DerivativeGainLossOnConvertibleNoteDerivativeNet" xlink:label="ATCH_DerivativeGainLossOnConvertibleNoteDerivativeNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeGainLossOnConvertibleNoteDerivativeNet" xlink:to="ATCH_DerivativeGainLossOnConvertibleNoteDerivativeNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DerivativeGainLossOnConvertibleNoteDerivativeNet_lbl" xml:lang="en-US">Change in fair value of convertible note derivative</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet" xlink:label="ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet" xlink:to="ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet_lbl" xml:lang="en-US">Change in fair value of long-term and short-term note derivative</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueAdjustmentOfContingentGuarantee" xlink:label="ATCH_FairValueAdjustmentOfContingentGuarantee" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfContingentGuarantee" xlink:to="ATCH_FairValueAdjustmentOfContingentGuarantee_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_FairValueAdjustmentOfContingentGuarantee_lbl" xml:lang="en-US">Change in fair value of contingent guarantee</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount" xlink:label="ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount" xlink:to="ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount_lbl" xml:lang="en-US">Change in fair value of secured convertible note</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmbeddedDerivativeGainLossOnMergerFinancing" xlink:label="ATCH_EmbeddedDerivativeGainLossOnMergerFinancing" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmbeddedDerivativeGainLossOnMergerFinancing" xlink:to="ATCH_EmbeddedDerivativeGainLossOnMergerFinancing_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmbeddedDerivativeGainLossOnMergerFinancing_lbl" xml:lang="en-US">Change in fair value of merger financing</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueAdjustmentOfEarnoutLiability" xlink:label="ATCH_FairValueAdjustmentOfEarnoutLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfEarnoutLiability" xlink:to="ATCH_FairValueAdjustmentOfEarnoutLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueAdjustmentOfEarnoutLiability_lbl" xml:lang="en-US">Change in fair value of earnout liability</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueAdjustmentOfWinstonStrawnAgreement" xlink:label="ATCH_FairValueAdjustmentOfWinstonStrawnAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfWinstonStrawnAgreement" xlink:to="ATCH_FairValueAdjustmentOfWinstonStrawnAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_FairValueAdjustmentOfWinstonStrawnAgreement_lbl" xml:lang="en-US">Change in fair value of Winston &amp; Strawn agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmbeddedDerivativeGainLossOnDebenture" xlink:label="ATCH_EmbeddedDerivativeGainLossOnDebenture" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmbeddedDerivativeGainLossOnDebenture" xlink:to="ATCH_EmbeddedDerivativeGainLossOnDebenture_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmbeddedDerivativeGainLossOnDebenture_lbl" xml:lang="en-US">Change in fair value of debenture derivative</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueAdjustmentOfStockPayable" xlink:label="ATCH_FairValueAdjustmentOfStockPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfStockPayable" xlink:to="ATCH_FairValueAdjustmentOfStockPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_FairValueAdjustmentOfStockPayable_lbl" xml:lang="en-US">Change in fair value of stock payable</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount" xlink:label="ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount" xlink:to="ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount_lbl" xml:lang="en-US">Change in fair value of Tau agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_LossOnSettlementOnWinstonStrawnAgreement" xlink:label="ATCH_LossOnSettlementOnWinstonStrawnAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LossOnSettlementOnWinstonStrawnAgreement" xlink:to="ATCH_LossOnSettlementOnWinstonStrawnAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_LossOnSettlementOnWinstonStrawnAgreement_lbl" xml:lang="en-US">Loss on settlement on Winston &amp; Strawn agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating" xlink:label="us-gaap_InterestExpenseNonoperating" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpenseNonoperating" xlink:to="us-gaap_InterestExpenseNonoperating_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_InterestExpenseNonoperating_lbl" xml:lang="en-US">Interest expense</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="us-gaap_NonoperatingIncomeExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NonoperatingIncomeExpense" xlink:to="us-gaap_NonoperatingIncomeExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NonoperatingIncomeExpense_lbl" xml:lang="en-US">TOTAL OTHER INCOME/(EXPENSE)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xml:lang="en-US">NET INCOME/(LOSS) BEFORE INCOME TAXES</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="us-gaap_IncomeTaxExpenseBenefit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxExpenseBenefit" xlink:to="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xml:lang="en-US">Income tax (expense) benefit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US">NET INCOME/(LOSS)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xml:lang="en-US">Basic weighted average shares outstanding, Common Stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic" xlink:label="us-gaap_EarningsPerShareBasic" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasic" xlink:to="us-gaap_EarningsPerShareBasic_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xml:lang="en-US">Basic net income (loss) per share, Common Stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:to="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xml:lang="en-US">Diluted weighted average shares outstanding, Common Stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="us-gaap_EarningsPerShareDiluted" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareDiluted" xlink:to="us-gaap_EarningsPerShareDiluted_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xml:lang="en-US">Diluted net income (loss) per share, Common Stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US">Statement [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementLineItems_lbl" xml:lang="en-US">Statement [Line Items]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_StockholdersEquity_2_lbl" xml:lang="en-US">Balance</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_CommonStockSharesIssued_2_lbl" xml:lang="en-US">Balance, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" xlink:label="us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" xlink:to="us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_lbl" xml:lang="en-US">Shares issued as conversion in principle on convertible notes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:to="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_lbl" xml:lang="en-US">Shares issued as conversion in principle on convertible notes, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodValueIssuedForSoftwareAsServiceUnderLicenseAgreement" xlink:label="ATCH_StockIssuedDuringPeriodValueIssuedForSoftwareAsServiceUnderLicenseAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueIssuedForSoftwareAsServiceUnderLicenseAgreement" xlink:to="ATCH_StockIssuedDuringPeriodValueIssuedForSoftwareAsServiceUnderLicenseAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodValueIssuedForSoftwareAsServiceUnderLicenseAgreement_lbl" xml:lang="en-US">Shares issued under Software as a Service License Agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodShareIssuedForSoftwareAsServiceUnderLicenseAgreement" xlink:label="ATCH_StockIssuedDuringPeriodShareIssuedForSoftwareAsServiceUnderLicenseAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodShareIssuedForSoftwareAsServiceUnderLicenseAgreement" xlink:to="ATCH_StockIssuedDuringPeriodShareIssuedForSoftwareAsServiceUnderLicenseAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodShareIssuedForSoftwareAsServiceUnderLicenseAgreement_lbl" xml:lang="en-US">Shares issued under Software as a Service License Agreement, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodValueIssuedForConsultingServices" xlink:label="ATCH_StockIssuedDuringPeriodValueIssuedForConsultingServices" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueIssuedForConsultingServices" xlink:to="ATCH_StockIssuedDuringPeriodValueIssuedForConsultingServices_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodValueIssuedForConsultingServices_lbl" xml:lang="en-US">Shares issued for consulting services provided by director.</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodShareIssuedForConsultingServices" xlink:label="ATCH_StockIssuedDuringPeriodShareIssuedForConsultingServices" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodShareIssuedForConsultingServices" xlink:to="ATCH_StockIssuedDuringPeriodShareIssuedForConsultingServices_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodShareIssuedForConsultingServices_lbl" xml:lang="en-US">Shares issued for consulting services provided by director, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodValueSettledVendorObligation" xlink:label="ATCH_StockIssuedDuringPeriodValueSettledVendorObligation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueSettledVendorObligation" xlink:to="ATCH_StockIssuedDuringPeriodValueSettledVendorObligation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodValueSettledVendorObligation_lbl" xml:lang="en-US">Shares issued to settle vendor invoice</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodSharesSettledVendorObligation" xlink:label="ATCH_StockIssuedDuringPeriodSharesSettledVendorObligation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesSettledVendorObligation" xlink:to="ATCH_StockIssuedDuringPeriodSharesSettledVendorObligation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodSharesSettledVendorObligation_lbl" xml:lang="en-US">Shares issued to settled vendor invoice, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:to="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xml:lang="en-US">Vested portion of stock based compensation</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLoss_2_lbl" xml:lang="en-US">Net income (loss)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xml:lang="en-US">Shares issued under Tau agreement settled through March 31, 2025</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xml:lang="en-US">Shares issued under Tau agreement settled, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_AdjustmentsToAccumulatedDeficitReversalOfExciseTaxRelatedToPriorShareholderRedemptions" xlink:label="ATCH_AdjustmentsToAccumulatedDeficitReversalOfExciseTaxRelatedToPriorShareholderRedemptions" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AdjustmentsToAccumulatedDeficitReversalOfExciseTaxRelatedToPriorShareholderRedemptions" xlink:to="ATCH_AdjustmentsToAccumulatedDeficitReversalOfExciseTaxRelatedToPriorShareholderRedemptions_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_AdjustmentsToAccumulatedDeficitReversalOfExciseTaxRelatedToPriorShareholderRedemptions_lbl" xml:lang="en-US">Reversal of excise tax related to prior shareholder redemptions</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueOther" xlink:label="us-gaap_StockIssuedDuringPeriodValueOther" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueOther" xlink:to="us-gaap_StockIssuedDuringPeriodValueOther_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueOther_lbl" xml:lang="en-US">Shares issued to settled vendor obligations</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesOther" xlink:label="us-gaap_StockIssuedDuringPeriodSharesOther" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesOther" xlink:to="us-gaap_StockIssuedDuringPeriodSharesOther_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesOther_lbl" xml:lang="en-US">Shares issued in non-cash exercise of 2025 Warrants, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodValueToWinstonStrawnAsPartialPaymentInSettlementAgreement" xlink:label="ATCH_StockIssuedDuringPeriodValueToWinstonStrawnAsPartialPaymentInSettlementAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueToWinstonStrawnAsPartialPaymentInSettlementAgreement" xlink:to="ATCH_StockIssuedDuringPeriodValueToWinstonStrawnAsPartialPaymentInSettlementAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodValueToWinstonStrawnAsPartialPaymentInSettlementAgreement_lbl" xml:lang="en-US">Shares issued to Winston &amp; Strawn as partial payment in settlement agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodSharesToWinstonStrawnAsPartialPaymentInSettlementAgreement" xlink:label="ATCH_StockIssuedDuringPeriodSharesToWinstonStrawnAsPartialPaymentInSettlementAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesToWinstonStrawnAsPartialPaymentInSettlementAgreement" xlink:to="ATCH_StockIssuedDuringPeriodSharesToWinstonStrawnAsPartialPaymentInSettlementAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodSharesToWinstonStrawnAsPartialPaymentInSettlementAgreement_lbl" xml:lang="en-US">Shares issued to Winston &amp; Strawn as partial payment in settlement agreement, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:label="us-gaap_StockIssuedDuringPeriodValueIssuedForServices" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:to="us-gaap_StockIssuedDuringPeriodValueIssuedForServices_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueIssuedForServices_lbl" xml:lang="en-US">Common stock issued to for consulting services</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:label="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:to="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_lbl" xml:lang="en-US">Common stock issued to for consulting services, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets" xlink:label="us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets" xlink:to="us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets_lbl" xml:lang="en-US">Shares issued as purchase consideration for the assets of Pacsquare</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets" xlink:label="us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets" xlink:to="us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets_lbl" xml:lang="en-US">Shares issued as purchase consideration for the assets of Pacsquare, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockTransferredDuringPeriodByRelatedPartyValueConversionOfConvertibleSecuritiesPrincipal" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartyValueConversionOfConvertibleSecuritiesPrincipal" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockTransferredDuringPeriodByRelatedPartyValueConversionOfConvertibleSecuritiesPrincipal" xlink:to="ATCH_StockTransferredDuringPeriodByRelatedPartyValueConversionOfConvertibleSecuritiesPrincipal_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartyValueConversionOfConvertibleSecuritiesPrincipal_lbl" xml:lang="en-US">Shares transferred by related parties as settlement for Company obligations under various financial instruments see Note 9</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodValueSettlementOfDues" xlink:label="ATCH_StockIssuedDuringPeriodValueSettlementOfDues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueSettlementOfDues" xlink:to="ATCH_StockIssuedDuringPeriodValueSettlementOfDues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodValueSettlementOfDues_lbl" xml:lang="en-US">Shares issued to related party as settlement for $803,860 in related party payable.</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodSharesSettlementOfDues" xlink:label="ATCH_StockIssuedDuringPeriodSharesSettlementOfDues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesSettlementOfDues" xlink:to="ATCH_StockIssuedDuringPeriodSharesSettlementOfDues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodSharesSettlementOfDues_lbl" xml:lang="en-US">Shares issued to related party as settlement for related party payable., shares</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodValueDelayedPaymentsOfDebt" xlink:label="ATCH_StockIssuedDuringPeriodValueDelayedPaymentsOfDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueDelayedPaymentsOfDebt" xlink:to="ATCH_StockIssuedDuringPeriodValueDelayedPaymentsOfDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodValueDelayedPaymentsOfDebt_lbl" xml:lang="en-US">Shares issued to as additional consideration for delayed payment on merger financing notes</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodSharesDelayedPaymentsOfDebt" xlink:label="ATCH_StockIssuedDuringPeriodSharesDelayedPaymentsOfDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesDelayedPaymentsOfDebt" xlink:to="ATCH_StockIssuedDuringPeriodSharesDelayedPaymentsOfDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodSharesDelayedPaymentsOfDebt_lbl" xml:lang="en-US">Shares issued to as additional consideration for delayed payment on merger financing notes, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodValueCompanyObligationsNetOfContributedCapitalForDebtAssumed" xlink:label="ATCH_StockIssuedDuringPeriodValueCompanyObligationsNetOfContributedCapitalForDebtAssumed" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueCompanyObligationsNetOfContributedCapitalForDebtAssumed" xlink:to="ATCH_StockIssuedDuringPeriodValueCompanyObligationsNetOfContributedCapitalForDebtAssumed_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodValueCompanyObligationsNetOfContributedCapitalForDebtAssumed_lbl" xml:lang="en-US">Shares issued for shares transferred by related party as repayment of shares transferred to cover Company obligations as noted above net of contributed capital for debt assumed (see Note 9)</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodSharesCompanyObligationsNetOfContributedCapitalForDebtAssumed" xlink:label="ATCH_StockIssuedDuringPeriodSharesCompanyObligationsNetOfContributedCapitalForDebtAssumed" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesCompanyObligationsNetOfContributedCapitalForDebtAssumed" xlink:to="ATCH_StockIssuedDuringPeriodSharesCompanyObligationsNetOfContributedCapitalForDebtAssumed_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodSharesCompanyObligationsNetOfContributedCapitalForDebtAssumed_lbl" xml:lang="en-US">Shares issued for shares transferred by related party as repayment of shares transferred to cover Company obligations as noted above net of contributed capital for debt assumed, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodValueReverseStockSplits" xlink:label="ATCH_StockIssuedDuringPeriodValueReverseStockSplits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueReverseStockSplits" xlink:to="ATCH_StockIssuedDuringPeriodValueReverseStockSplits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodValueReverseStockSplits_lbl" xml:lang="en-US">Rounding up for fractional shares in 1:60 reverse stock split</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits" xlink:label="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits" xlink:to="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits_lbl" xml:lang="en-US">Rounding up for fractional shares in 1:60 reverse stock split, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:label="us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:to="us-gaap_StockIssuedDuringPeriodValueConversionOfUnits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueConversionOfUnits_lbl" xml:lang="en-US">Shares issued as conversion of $0.5 million in principal and interest on secured convertible notes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:to="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_lbl" xml:lang="en-US">Stock issued during the period, shares convrsion of units</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments" xlink:to="ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments_lbl" xml:lang="en-US">Shares transferred by related parties as settlement for Company obligations under various financial instruments see Note 9</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockTransferredDuringPeriodByRelatedPartySharesAsSettlementForCompanyObligationsUnderVariousFinancialInstruments" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartySharesAsSettlementForCompanyObligationsUnderVariousFinancialInstruments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockTransferredDuringPeriodByRelatedPartySharesAsSettlementForCompanyObligationsUnderVariousFinancialInstruments" xlink:to="ATCH_StockTransferredDuringPeriodByRelatedPartySharesAsSettlementForCompanyObligationsUnderVariousFinancialInstruments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartySharesAsSettlementForCompanyObligationsUnderVariousFinancialInstruments_lbl" xml:lang="en-US">Shares transferred by related parties as settlement for Company obligations under various financial instruments, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:to="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueAcquisitions_lbl" xml:lang="en-US">Shares issued as deposit for purchase of the Commercial Bank acquisition</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:to="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesAcquisitions_lbl" xml:lang="en-US">Stock issued during period, shares acquisitions</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringThePeriodValueCommitmentFeeSharesSettledUnderTauAgreement" xlink:label="ATCH_StockIssuedDuringThePeriodValueCommitmentFeeSharesSettledUnderTauAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringThePeriodValueCommitmentFeeSharesSettledUnderTauAgreement" xlink:to="ATCH_StockIssuedDuringThePeriodValueCommitmentFeeSharesSettledUnderTauAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringThePeriodValueCommitmentFeeSharesSettledUnderTauAgreement_lbl" xml:lang="en-US">Commitment fee shares settled under the Tau agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringThePeriodSharesCommitmentFeeSharesSettledUnderTauAgreement" xlink:label="ATCH_StockIssuedDuringThePeriodSharesCommitmentFeeSharesSettledUnderTauAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringThePeriodSharesCommitmentFeeSharesSettledUnderTauAgreement" xlink:to="ATCH_StockIssuedDuringThePeriodSharesCommitmentFeeSharesSettledUnderTauAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringThePeriodSharesCommitmentFeeSharesSettledUnderTauAgreement_lbl" xml:lang="en-US">Commitment fee shares settled under the Tau agreement, shares</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_StockholdersEquity_3_lbl" xml:lang="en-US">Balance</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_CommonStockSharesIssued_3_lbl" xml:lang="en-US">Balance, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtConversionOriginalDebtAmount1" xlink:label="us-gaap_DebtConversionOriginalDebtAmount1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtConversionOriginalDebtAmount1" xlink:to="us-gaap_DebtConversionOriginalDebtAmount1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtConversionOriginalDebtAmount1_lbl" xml:lang="en-US">Conversion amount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtConversionOriginalDebtPrincipalAmount" xlink:label="ATCH_DebtConversionOriginalDebtPrincipalAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionOriginalDebtPrincipalAmount" xlink:to="ATCH_DebtConversionOriginalDebtPrincipalAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_DebtConversionOriginalDebtPrincipalAmount_lbl" xml:lang="en-US">Conversion amount</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpenseOfferingCost" xlink:label="us-gaap_NoninterestExpenseOfferingCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NoninterestExpenseOfferingCost" xlink:to="us-gaap_NoninterestExpenseOfferingCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NoninterestExpenseOfferingCost_lbl" xml:lang="en-US">Net of offering cost</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtConversionOriginalDebtInterestAmount" xlink:label="ATCH_DebtConversionOriginalDebtInterestAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionOriginalDebtInterestAmount" xlink:to="ATCH_DebtConversionOriginalDebtInterestAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtConversionOriginalDebtInterestAmount_lbl" xml:lang="en-US">Interest amount</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent" xlink:label="us-gaap_AccountsPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountsPayableCurrent" xlink:to="us-gaap_AccountsPayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xml:lang="en-US">Settlement for related party payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityReverseStockSplit" xlink:label="us-gaap_StockholdersEquityReverseStockSplit" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityReverseStockSplit" xlink:to="us-gaap_StockholdersEquityReverseStockSplit_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityReverseStockSplit_lbl" xml:lang="en-US">Reverse stock split</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetAcquisitionTable" xlink:label="us-gaap_AssetAcquisitionTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetAcquisitionTable" xlink:to="us-gaap_AssetAcquisitionTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetAcquisitionTable_lbl" xml:lang="en-US">Asset Acquisition [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetAcquisitionLineItems" xlink:label="us-gaap_AssetAcquisitionLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetAcquisitionLineItems" xlink:to="us-gaap_AssetAcquisitionLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetAcquisitionLineItems_lbl" xml:lang="en-US">Asset Acquisition [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US">Cash Flows from Operating Activities:</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_NetIncomeLoss_3_lbl" xml:lang="en-US">Net income</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US">Adjustments to reconcile net income to net cash provided by (used for) operating activities:</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAdjustmentOfWarrants" xlink:to="us-gaap_FairValueAdjustmentOfWarrants_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAdjustmentOfWarrants_2_lbl" xml:lang="en-US">Change in fair value of warrant liability derivative</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet" xlink:label="ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet" xlink:to="ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet_lbl" xml:lang="en-US">Change in fair value of convertible note derivative</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet" xlink:to="ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet_2_lbl" xml:lang="en-US">Change in fair value of long-term and short-term note derivative</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfContingentGuarantee" xlink:to="ATCH_FairValueAdjustmentOfContingentGuarantee_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueAdjustmentOfContingentGuarantee_2_lbl" xml:lang="en-US">Change in fair value of contingent guarantee</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmbeddedDerivativeGainLossOnDebenture" xlink:to="ATCH_EmbeddedDerivativeGainLossOnDebenture_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_EmbeddedDerivativeGainLossOnDebenture_2_lbl" xml:lang="en-US">Change in fair value of debenture derivative</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount" xlink:to="ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount_2_lbl" xml:lang="en-US">Change in fair value of secured convertible note</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmbeddedDerivativeGainLossOnMergerFinancing" xlink:to="ATCH_EmbeddedDerivativeGainLossOnMergerFinancing_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_EmbeddedDerivativeGainLossOnMergerFinancing_2_lbl" xml:lang="en-US">Change in fair value of merger financing</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfEarnoutLiability" xlink:to="ATCH_FairValueAdjustmentOfEarnoutLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_FairValueAdjustmentOfEarnoutLiability_2_lbl" xml:lang="en-US">Change in fair value of earnout liability</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ChangeInFairValueOfWinstonStrawnAgreement" xlink:label="ATCH_ChangeInFairValueOfWinstonStrawnAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ChangeInFairValueOfWinstonStrawnAgreement" xlink:to="ATCH_ChangeInFairValueOfWinstonStrawnAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_ChangeInFairValueOfWinstonStrawnAgreement_lbl" xml:lang="en-US">Change in fair value of Winston &amp; Strawn agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueAdjustmentOfStockPayables" xlink:label="ATCH_FairValueAdjustmentOfStockPayables" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfStockPayables" xlink:to="ATCH_FairValueAdjustmentOfStockPayables_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_FairValueAdjustmentOfStockPayables_lbl" xml:lang="en-US">Change in fair value of stock payable</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount" xlink:to="ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount_2_lbl" xml:lang="en-US">Change in fair value of Tau agreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LossOnSettlementOnWinstonStrawnAgreement" xlink:to="ATCH_LossOnSettlementOnWinstonStrawnAgreement_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_LossOnSettlementOnWinstonStrawnAgreement_2_lbl" xml:lang="en-US">Loss on settlement on Winston &amp; Strawn agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PaidInKindLateFeesToSellers" xlink:label="ATCH_PaidInKindLateFeesToSellers" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PaidInKindLateFeesToSellers" xlink:to="ATCH_PaidInKindLateFeesToSellers_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PaidInKindLateFeesToSellers_lbl" xml:lang="en-US">Late fee paid in shares to sellers</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_InterestExpenseFinancialInstruments" xlink:label="ATCH_InterestExpenseFinancialInstruments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InterestExpenseFinancialInstruments" xlink:to="ATCH_InterestExpenseFinancialInstruments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_InterestExpenseFinancialInstruments_lbl" xml:lang="en-US">Non-cash interest in expense on financial instruments</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TransactionCostAttributedToWarrants" xlink:label="ATCH_TransactionCostAttributedToWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TransactionCostAttributedToWarrants" xlink:to="ATCH_TransactionCostAttributedToWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TransactionCostAttributedToWarrants_lbl" xml:lang="en-US">Transaction cost attributed to 2025 warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_RealizedGainLossOnSaleOfSharesUnderSharePurchaseCommitment" xlink:label="ATCH_RealizedGainLossOnSaleOfSharesUnderSharePurchaseCommitment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RealizedGainLossOnSaleOfSharesUnderSharePurchaseCommitment" xlink:to="ATCH_RealizedGainLossOnSaleOfSharesUnderSharePurchaseCommitment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_RealizedGainLossOnSaleOfSharesUnderSharePurchaseCommitment_lbl" xml:lang="en-US">Realized gain on Tau agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CommissionOnTauAgreement" xlink:label="ATCH_CommissionOnTauAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommissionOnTauAgreement" xlink:to="ATCH_CommissionOnTauAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_CommissionOnTauAgreement_lbl" xml:lang="en-US">Commission on Tau agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ExciseTaxPenaltiesAndInterest" xlink:label="ATCH_ExciseTaxPenaltiesAndInterest" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ExciseTaxPenaltiesAndInterest" xlink:to="ATCH_ExciseTaxPenaltiesAndInterest_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ExciseTaxPenaltiesAndInterest_lbl" xml:lang="en-US">Excise tax penalties and interest</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockBasedConsultingExpense" xlink:label="ATCH_StockBasedConsultingExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockBasedConsultingExpense" xlink:to="ATCH_StockBasedConsultingExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockBasedConsultingExpense_lbl" xml:lang="en-US">Consulting expense paid with stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation" xlink:label="us-gaap_ShareBasedCompensation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensation" xlink:to="us-gaap_ShareBasedCompensation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensation_lbl" xml:lang="en-US">Stock based compensation</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_BankAcquisitionDepositWriteOff" xlink:label="ATCH_BankAcquisitionDepositWriteOff" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_BankAcquisitionDepositWriteOff" xlink:to="ATCH_BankAcquisitionDepositWriteOff_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_BankAcquisitionDepositWriteOff_lbl" xml:lang="en-US">Bank acquisition deposit write off</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Depreciation" xlink:label="us-gaap_Depreciation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Depreciation" xlink:to="us-gaap_Depreciation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Depreciation_lbl" xml:lang="en-US">Depreciation expense</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfIntangibleAssets" xlink:to="us-gaap_AmortizationOfIntangibleAssets_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_AmortizationOfIntangibleAssets_2_lbl" xml:lang="en-US">Amortization of intangibles</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProvisionForDoubtfulAccounts" xlink:to="us-gaap_ProvisionForDoubtfulAccounts_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ProvisionForDoubtfulAccounts_2_lbl" xml:lang="en-US">Allowance for bad debt</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_NetOperatingLeasePayments" xlink:label="ATCH_NetOperatingLeasePayments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_NetOperatingLeasePayments" xlink:to="ATCH_NetOperatingLeasePayments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_NetOperatingLeasePayments_lbl" xml:lang="en-US">Net lease payments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xml:lang="en-US">Changes in operating assets and liabilities:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInDepositOtherAssets" xlink:label="us-gaap_IncreaseDecreaseInDepositOtherAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInDepositOtherAssets" xlink:to="us-gaap_IncreaseDecreaseInDepositOtherAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInDepositOtherAssets_lbl" xml:lang="en-US">Cash deposits with clearing organization &amp; other B/Ds</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInBrokerageReceivables" xlink:label="us-gaap_IncreaseDecreaseInBrokerageReceivables" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInBrokerageReceivables" xlink:to="us-gaap_IncreaseDecreaseInBrokerageReceivables_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInBrokerageReceivables_lbl" xml:lang="en-US">Receivables from brokers &amp; dealers</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:to="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xml:lang="en-US">Receivables from customers</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherReceivables" xlink:label="us-gaap_IncreaseDecreaseInOtherReceivables" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOtherReceivables" xlink:to="us-gaap_IncreaseDecreaseInOtherReceivables_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInOtherReceivables_lbl" xml:lang="en-US">Receivables from others</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPrepaidExpense" xlink:label="us-gaap_IncreaseDecreaseInPrepaidExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInPrepaidExpense" xlink:to="us-gaap_IncreaseDecreaseInPrepaidExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInPrepaidExpense_lbl" xml:lang="en-US">Advances &amp; prepaid expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:to="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingAssets_lbl" xml:lang="en-US">Other assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPayablesToCustomers" xlink:label="us-gaap_IncreaseDecreaseInPayablesToCustomers" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInPayablesToCustomers" xlink:to="us-gaap_IncreaseDecreaseInPayablesToCustomers_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IncreaseDecreaseInPayablesToCustomers_lbl" xml:lang="en-US">Payables to customers</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInDueToRelatedParties" xlink:label="us-gaap_IncreaseDecreaseInDueToRelatedParties" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInDueToRelatedParties" xlink:to="us-gaap_IncreaseDecreaseInDueToRelatedParties_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInDueToRelatedParties_lbl" xml:lang="en-US">Payables to officers &amp; directors</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPayablesToBrokerDealers" xlink:label="us-gaap_IncreaseDecreaseInPayablesToBrokerDealers" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInPayablesToBrokerDealers" xlink:to="us-gaap_IncreaseDecreaseInPayablesToBrokerDealers_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInPayablesToBrokerDealers_lbl" xml:lang="en-US">Payable to brokers &amp; dealers</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_lbl" xml:lang="en-US">Accounts payable and accrued expenses</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_IncreaseDecreaseInCommissionsAndPayrollTaxesPayable" xlink:label="ATCH_IncreaseDecreaseInCommissionsAndPayrollTaxesPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_IncreaseDecreaseInCommissionsAndPayrollTaxesPayable" xlink:to="ATCH_IncreaseDecreaseInCommissionsAndPayrollTaxesPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_IncreaseDecreaseInCommissionsAndPayrollTaxesPayable_lbl" xml:lang="en-US">Commissions and payroll taxes payable</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInDeferredIncomeTaxes" xlink:label="us-gaap_IncreaseDecreaseInDeferredIncomeTaxes" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInDeferredIncomeTaxes" xlink:to="us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_lbl" xml:lang="en-US">Deferred taxes</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_IncreaseDecreaseInTradingDeposits" xlink:label="ATCH_IncreaseDecreaseInTradingDeposits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_IncreaseDecreaseInTradingDeposits" xlink:to="ATCH_IncreaseDecreaseInTradingDeposits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_IncreaseDecreaseInTradingDeposits_lbl" xml:lang="en-US">Trading deposits</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xml:lang="en-US">Net cash used for operating activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xml:lang="en-US">Cash Flows from Investing Activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireOtherInvestments" xlink:label="us-gaap_PaymentsToAcquireOtherInvestments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsToAcquireOtherInvestments" xlink:to="us-gaap_PaymentsToAcquireOtherInvestments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsToAcquireOtherInvestments_lbl" xml:lang="en-US">Cash paid for purchase of Pacsquare</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherPaymentsToAcquireBusinesses" xlink:label="us-gaap_OtherPaymentsToAcquireBusinesses" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherPaymentsToAcquireBusinesses" xlink:to="us-gaap_OtherPaymentsToAcquireBusinesses_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_OtherPaymentsToAcquireBusinesses_lbl" xml:lang="en-US">Cash paid for bank acquisition deposit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xml:lang="en-US">Net cash used for investing activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US">Cash Flows from Financing Activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity" xlink:label="us-gaap_ProceedsFromIssuanceOrSaleOfEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOrSaleOfEquity" xlink:to="us-gaap_ProceedsFromIssuanceOrSaleOfEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOrSaleOfEquity_lbl" xml:lang="en-US">Proceeds from Equity SPA</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xlink:label="us-gaap_PaymentOfFinancingAndStockIssuanceCosts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xlink:to="us-gaap_PaymentOfFinancingAndStockIssuanceCosts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentOfFinancingAndStockIssuanceCosts_lbl" xml:lang="en-US">Transaction cost paid with Equity SPA</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSecuredNotesPayable" xlink:label="us-gaap_ProceedsFromSecuredNotesPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromSecuredNotesPayable" xlink:to="us-gaap_ProceedsFromSecuredNotesPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromSecuredNotesPayable_lbl" xml:lang="en-US">Proceeds from Secured Convertible Notes</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_RepaymentsOfSecurityConvertibleNotes" xlink:label="ATCH_RepaymentsOfSecurityConvertibleNotes" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RepaymentsOfSecurityConvertibleNotes" xlink:to="ATCH_RepaymentsOfSecurityConvertibleNotes_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_RepaymentsOfSecurityConvertibleNotes_lbl" xml:lang="en-US">Transaction cost paid with Security Convertible Notes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xml:lang="en-US">Proceeds from Tau agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromConvertibleDebt" xlink:label="us-gaap_ProceedsFromConvertibleDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromConvertibleDebt" xlink:to="us-gaap_ProceedsFromConvertibleDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromConvertibleDebt_lbl" xml:lang="en-US">Proceeds from Convertible Notes, net of transaction cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfConvertibleDebt" xlink:label="us-gaap_RepaymentsOfConvertibleDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfConvertibleDebt" xlink:to="us-gaap_RepaymentsOfConvertibleDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_RepaymentsOfConvertibleDebt_lbl" xml:lang="en-US">Payment on Convertible Notes</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ProceedsFromIssuanceOfDebenture" xlink:label="ATCH_ProceedsFromIssuanceOfDebenture" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ProceedsFromIssuanceOfDebenture" xlink:to="ATCH_ProceedsFromIssuanceOfDebenture_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ProceedsFromIssuanceOfDebenture_lbl" xml:lang="en-US">Proceeds from debenture, net of transaction cost</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ProceedsFromNonInterestBearingAdvances" xlink:label="ATCH_ProceedsFromNonInterestBearingAdvances" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ProceedsFromNonInterestBearingAdvances" xlink:to="ATCH_ProceedsFromNonInterestBearingAdvances_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ProceedsFromNonInterestBearingAdvances_lbl" xml:lang="en-US">Proceeds from third party advances</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="us-gaap_PaymentsOfDebtIssuanceCosts" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsOfDebtIssuanceCosts" xlink:to="us-gaap_PaymentsOfDebtIssuanceCosts_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsOfDebtIssuanceCosts_lbl" xml:lang="en-US">Subordinated debt payments</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PaymentOnWinstonStrawnSettlementAgreement" xlink:label="ATCH_PaymentOnWinstonStrawnSettlementAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PaymentOnWinstonStrawnSettlementAgreement" xlink:to="ATCH_PaymentOnWinstonStrawnSettlementAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="ATCH_PaymentOnWinstonStrawnSettlementAgreement_lbl" xml:lang="en-US">Payment on Winston &amp; Strawn settlement agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfNotesPayable" xlink:label="us-gaap_RepaymentsOfNotesPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfNotesPayable" xlink:to="us-gaap_RepaymentsOfNotesPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_RepaymentsOfNotesPayable_lbl" xml:lang="en-US">Repayment of promissory notes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xml:lang="en-US">Net cash provided by financing activities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl" xml:lang="en-US">Net Change in Cash</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US">Cash at beginning of period</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_2_lbl" xml:lang="en-US">Cash at end of period</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalCashFlowElementsAbstract" xlink:label="us-gaap_SupplementalCashFlowElementsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SupplementalCashFlowElementsAbstract" xlink:to="us-gaap_SupplementalCashFlowElementsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SupplementalCashFlowElementsAbstract_lbl" xml:lang="en-US">Supplementary cash flow information:</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPaidNet" xlink:label="us-gaap_InterestPaidNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestPaidNet" xlink:to="us-gaap_InterestPaidNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestPaidNet_lbl" xml:lang="en-US">Cash paid for interest</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="us-gaap_IncomeTaxesPaidNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxesPaidNet" xlink:to="us-gaap_IncomeTaxesPaidNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxesPaidNet_lbl" xml:lang="en-US">Cash paid for income taxes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncashInvestingAndFinancingItemsAbstract" xlink:label="us-gaap_NoncashInvestingAndFinancingItemsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NoncashInvestingAndFinancingItemsAbstract" xlink:to="us-gaap_NoncashInvestingAndFinancingItemsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NoncashInvestingAndFinancingItemsAbstract_lbl" xml:lang="en-US">Supplemental cash flow information non-cash investing and financing activities:</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_NoncashOrPartOfNoncashChangesInGoodwillDueToChangeInDeferredTaxLiability" xlink:label="ATCH_NoncashOrPartOfNoncashChangesInGoodwillDueToChangeInDeferredTaxLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_NoncashOrPartOfNoncashChangesInGoodwillDueToChangeInDeferredTaxLiability" xlink:to="ATCH_NoncashOrPartOfNoncashChangesInGoodwillDueToChangeInDeferredTaxLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_NoncashOrPartOfNoncashChangesInGoodwillDueToChangeInDeferredTaxLiability_lbl" xml:lang="en-US">Decrease in goodwill due to change in deferred tax liability</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_InitialSharesIssuedValuePurchaseCommitmentAmount" xlink:label="ATCH_InitialSharesIssuedValuePurchaseCommitmentAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialSharesIssuedValuePurchaseCommitmentAmount" xlink:to="ATCH_InitialSharesIssuedValuePurchaseCommitmentAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_InitialSharesIssuedValuePurchaseCommitmentAmount_lbl" xml:lang="en-US">Initial shares issued under Tau agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ValueOfSharesTransferredByRelatedPartiesToSettleObligations" xlink:label="ATCH_ValueOfSharesTransferredByRelatedPartiesToSettleObligations" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ValueOfSharesTransferredByRelatedPartiesToSettleObligations" xlink:to="ATCH_ValueOfSharesTransferredByRelatedPartiesToSettleObligations_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ValueOfSharesTransferredByRelatedPartiesToSettleObligations_lbl" xml:lang="en-US">Value of shares transferred by related parties to settle obligations</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedSettlementOfAccountsPayableToRelatedParty" xlink:label="ATCH_StockIssuedSettlementOfAccountsPayableToRelatedParty" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedSettlementOfAccountsPayableToRelatedParty" xlink:to="ATCH_StockIssuedSettlementOfAccountsPayableToRelatedParty_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedSettlementOfAccountsPayableToRelatedParty_lbl" xml:lang="en-US">Shares issued to related party for settlement of accounts payable</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ReceivableFromSharesAdvancedUnderSharePurchaseCommitment" xlink:label="ATCH_ReceivableFromSharesAdvancedUnderSharePurchaseCommitment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ReceivableFromSharesAdvancedUnderSharePurchaseCommitment" xlink:to="ATCH_ReceivableFromSharesAdvancedUnderSharePurchaseCommitment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ReceivableFromSharesAdvancedUnderSharePurchaseCommitment_lbl" xml:lang="en-US">Receivable from shares advanced under Tau agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SharesIssuedForCommercialBancorpAcquisitionExtension" xlink:label="ATCH_SharesIssuedForCommercialBancorpAcquisitionExtension" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesIssuedForCommercialBancorpAcquisitionExtension" xlink:to="ATCH_SharesIssuedForCommercialBancorpAcquisitionExtension_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SharesIssuedForCommercialBancorpAcquisitionExtension_lbl" xml:lang="en-US">Shares issued for Commercial Bancorp acquisition extension</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:label="us-gaap_DebtConversionConvertedInstrumentAmount1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:to="us-gaap_DebtConversionConvertedInstrumentAmount1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtConversionConvertedInstrumentAmount1_lbl" xml:lang="en-US">Initial value of derivative included debenture derivative</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SharesIssuedForConversionOfPrincipalAndInterestOnLongtermNote" xlink:label="ATCH_SharesIssuedForConversionOfPrincipalAndInterestOnLongtermNote" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesIssuedForConversionOfPrincipalAndInterestOnLongtermNote" xlink:to="ATCH_SharesIssuedForConversionOfPrincipalAndInterestOnLongtermNote_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SharesIssuedForConversionOfPrincipalAndInterestOnLongtermNote_lbl" xml:lang="en-US">Shares issued for conversion of principal and interest on long-term note</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SharesIssuedForStockPayable" xlink:label="ATCH_SharesIssuedForStockPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesIssuedForStockPayable" xlink:to="ATCH_SharesIssuedForStockPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SharesIssuedForStockPayable_lbl" xml:lang="en-US">Shares issued for stock payable</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_InitialValueOfDerivativeIncludedInMergerFinancing" xlink:label="ATCH_InitialValueOfDerivativeIncludedInMergerFinancing" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialValueOfDerivativeIncludedInMergerFinancing" xlink:to="ATCH_InitialValueOfDerivativeIncludedInMergerFinancing_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_InitialValueOfDerivativeIncludedInMergerFinancing_lbl" xml:lang="en-US">Initial value of derivative included in merger financing</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PromissoryNoteIssuedUnderInsurancePremium" xlink:label="ATCH_PromissoryNoteIssuedUnderInsurancePremium" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PromissoryNoteIssuedUnderInsurancePremium" xlink:to="ATCH_PromissoryNoteIssuedUnderInsurancePremium_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PromissoryNoteIssuedUnderInsurancePremium_lbl" xml:lang="en-US">Promissory note issued under insurance premium</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ReversalOfExciseTax" xlink:label="ATCH_ReversalOfExciseTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ReversalOfExciseTax" xlink:to="ATCH_ReversalOfExciseTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ReversalOfExciseTax_lbl" xml:lang="en-US">Reversal of excise tax</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ConvertibleNotesTransferredToEquitySpa" xlink:label="ATCH_ConvertibleNotesTransferredToEquitySpa" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNotesTransferredToEquitySpa" xlink:to="ATCH_ConvertibleNotesTransferredToEquitySpa_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ConvertibleNotesTransferredToEquitySpa_lbl" xml:lang="en-US">Convertible Notes transferred to Equity SPA</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_InitialValueOfWarrantsAllocatedForEquitySPA" xlink:label="ATCH_InitialValueOfWarrantsAllocatedForEquitySPA" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialValueOfWarrantsAllocatedForEquitySPA" xlink:to="ATCH_InitialValueOfWarrantsAllocatedForEquitySPA_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_InitialValueOfWarrantsAllocatedForEquitySPA_lbl" xml:lang="en-US">Initial value of warrants allocated for Equity SPA</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity" xlink:label="ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity" xlink:to="ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity_lbl" xml:lang="en-US">Initial value of warrant issued as transaction cost under Equity SPA</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SharesIssuedForWinstonStrawnSettlementAgreement" xlink:label="ATCH_SharesIssuedForWinstonStrawnSettlementAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesIssuedForWinstonStrawnSettlementAgreement" xlink:to="ATCH_SharesIssuedForWinstonStrawnSettlementAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SharesIssuedForWinstonStrawnSettlementAgreement_lbl" xml:lang="en-US">Shares issued for Winston &amp; Strawn settlement agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SharesIssuedForNoncashExerciseOf2025Warrants" xlink:label="ATCH_SharesIssuedForNoncashExerciseOf2025Warrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesIssuedForNoncashExerciseOf2025Warrants" xlink:to="ATCH_SharesIssuedForNoncashExerciseOf2025Warrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SharesIssuedForNoncashExerciseOf2025Warrants_lbl" xml:lang="en-US">Shares issued for non-cash exercise of 2025 Warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities" xlink:label="ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities" xlink:to="ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities_lbl" xml:lang="en-US">Right-of-use assets obtained in exchange for new operating lease liabilities</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:to="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:to="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xml:lang="en-US">DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="us-gaap_AccountingPoliciesAbstract" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_AccountingPoliciesAbstract_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativesReportingOfDerivativeActivity" xlink:label="us-gaap_DerivativesReportingOfDerivativeActivity" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LesseeLeasesPolicyTextBlock" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LesseeLeasesPolicyTextBlock" xlink:to="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xml:lang="en-US">Leases</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xml:lang="en-US">Recent Accounting Standards</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF BASIC AND DILUTED NET INCOME (LOSS) PER SHARE OF COMMON STOCK</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xml:lang="en-US">SCHEDULE OF DILUTIVE INSTRUMENTS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock" xlink:label="us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF RECONCILIATION OF CASH AND RESTRICTED CASH AS SHOWN IN THE STATEMENTS OF CASH FLOWS</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_LesseeOperatingLeasesOtherInformationTableTextBlock" xlink:label="ATCH_LesseeOperatingLeasesOtherInformationTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LesseeOperatingLeasesOtherInformationTableTextBlock" xlink:to="ATCH_LesseeOperatingLeasesOtherInformationTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_LesseeOperatingLeasesOtherInformationTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF OTHER INFORMATION RELATED TO THE COMPANY'S OPERATING LEASES</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDebtTableTextBlock" xlink:label="us-gaap_ScheduleOfDebtTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfDebtTableTextBlock" xlink:to="us-gaap_ScheduleOfDebtTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfDebtTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF NOTES PAYABLE AND RELATED FINANCING</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTableTextBlock" xlink:label="us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTableTextBlock" xlink:to="us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF INTANGIBLE ASSETS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock" xlink:label="us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock" xlink:to="us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF AMORTIZATION OF INTANGIBLE ASSETS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock" xlink:label="us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock" xlink:to="us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF NONVESTED STOCK AWARDS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationPerformanceSharesAwardUnvestedActivityTableTextBlock" xlink:label="us-gaap_ShareBasedCompensationPerformanceSharesAwardUnvestedActivityTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationPerformanceSharesAwardUnvestedActivityTableTextBlock" xlink:to="us-gaap_ShareBasedCompensationPerformanceSharesAwardUnvestedActivityTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationPerformanceSharesAwardUnvestedActivityTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF PERFORMANCE-BASED (MARKET CONDITION) AWARDS BY TRANCHE</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ScheduleOfShareBasedPaymentAwardPerformanceSharesValuationAssumptionsTableTextBlock" xlink:label="ATCH_ScheduleOfShareBasedPaymentAwardPerformanceSharesValuationAssumptionsTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ScheduleOfShareBasedPaymentAwardPerformanceSharesValuationAssumptionsTableTextBlock" xlink:to="ATCH_ScheduleOfShareBasedPaymentAwardPerformanceSharesValuationAssumptionsTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ScheduleOfShareBasedPaymentAwardPerformanceSharesValuationAssumptionsTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF KEY ASSUMPTIONS USED IN THE VALUATION OF PERFORMANCE-BASED STOCK AWARDS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:to="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xml:lang="en-US">SCHEDULE OF STOCK-BASED COMPENSATION EXPENSE</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:to="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF FAIR VALUE HIERARCHY OF THE VALUATION INPUTS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock_lbl" xml:lang="en-US">SCHEDULE OF FAIR VALUE MEASUREMENT INPUTS AND VALUATION</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:to="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_lbl" xml:lang="en-US">SCHEDULE OF CHANGES IN THE FAIR VALUE</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xml:lang="en-US">SCHEDULE OF REVENUE AND OPERATING INCOME LOSS</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromNotesPayable" xlink:label="us-gaap_ProceedsFromNotesPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromNotesPayable" xlink:to="us-gaap_ProceedsFromNotesPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromNotesPayable_lbl" xml:lang="en-US">Purchase price of notes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="us-gaap_DebtInstrumentFaceAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentFaceAmount" xlink:to="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:type="arc" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xml:lang="en-US">Interest rate</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_NumberOfSharesPerUnitIssued" xlink:label="ATCH_NumberOfSharesPerUnitIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_NumberOfSharesPerUnitIssued" xlink:to="ATCH_NumberOfSharesPerUnitIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_NumberOfSharesPerUnitIssued_lbl" xml:lang="en-US">Number of shares per unit issued</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_NumberOfWarrantsPerUnitIssued" xlink:label="ATCH_NumberOfWarrantsPerUnitIssued" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_NumberOfWarrantsPerUnitIssued_lbl" xml:lang="en-US">Number of warrants per unit issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xml:lang="en-US">Exercise price of warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_UnitsIssuedProceeds" xlink:label="ATCH_UnitsIssuedProceeds" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_UnitsIssuedProceeds_lbl" xml:lang="en-US">Aggregate sale price</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:to="us-gaap_DebtConversionConvertedInstrumentAmount1_2_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_GrossProceedsFromIssuanceOfDebtAndUnits" xlink:to="ATCH_GrossProceedsFromIssuanceOfDebtAndUnits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_GrossProceedsFromIssuanceOfDebtAndUnits_lbl" xml:lang="en-US">Gross proceeds from issuance of debt</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_2_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasic" xlink:to="us-gaap_EarningsPerShareBasic_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_EarningsPerShareBasic_2_lbl" xml:lang="en-US">Net loss per common stock, basic</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareDiluted" xlink:to="us-gaap_EarningsPerShareDiluted_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_EarningsPerShareDiluted_2_lbl" xml:lang="en-US">Diluted net income per Common Stock</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueAdjustmentOfFinancialInstrumentsNetOfTax" xlink:label="ATCH_FairValueAdjustmentOfFinancialInstrumentsNetOfTax" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfFinancialInstrumentsNetOfTax" xlink:to="ATCH_FairValueAdjustmentOfFinancialInstrumentsNetOfTax_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueAdjustmentOfFinancialInstrumentsNetOfTax_lbl" xml:lang="en-US">Change in fair value of financial instruments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DilutiveSecurities" xlink:label="us-gaap_DilutiveSecurities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DilutiveSecurities" xlink:to="us-gaap_DilutiveSecurities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DilutiveSecurities_lbl" xml:lang="en-US">Interest on dilutive instruments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" xlink:to="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_lbl" xml:lang="en-US">Allocation of net income, as adjusted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities" xlink:label="us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities" xlink:to="us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities_lbl" xml:lang="en-US">If converted shares</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities" xlink:to="us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities_2_lbl" xml:lang="en-US">Total Shares issuable under Convertible Note obligations &#8211; if converted total dilutive</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xml:lang="en-US">Total excluded under treasury method &#8211; out of the money</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ImpairmentCharges" xlink:label="ATCH_ImpairmentCharges" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ImpairmentCharges" xlink:to="ATCH_ImpairmentCharges_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ImpairmentCharges_lbl" xml:lang="en-US">Impairment charges</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFDICInsuredAmount" xlink:label="us-gaap_CashFDICInsuredAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashFDICInsuredAmount" xlink:to="us-gaap_CashFDICInsuredAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashFDICInsuredAmount_lbl" xml:lang="en-US">Cash, FDIC insured amount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CashDepositNumberOfFinancialInstitutions" xlink:label="ATCH_CashDepositNumberOfFinancialInstitutions" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashDepositNumberOfFinancialInstitutions" xlink:to="ATCH_CashDepositNumberOfFinancialInstitutions_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_CashDepositNumberOfFinancialInstitutions_lbl" xml:lang="en-US">Number of financial institutions in cash deposit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashUninsuredAmount" xlink:label="us-gaap_CashUninsuredAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashUninsuredAmount" xlink:to="us-gaap_CashUninsuredAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashUninsuredAmount_lbl" xml:lang="en-US">Excess amount of the FDIC limit</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DisclosureCashSegregatedInAccordanceWithFederalRegulationsTable" xlink:label="ATCH_DisclosureCashSegregatedInAccordanceWithFederalRegulationsTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DisclosureCashSegregatedInAccordanceWithFederalRegulationsTable" xlink:to="ATCH_DisclosureCashSegregatedInAccordanceWithFederalRegulationsTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DisclosureCashSegregatedInAccordanceWithFederalRegulationsTable_lbl" xml:lang="en-US">DisclosureCashSegregatedInAccordanceWithFederalRegulationsTable [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DisclosureCashSegregatedInAccordanceWithFederalRegulationsLineItems" xlink:label="ATCH_DisclosureCashSegregatedInAccordanceWithFederalRegulationsLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DisclosureCashSegregatedInAccordanceWithFederalRegulationsLineItems" xlink:to="ATCH_DisclosureCashSegregatedInAccordanceWithFederalRegulationsLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DisclosureCashSegregatedInAccordanceWithFederalRegulationsLineItems_lbl" xml:lang="en-US">DisclosureCashSegregatedInAccordanceWithFederalRegulationsLineItems [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CashReserveDepositRequired" xlink:label="ATCH_CashReserveDepositRequired" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashReserveDepositRequired" xlink:to="ATCH_CashReserveDepositRequired_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_CashReserveDepositRequired_lbl" xml:lang="en-US">Calculated required reserve</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations" xlink:label="us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations" xlink:to="us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations_lbl" xml:lang="en-US">Cash on deposit in the reserve account</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CashReserveDepositLessThanAmountRequired" xlink:label="ATCH_CashReserveDepositLessThanAmountRequired" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashReserveDepositLessThanAmountRequired" xlink:to="ATCH_CashReserveDepositLessThanAmountRequired_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_CashReserveDepositLessThanAmountRequired_lbl" xml:lang="en-US">Cash reserve deposit more than amount required</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Deposits" xlink:label="us-gaap_Deposits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Deposits" xlink:to="us-gaap_Deposits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Deposits_lbl" xml:lang="en-US">Cash on deposit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NetCapital" xlink:label="srt_NetCapital" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_NetCapital" xlink:to="srt_NetCapital_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_NetCapital_lbl" xml:lang="en-US">Net capital</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AlternativeExcessNetCapital" xlink:label="srt_AlternativeExcessNetCapital" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_AlternativeExcessNetCapital" xlink:to="srt_AlternativeExcessNetCapital_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_AlternativeExcessNetCapital_lbl" xml:lang="en-US">Net capital in excess of the minimum required</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US">Cash and cash equivalents</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CashSegregatedCustomers" xlink:label="ATCH_CashSegregatedCustomers" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashSegregatedCustomers" xlink:to="ATCH_CashSegregatedCustomers_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_CashSegregatedCustomers_lbl" xml:lang="en-US">Cash segregated - customers</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_3_lbl" xml:lang="en-US">Total cash and restricted cash shown in the statement of cash flows.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DisclosureLeaseAbstract" xlink:to="ATCH_DisclosureLeaseAbstract_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_DisclosureLeaseAbstract_2_lbl" xml:lang="en-US">Schedule Of Other Information Related To Companys Operating Leases</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_OperatingLeaseRightOfUseAssetBeginningBalance" xlink:label="ATCH_OperatingLeaseRightOfUseAssetBeginningBalance" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_OperatingLeaseRightOfUseAssetBeginningBalance" xlink:to="ATCH_OperatingLeaseRightOfUseAssetBeginningBalance_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_OperatingLeaseRightOfUseAssetBeginningBalance_lbl" xml:lang="en-US">Operating lease ROU Asset -</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability" xlink:label="ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability" xlink:to="ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability_lbl" xml:lang="en-US">Increase</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DecreaseInOperatingLeaseRightOfUseAsset" xlink:label="ATCH_DecreaseInOperatingLeaseRightOfUseAsset" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DecreaseInOperatingLeaseRightOfUseAsset" xlink:to="ATCH_DecreaseInOperatingLeaseRightOfUseAsset_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DecreaseInOperatingLeaseRightOfUseAsset_lbl" xml:lang="en-US">Decrease</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_OperatingLeaseRightOfUseAssetEndingBalance" xlink:label="ATCH_OperatingLeaseRightOfUseAssetEndingBalance" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_OperatingLeaseRightOfUseAssetEndingBalance" xlink:to="ATCH_OperatingLeaseRightOfUseAssetEndingBalance_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_OperatingLeaseRightOfUseAssetEndingBalance_lbl" xml:lang="en-US">Operating lease ROU Asset - Ending Balance</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityCurrent" xlink:to="us-gaap_OperatingLeaseLiabilityCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_2_lbl" xml:lang="en-US">Operating lease liability - Short Term</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:to="us-gaap_OperatingLeaseLiabilityNoncurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_2_lbl" xml:lang="en-US">Operating lease liability - Long Term</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability" xlink:label="us-gaap_OperatingLeaseLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingLeaseLiability" xlink:to="us-gaap_OperatingLeaseLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xml:lang="en-US">Operating lease liability - Total</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities" xlink:to="ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities_2_lbl" xml:lang="en-US">Right of use assets obtained in exchange for new operating lease liabilities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability" xlink:to="ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability_2_lbl" xml:lang="en-US">Right of use asset obtained exchange for operating lease liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:to="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_lbl" xml:lang="en-US">Related Party Transaction [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="us-gaap_RelatedPartyTransactionLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="us-gaap_RelatedPartyTransactionLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionLineItems_lbl" xml:lang="en-US">Related Party Transaction [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtConversionConvertedInstrumentValueTransferred" xlink:label="ATCH_DebtConversionConvertedInstrumentValueTransferred" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionConvertedInstrumentValueTransferred" xlink:to="ATCH_DebtConversionConvertedInstrumentValueTransferred_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtConversionConvertedInstrumentValueTransferred_lbl" xml:lang="en-US">Debt conversion, value transferred</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtConversionConvertedInstrumentSharesTransferred" xlink:label="ATCH_DebtConversionConvertedInstrumentSharesTransferred" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionConvertedInstrumentSharesTransferred" xlink:to="ATCH_DebtConversionConvertedInstrumentSharesTransferred_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtConversionConvertedInstrumentSharesTransferred_lbl" xml:lang="en-US">Debt conversion, shares transferred</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtConversionConvertedInstrumentSharesIssued1" xlink:label="us-gaap_DebtConversionConvertedInstrumentSharesIssued1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtConversionConvertedInstrumentSharesIssued1" xlink:to="us-gaap_DebtConversionConvertedInstrumentSharesIssued1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtConversionConvertedInstrumentSharesIssued1_lbl" xml:lang="en-US">Conversion, shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPayableCurrentAndNoncurrent" xlink:label="us-gaap_InterestPayableCurrentAndNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestPayableCurrentAndNoncurrent" xlink:to="us-gaap_InterestPayableCurrentAndNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestPayableCurrentAndNoncurrent_lbl" xml:lang="en-US">Interest payable</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_2_lbl" xml:lang="en-US">Debt interest rate</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentIncreaseAccruedInterest" xlink:label="us-gaap_DebtInstrumentIncreaseAccruedInterest" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentIncreaseAccruedInterest" xlink:to="us-gaap_DebtInstrumentIncreaseAccruedInterest_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentIncreaseAccruedInterest_lbl" xml:lang="en-US">Accrued amount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DueToRelatedParties" xlink:label="ATCH_DueToRelatedParties" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DueToRelatedParties" xlink:to="ATCH_DueToRelatedParties_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DueToRelatedParties_lbl" xml:lang="en-US">Due to related parties</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:to="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xml:lang="en-US">Payable to employees</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:to="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_2_lbl" xml:lang="en-US">Stock issued for services</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesIssuedPricePerShare" xlink:label="us-gaap_SharesIssuedPricePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssuedPricePerShare" xlink:to="us-gaap_SharesIssuedPricePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xml:lang="en-US">Sale price per share</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:to="us-gaap_StockIssuedDuringPeriodValueIssuedForServices_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueIssuedForServices_2_lbl" xml:lang="en-US">Value of stock issued for services</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Cash" xlink:label="us-gaap_Cash" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Cash" xlink:to="us-gaap_Cash_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Cash_lbl" xml:lang="en-US">Cash</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_UnitsIssuedDuringPeriodValueNewIssues" xlink:label="ATCH_UnitsIssuedDuringPeriodValueNewIssues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_UnitsIssuedDuringPeriodValueNewIssues" xlink:to="ATCH_UnitsIssuedDuringPeriodValueNewIssues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_UnitsIssuedDuringPeriodValueNewIssues_lbl" xml:lang="en-US">Units sold</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesTable" xlink:label="us-gaap_LossContingenciesTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingenciesTable" xlink:to="us-gaap_LossContingenciesTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingenciesTable_lbl" xml:lang="en-US">Loss Contingencies [Table]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets" xlink:to="us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets_2_lbl" xml:lang="en-US">Shares issued as purchase consideration for the assets</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EarnOutSharesMaximumNumberOfSharesIssuable" xlink:label="ATCH_EarnOutSharesMaximumNumberOfSharesIssuable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnOutSharesMaximumNumberOfSharesIssuable" xlink:to="ATCH_EarnOutSharesMaximumNumberOfSharesIssuable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EarnOutSharesMaximumNumberOfSharesIssuable_lbl" xml:lang="en-US">Earn Out Shares, maximum shares issuable to stockholders</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ThresholdPeriodFromClosingToAchieveMilestonesConsideredForIssuanceOfEarnOutShares" xlink:label="ATCH_ThresholdPeriodFromClosingToAchieveMilestonesConsideredForIssuanceOfEarnOutShares" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ThresholdPeriodFromClosingToAchieveMilestonesConsideredForIssuanceOfEarnOutShares" xlink:to="ATCH_ThresholdPeriodFromClosingToAchieveMilestonesConsideredForIssuanceOfEarnOutShares_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ThresholdPeriodFromClosingToAchieveMilestonesConsideredForIssuanceOfEarnOutShares_lbl" xml:lang="en-US">Threshold period from closing to achieve milestones considered for issuance of earn out shares</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EarnOutSharesMaximumAmountOfSharesIssuable" xlink:label="ATCH_EarnOutSharesMaximumAmountOfSharesIssuable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnOutSharesMaximumAmountOfSharesIssuable" xlink:to="ATCH_EarnOutSharesMaximumAmountOfSharesIssuable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EarnOutSharesMaximumAmountOfSharesIssuable_lbl" xml:lang="en-US">Software Products Earn Out Shares, maximum amount of shares issuable to stockholders</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PeriodForMeasurementOfRevenueTargets" xlink:label="ATCH_PeriodForMeasurementOfRevenueTargets" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PeriodForMeasurementOfRevenueTargets" xlink:to="ATCH_PeriodForMeasurementOfRevenueTargets_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PeriodForMeasurementOfRevenueTargets_lbl" xml:lang="en-US">Period for measurement of revenue targets</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementTermOfEmployment" xlink:label="ATCH_EmploymentAgreementTermOfEmployment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementTermOfEmployment" xlink:to="ATCH_EmploymentAgreementTermOfEmployment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementTermOfEmployment_lbl" xml:lang="en-US">Term of employment</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementTermOfRenewal" xlink:label="ATCH_EmploymentAgreementTermOfRenewal" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementTermOfRenewal" xlink:to="ATCH_EmploymentAgreementTermOfRenewal_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementTermOfRenewal_lbl" xml:lang="en-US">Employment agreement term of renewal</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementAnnualBaseSalaryYearOne" xlink:label="ATCH_EmploymentAgreementAnnualBaseSalaryYearOne" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementAnnualBaseSalaryYearOne" xlink:to="ATCH_EmploymentAgreementAnnualBaseSalaryYearOne_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementAnnualBaseSalaryYearOne_lbl" xml:lang="en-US">Annual base salary, year one</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementAnnualBaseSalaryYearTwo" xlink:label="ATCH_EmploymentAgreementAnnualBaseSalaryYearTwo" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementAnnualBaseSalaryYearTwo" xlink:to="ATCH_EmploymentAgreementAnnualBaseSalaryYearTwo_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementAnnualBaseSalaryYearTwo_lbl" xml:lang="en-US">Annual base salary, year two</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementAnnualBaseSalaryYearThree" xlink:label="ATCH_EmploymentAgreementAnnualBaseSalaryYearThree" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementAnnualBaseSalaryYearThree" xlink:to="ATCH_EmploymentAgreementAnnualBaseSalaryYearThree_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementAnnualBaseSalaryYearThree_lbl" xml:lang="en-US">Annual base salary, year three</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedBonusesCurrentAndNoncurrent" xlink:label="us-gaap_AccruedBonusesCurrentAndNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedBonusesCurrentAndNoncurrent" xlink:to="us-gaap_AccruedBonusesCurrentAndNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedBonusesCurrentAndNoncurrent_lbl" xml:lang="en-US">Cash signing bonus</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PercentageOfBonusPayable" xlink:label="ATCH_PercentageOfBonusPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PercentageOfBonusPayable" xlink:to="ATCH_PercentageOfBonusPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PercentageOfBonusPayable_lbl" xml:lang="en-US">Percentage of bonus payable</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_MinimumQualifiedCumulativeFinancingAmount" xlink:label="ATCH_MinimumQualifiedCumulativeFinancingAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MinimumQualifiedCumulativeFinancingAmount" xlink:to="ATCH_MinimumQualifiedCumulativeFinancingAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_MinimumQualifiedCumulativeFinancingAmount_lbl" xml:lang="en-US">Minimum qualified cumulative financing</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PercentageOfBonusPayableFourthQuarter" xlink:label="ATCH_PercentageOfBonusPayableFourthQuarter" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PercentageOfBonusPayableFourthQuarter" xlink:to="ATCH_PercentageOfBonusPayableFourthQuarter_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PercentageOfBonusPayableFourthQuarter_lbl" xml:lang="en-US">Percentage of bonus payable fourth quarter</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PercentageOfBonusPayableFirstQuarter" xlink:label="ATCH_PercentageOfBonusPayableFirstQuarter" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PercentageOfBonusPayableFirstQuarter" xlink:to="ATCH_PercentageOfBonusPayableFirstQuarter_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PercentageOfBonusPayableFirstQuarter_lbl" xml:lang="en-US">Percentage of bonus payable first quarter</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementStockGrants" xlink:label="ATCH_EmploymentAgreementStockGrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementStockGrants" xlink:to="ATCH_EmploymentAgreementStockGrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementStockGrants_lbl" xml:lang="en-US">Stock grants</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementNumberOfStockAwards" xlink:label="ATCH_EmploymentAgreementNumberOfStockAwards" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementNumberOfStockAwards" xlink:to="ATCH_EmploymentAgreementNumberOfStockAwards_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementNumberOfStockAwards_lbl" xml:lang="en-US">Number of stock awards</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ThresholdPercentageOfOutstandingSharesForDeterminingStockAward" xlink:label="ATCH_ThresholdPercentageOfOutstandingSharesForDeterminingStockAward" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ThresholdPercentageOfOutstandingSharesForDeterminingStockAward" xlink:to="ATCH_ThresholdPercentageOfOutstandingSharesForDeterminingStockAward_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ThresholdPercentageOfOutstandingSharesForDeterminingStockAward_lbl" xml:lang="en-US">Threshold percentage of outstanding shares for determining stock award</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xml:lang="en-US">Vesting period</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WeightedAveragePrice" xlink:label="ATCH_WeightedAveragePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WeightedAveragePrice" xlink:to="ATCH_WeightedAveragePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WeightedAveragePrice_lbl" xml:lang="en-US">Weighted average price</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementThresholdPeriodOfWrittenNoticeOfNonRenewal" xlink:label="ATCH_EmploymentAgreementThresholdPeriodOfWrittenNoticeOfNonRenewal" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementThresholdPeriodOfWrittenNoticeOfNonRenewal" xlink:to="ATCH_EmploymentAgreementThresholdPeriodOfWrittenNoticeOfNonRenewal_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementThresholdPeriodOfWrittenNoticeOfNonRenewal_lbl" xml:lang="en-US">Threshold period of written notice of non renewal</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ThresholdTradingDaysOverWhichVolumeWeightedAverageStockPriceConsideredCalculatingStockTradingPrice" xlink:label="ATCH_ThresholdTradingDaysOverWhichVolumeWeightedAverageStockPriceConsideredCalculatingStockTradingPrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ThresholdTradingDaysOverWhichVolumeWeightedAverageStockPriceConsideredCalculatingStockTradingPrice" xlink:to="ATCH_ThresholdTradingDaysOverWhichVolumeWeightedAverageStockPriceConsideredCalculatingStockTradingPrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ThresholdTradingDaysOverWhichVolumeWeightedAverageStockPriceConsideredCalculatingStockTradingPrice_lbl" xml:lang="en-US">Threshold trading days over which volume weighted average stock price considered calculating stock trading price</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementOneTimeSignInBonusPaid" xlink:label="ATCH_EmploymentAgreementOneTimeSignInBonusPaid" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementOneTimeSignInBonusPaid" xlink:to="ATCH_EmploymentAgreementOneTimeSignInBonusPaid_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementOneTimeSignInBonusPaid_lbl" xml:lang="en-US">One time sign in bonus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarnestMoneyDeposits" xlink:label="us-gaap_EarnestMoneyDeposits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarnestMoneyDeposits" xlink:to="us-gaap_EarnestMoneyDeposits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarnestMoneyDeposits_lbl" xml:lang="en-US">Earnest money deposits</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyDamagesAwardedValue" xlink:label="us-gaap_LossContingencyDamagesAwardedValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LossContingencyDamagesAwardedValue" xlink:to="us-gaap_LossContingencyDamagesAwardedValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LossContingencyDamagesAwardedValue_lbl" xml:lang="en-US">Amount of damages awarded to the plaintiff in the legal matter</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_LossContingencyReductionInDamageAwarded" xlink:label="ATCH_LossContingencyReductionInDamageAwarded" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LossContingencyReductionInDamageAwarded" xlink:to="ATCH_LossContingencyReductionInDamageAwarded_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_LossContingencyReductionInDamageAwarded_lbl" xml:lang="en-US">Damage reduced</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LitigationReserveNoncurrent" xlink:label="us-gaap_LitigationReserveNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LitigationReserveNoncurrent" xlink:to="us-gaap_LitigationReserveNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_LitigationReserveNoncurrent_lbl" xml:lang="en-US">Accrued contingent liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesPayable" xlink:label="us-gaap_NotesPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NotesPayable" xlink:to="us-gaap_NotesPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_NotesPayable_lbl" xml:lang="en-US">Promissory notes</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_MergerFinancingDerivative" xlink:label="ATCH_MergerFinancingDerivative" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingDerivative" xlink:to="ATCH_MergerFinancingDerivative_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_MergerFinancingDerivative_lbl" xml:lang="en-US">Merger financing -derivative</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharePurchaseCommitmentAmountCurrent" xlink:to="ATCH_SharePurchaseCommitmentAmountCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_SharePurchaseCommitmentAmountCurrent_2_lbl" xml:lang="en-US">Tau Agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DerivativeLiabilityDebenture" xlink:label="ATCH_DerivativeLiabilityDebenture" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeLiabilityDebenture" xlink:to="ATCH_DerivativeLiabilityDebenture_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DerivativeLiabilityDebenture_lbl" xml:lang="en-US">Derivative liability - debenture</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ConvertibleNoteDerivative" xlink:label="ATCH_ConvertibleNoteDerivative" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNoteDerivative" xlink:to="ATCH_ConvertibleNoteDerivative_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ConvertibleNoteDerivative_lbl" xml:lang="en-US">Convertible note - derivative</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermBorrowings" xlink:label="us-gaap_ShortTermBorrowings" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermBorrowings" xlink:to="us-gaap_ShortTermBorrowings_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShortTermBorrowings_lbl" xml:lang="en-US">Current portion</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SecuredLongTermDebt" xlink:to="us-gaap_SecuredLongTermDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_SecuredLongTermDebt_2_lbl" xml:lang="en-US">Secured Convertible Note, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt" xlink:label="us-gaap_LongTermDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermDebt" xlink:to="us-gaap_LongTermDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongTermDebt_lbl" xml:lang="en-US">Long term portion</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_2_lbl" xml:lang="en-US">Number of shares issued</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionOriginalDebtPrincipalAmount" xlink:to="ATCH_DebtConversionOriginalDebtPrincipalAmount_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtConversionOriginalDebtPrincipalAmount_2_lbl" xml:lang="en-US">Principal amount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtInstrumentConvertibleConversionRateAsPercentageOfSpecifiedTradingDaysVolumeWeightedAverageSharePrice" xlink:label="ATCH_DebtInstrumentConvertibleConversionRateAsPercentageOfSpecifiedTradingDaysVolumeWeightedAverageSharePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtInstrumentConvertibleConversionRateAsPercentageOfSpecifiedTradingDaysVolumeWeightedAverageSharePrice" xlink:to="ATCH_DebtInstrumentConvertibleConversionRateAsPercentageOfSpecifiedTradingDaysVolumeWeightedAverageSharePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtInstrumentConvertibleConversionRateAsPercentageOfSpecifiedTradingDaysVolumeWeightedAverageSharePrice_lbl" xml:lang="en-US">Conversion rate as a percentage of specified trading days volume weighted average share price</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPrice1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:to="us-gaap_DebtInstrumentConvertibleConversionPrice1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPrice1_lbl" xml:lang="en-US">Debt instrument, conversion price</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfDebtDiscountPremium" xlink:label="us-gaap_AmortizationOfDebtDiscountPremium" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfDebtDiscountPremium" xlink:to="us-gaap_AmortizationOfDebtDiscountPremium_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AmortizationOfDebtDiscountPremium_lbl" xml:lang="en-US">Amortization of discount</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConvertibleDebtNoncurrent" xlink:to="us-gaap_ConvertibleDebtNoncurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ConvertibleDebtNoncurrent_2_lbl" xml:lang="en-US">Convertible note, balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebt" xlink:label="us-gaap_InterestExpenseDebt" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpenseDebt" xlink:to="us-gaap_InterestExpenseDebt_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestExpenseDebt_lbl" xml:lang="en-US">Interest expense on convertible notes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet" xlink:to="us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_lbl" xml:lang="en-US">Debt instrument, unamortized debt discount premium</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockTransferredDuringPeriodByRelatedPartySharesConversionOfConvertibleSecuritiesInterest" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartySharesConversionOfConvertibleSecuritiesInterest" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockTransferredDuringPeriodByRelatedPartySharesConversionOfConvertibleSecuritiesInterest" xlink:to="ATCH_StockTransferredDuringPeriodByRelatedPartySharesConversionOfConvertibleSecuritiesInterest_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartySharesConversionOfConvertibleSecuritiesInterest_lbl" xml:lang="en-US">Shares transferred by related party for conversion</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtConversionConvertedInstrumentAmountConversionOfInterestOfConvertibleNotes" xlink:label="ATCH_DebtConversionConvertedInstrumentAmountConversionOfInterestOfConvertibleNotes" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionConvertedInstrumentAmountConversionOfInterestOfConvertibleNotes" xlink:to="ATCH_DebtConversionConvertedInstrumentAmountConversionOfInterestOfConvertibleNotes_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtConversionConvertedInstrumentAmountConversionOfInterestOfConvertibleNotes_lbl" xml:lang="en-US">Pay for accrued interest</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="us-gaap_DebtInstrumentCarryingAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentCarryingAmount" xlink:to="us-gaap_DebtInstrumentCarryingAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentCarryingAmount_lbl" xml:lang="en-US">Principal balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentMaturityDate" xlink:to="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xml:lang="en-US">Maturity date</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_3_lbl" xml:lang="en-US">Debt instrument, interest rate</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtInstrumentInterestRateInEventOfDefault" xlink:label="ATCH_DebtInstrumentInterestRateInEventOfDefault" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtInstrumentInterestRateInEventOfDefault" xlink:to="ATCH_DebtInstrumentInterestRateInEventOfDefault_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtInstrumentInterestRateInEventOfDefault_lbl" xml:lang="en-US">Interest rate in the event of default (in percent)</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtConversionConvertedInstrumentRate" xlink:label="us-gaap_DebtConversionConvertedInstrumentRate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtConversionConvertedInstrumentRate" xlink:to="us-gaap_DebtConversionConvertedInstrumentRate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtConversionConvertedInstrumentRate_lbl" xml:lang="en-US">Debt instrument, conversion rate</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LegalFees" xlink:label="us-gaap_LegalFees" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LegalFees" xlink:to="us-gaap_LegalFees_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LegalFees_lbl" xml:lang="en-US">Legal fees</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_TransactionCost" xlink:label="ATCH_TransactionCost" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TransactionCost" xlink:to="ATCH_TransactionCost_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_TransactionCost_lbl" xml:lang="en-US">[custom:TransactionCost]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPayableCurrent" xlink:label="us-gaap_InterestPayableCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestPayableCurrent" xlink:to="us-gaap_InterestPayableCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InterestPayableCurrent_lbl" xml:lang="en-US">Interest payable</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest_lbl" xml:lang="en-US">Accumulated interest</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_lbl" xml:lang="en-US">Fair vale on accumulated interest</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_IndividualAdvancesRequestedThresholdTradingDays" xlink:label="ATCH_IndividualAdvancesRequestedThresholdTradingDays" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_IndividualAdvancesRequestedThresholdTradingDays" xlink:to="ATCH_IndividualAdvancesRequestedThresholdTradingDays_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_IndividualAdvancesRequestedThresholdTradingDays_lbl" xml:lang="en-US">Threshold trading days</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_AmortizationOfDebtDiscount" xlink:label="ATCH_AmortizationOfDebtDiscount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AmortizationOfDebtDiscount" xlink:to="ATCH_AmortizationOfDebtDiscount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_AmortizationOfDebtDiscount_lbl" xml:lang="en-US">Amortization of discount</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits" xlink:to="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits_2_lbl" xml:lang="en-US">Reverse split shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentIssuedPrincipal" xlink:label="us-gaap_DebtInstrumentIssuedPrincipal" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentIssuedPrincipal" xlink:to="us-gaap_DebtInstrumentIssuedPrincipal_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_DebtInstrumentIssuedPrincipal_lbl" xml:lang="en-US">Interest expense on convertible notes</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:to="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_2_lbl" xml:lang="en-US">Shares issued as conversion in principle on convertible notes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:to="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xml:lang="en-US">Common stock issuable</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongTermDebt" xlink:to="us-gaap_LongTermDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_LongTermDebt_2_lbl" xml:lang="en-US">Total carrying balance</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtConversionOriginalDebtAmountContingentGuarantee" xlink:label="ATCH_DebtConversionOriginalDebtAmountContingentGuarantee" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionOriginalDebtAmountContingentGuarantee" xlink:to="ATCH_DebtConversionOriginalDebtAmountContingentGuarantee_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtConversionOriginalDebtAmountContingentGuarantee_lbl" xml:lang="en-US">[custom:DebtConversionOriginalDebtAmountContingentGuarantee]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_MergerFinancingConvertibleNoteNoncurrent" xlink:label="ATCH_MergerFinancingConvertibleNoteNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingConvertibleNoteNoncurrent" xlink:to="ATCH_MergerFinancingConvertibleNoteNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_MergerFinancingConvertibleNoteNoncurrent_lbl" xml:lang="en-US">[custom:MergerFinancingConvertibleNoteNoncurrent-0]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_UnamortizedDiscountPremiumContingentGuarantee" xlink:label="ATCH_UnamortizedDiscountPremiumContingentGuarantee" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_UnamortizedDiscountPremiumContingentGuarantee" xlink:to="ATCH_UnamortizedDiscountPremiumContingentGuarantee_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_UnamortizedDiscountPremiumContingentGuarantee_lbl" xml:lang="en-US">[custom:UnamortizedDiscountPremiumContingentGuarantee]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_AmortizationOfDebtDiscountPremiumContingentGuarantee" xlink:label="ATCH_AmortizationOfDebtDiscountPremiumContingentGuarantee" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AmortizationOfDebtDiscountPremiumContingentGuarantee" xlink:to="ATCH_AmortizationOfDebtDiscountPremiumContingentGuarantee_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_AmortizationOfDebtDiscountPremiumContingentGuarantee_lbl" xml:lang="en-US">[custom:AmortizationOfDebtDiscountPremiumContingentGuarantee]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_InterestOnContingentGuarantee" xlink:label="ATCH_InterestOnContingentGuarantee" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InterestOnContingentGuarantee" xlink:to="ATCH_InterestOnContingentGuarantee_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_InterestOnContingentGuarantee_lbl" xml:lang="en-US">[custom:InterestOnContingentGuarantee]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SharesToBeIssuedAmount" xlink:label="ATCH_SharesToBeIssuedAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesToBeIssuedAmount" xlink:to="ATCH_SharesToBeIssuedAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SharesToBeIssuedAmount_lbl" xml:lang="en-US">Amount of advance notices</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityReverseStockSplit" xlink:to="us-gaap_StockholdersEquityReverseStockSplit_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockholdersEquityReverseStockSplit_2_lbl" xml:lang="en-US">Post reverse split</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SaleOfSharesUnderSharePurchaseAgreement" xlink:label="ATCH_SaleOfSharesUnderSharePurchaseAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SaleOfSharesUnderSharePurchaseAgreement" xlink:to="ATCH_SaleOfSharesUnderSharePurchaseAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SaleOfSharesUnderSharePurchaseAgreement_lbl" xml:lang="en-US">Shares sold under the share purchase agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockPurchasedDuringPeriodSharesSharePurchaseAgreement" xlink:label="ATCH_StockPurchasedDuringPeriodSharesSharePurchaseAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPurchasedDuringPeriodSharesSharePurchaseAgreement" xlink:to="ATCH_StockPurchasedDuringPeriodSharesSharePurchaseAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockPurchasedDuringPeriodSharesSharePurchaseAgreement_lbl" xml:lang="en-US">Shares purchased during the period under the agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockPurchasedDuringPeriodSharesRealizedGain" xlink:label="ATCH_StockPurchasedDuringPeriodSharesRealizedGain" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPurchasedDuringPeriodSharesRealizedGain" xlink:to="ATCH_StockPurchasedDuringPeriodSharesRealizedGain_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockPurchasedDuringPeriodSharesRealizedGain_lbl" xml:lang="en-US">Shares purchased during the period realized gain</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PayableCommonStockRedeemed" xlink:label="us-gaap_PayableCommonStockRedeemed" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PayableCommonStockRedeemed" xlink:to="us-gaap_PayableCommonStockRedeemed_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PayableCommonStockRedeemed_lbl" xml:lang="en-US">Stock payable in equity</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesIssued" xlink:label="us-gaap_SharesIssued" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssued" xlink:to="us-gaap_SharesIssued_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesIssued_lbl" xml:lang="en-US">Shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SharesAvailableUnderSharePurchaseAgreement" xlink:label="ATCH_SharesAvailableUnderSharePurchaseAgreement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesAvailableUnderSharePurchaseAgreement" xlink:to="ATCH_SharesAvailableUnderSharePurchaseAgreement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SharesAvailableUnderSharePurchaseAgreement_lbl" xml:lang="en-US">Shares available under share purchase agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesSubjectToCompromiseEmployeeAndDeemedClaims" xlink:label="us-gaap_LiabilitiesSubjectToCompromiseEmployeeAndDeemedClaims" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesSubjectToCompromiseEmployeeAndDeemedClaims" xlink:to="us-gaap_LiabilitiesSubjectToCompromiseEmployeeAndDeemedClaims_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesSubjectToCompromiseEmployeeAndDeemedClaims_lbl" xml:lang="en-US">Fair value deemed</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:to="us-gaap_DebtConversionConvertedInstrumentAmount1_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtConversionConvertedInstrumentAmount1_3_lbl" xml:lang="en-US">Convertible amount</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssuedPricePerShare" xlink:to="us-gaap_SharesIssuedPricePerShare_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_SharesIssuedPricePerShare_2_lbl" xml:lang="en-US">Sale price per share per share</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtConversionsOriginalDebtInterestAmount" xlink:label="ATCH_DebtConversionsOriginalDebtInterestAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionsOriginalDebtInterestAmount" xlink:to="ATCH_DebtConversionsOriginalDebtInterestAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_DebtConversionsOriginalDebtInterestAmount_lbl" xml:lang="en-US">Interest amount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_NumberOfSharesIssuableUponDebtConversion" xlink:label="ATCH_NumberOfSharesIssuableUponDebtConversion" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_NumberOfSharesIssuableUponDebtConversion" xlink:to="ATCH_NumberOfSharesIssuableUponDebtConversion_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_NumberOfSharesIssuableUponDebtConversion_lbl" xml:lang="en-US">Number of shares issuable upon debt conversion</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestPayableCurrentAndNoncurrent" xlink:to="us-gaap_InterestPayableCurrentAndNoncurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InterestPayableCurrentAndNoncurrent_2_lbl" xml:lang="en-US">Accrued interest net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecurityDepositLiability" xlink:label="us-gaap_SecurityDepositLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SecurityDepositLiability" xlink:to="us-gaap_SecurityDepositLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SecurityDepositLiability_lbl" xml:lang="en-US">Deposit</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NotesPayable" xlink:to="us-gaap_NotesPayable_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NotesPayable_2_lbl" xml:lang="en-US">Promissory note</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentPeriodicPayment" xlink:label="us-gaap_DebtInstrumentPeriodicPayment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentPeriodicPayment" xlink:to="us-gaap_DebtInstrumentPeriodicPayment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentPeriodicPayment_lbl" xml:lang="en-US">Monthly payments</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:to="us-gaap_StockIssuedDuringPeriodValueIssuedForServices_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueIssuedForServices_3_lbl" xml:lang="en-US">Stock Issued During Period, Value, Issued for Services</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ValueOfSharesIssuableForServicesInEachInstallment" xlink:label="ATCH_ValueOfSharesIssuableForServicesInEachInstallment" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ValueOfSharesIssuableForServicesInEachInstallment" xlink:to="ATCH_ValueOfSharesIssuableForServicesInEachInstallment_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ValueOfSharesIssuableForServicesInEachInstallment_lbl" xml:lang="en-US">[custom:ValueOfSharesIssuableForServicesInEachInstallment-0]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SubscriptionPayableLiabilityNoncurrent" xlink:label="ATCH_SubscriptionPayableLiabilityNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SubscriptionPayableLiabilityNoncurrent" xlink:to="ATCH_SubscriptionPayableLiabilityNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SubscriptionPayableLiabilityNoncurrent_lbl" xml:lang="en-US">[custom:SubscriptionPayableLiabilityNoncurrent-0]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInDepositOtherAssets" xlink:to="us-gaap_IncreaseDecreaseInDepositOtherAssets_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInDepositOtherAssets_2_lbl" xml:lang="en-US">Deemed value</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodValueNewIssues_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_2_lbl" xml:lang="en-US">Common Stock with fair value</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_LossOnSettlement" xlink:label="ATCH_LossOnSettlement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LossOnSettlement" xlink:to="ATCH_LossOnSettlement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_LossOnSettlement_lbl" xml:lang="en-US">Loss on settlement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromConvertibleDebt" xlink:to="us-gaap_ProceedsFromConvertibleDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ProceedsFromConvertibleDebt_2_lbl" xml:lang="en-US">Proceeds from convertible notes, net of transaction cost</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PercentageOfProceedsRaisedInExcessOfThresholdAmount" xlink:label="ATCH_PercentageOfProceedsRaisedInExcessOfThresholdAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PercentageOfProceedsRaisedInExcessOfThresholdAmount" xlink:to="ATCH_PercentageOfProceedsRaisedInExcessOfThresholdAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PercentageOfProceedsRaisedInExcessOfThresholdAmount_lbl" xml:lang="en-US">Percentage of proceeds raised in excess of threshold amount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ThirdPartyFinancingThresholdAmount" xlink:label="ATCH_ThirdPartyFinancingThresholdAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ThirdPartyFinancingThresholdAmount" xlink:to="ATCH_ThirdPartyFinancingThresholdAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ThirdPartyFinancingThresholdAmount_lbl" xml:lang="en-US">Threshold amount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ThresholdPeriodToFileRegistrationStatement" xlink:label="ATCH_ThresholdPeriodToFileRegistrationStatement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ThresholdPeriodToFileRegistrationStatement" xlink:to="ATCH_ThresholdPeriodToFileRegistrationStatement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ThresholdPeriodToFileRegistrationStatement_lbl" xml:lang="en-US">Threshold period</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities" xlink:label="us-gaap_DerivativeLiabilities" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DerivativeLiabilities" xlink:to="us-gaap_DerivativeLiabilities_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DerivativeLiabilities_lbl" xml:lang="en-US">Derivative issuance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsNet" xlink:label="us-gaap_DeferredFinanceCostsNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DeferredFinanceCostsNet" xlink:to="us-gaap_DeferredFinanceCostsNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DeferredFinanceCostsNet_lbl" xml:lang="en-US">Debt issuance costs</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpense" xlink:label="us-gaap_InterestExpense" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpense" xlink:to="us-gaap_InterestExpense_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestExpense_lbl" xml:lang="en-US">Interest expense</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtCurrent" xlink:label="us-gaap_DebtCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtCurrent" xlink:to="us-gaap_DebtCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtCurrent_lbl" xml:lang="en-US">Debt</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtInstrumentDiscountPercentage" xlink:label="ATCH_DebtInstrumentDiscountPercentage" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtInstrumentDiscountPercentage" xlink:to="ATCH_DebtInstrumentDiscountPercentage_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtInstrumentDiscountPercentage_lbl" xml:lang="en-US">Debt discount percentage</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_QualifiedFinancingThresholdGrossProceeds" xlink:label="ATCH_QualifiedFinancingThresholdGrossProceeds" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_QualifiedFinancingThresholdGrossProceeds" xlink:to="ATCH_QualifiedFinancingThresholdGrossProceeds_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_QualifiedFinancingThresholdGrossProceeds_lbl" xml:lang="en-US">Qualified financing, threshold gross proceeds</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:label="us-gaap_DebtInstrumentInterestRateDuringPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:to="us-gaap_DebtInstrumentInterestRateDuringPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentInterestRateDuringPeriod_lbl" xml:lang="en-US">Debt discount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtInstrumentAggregateDiscountOnIssuance" xlink:label="ATCH_DebtInstrumentAggregateDiscountOnIssuance" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtInstrumentAggregateDiscountOnIssuance" xlink:to="ATCH_DebtInstrumentAggregateDiscountOnIssuance_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtInstrumentAggregateDiscountOnIssuance_lbl" xml:lang="en-US">Amount of discount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DebtInstrumentOriginalIssueDiscount" xlink:label="ATCH_DebtInstrumentOriginalIssueDiscount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtInstrumentOriginalIssueDiscount" xlink:to="ATCH_DebtInstrumentOriginalIssueDiscount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_DebtInstrumentOriginalIssueDiscount_lbl" xml:lang="en-US">Debt instrument original issue discount</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfConvertibleDebt" xlink:to="us-gaap_RepaymentsOfConvertibleDebt_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RepaymentsOfConvertibleDebt_2_lbl" xml:lang="en-US">Convertible notes repaid</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNotesTransferredToEquitySpa" xlink:to="ATCH_ConvertibleNotesTransferredToEquitySpa_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_ConvertibleNotesTransferredToEquitySpa_2_lbl" xml:lang="en-US">Convertible notes transferred</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:to="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_2_lbl" xml:lang="en-US">Conversion of units</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_UnitPricePerShare" xlink:label="ATCH_UnitPricePerShare" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_UnitPricePerShare" xlink:to="ATCH_UnitPricePerShare_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_UnitPricePerShare_lbl" xml:lang="en-US">Price per unit</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsFairValueDisclosure" xlink:label="us-gaap_InvestmentsFairValueDisclosure" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentsFairValueDisclosure" xlink:to="us-gaap_InvestmentsFairValueDisclosure_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentsFairValueDisclosure_lbl" xml:lang="en-US">Investment of equity total</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfEquityMethodInvestments" xlink:label="us-gaap_ProceedsFromSaleOfEquityMethodInvestments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromSaleOfEquityMethodInvestments" xlink:to="us-gaap_ProceedsFromSaleOfEquityMethodInvestments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromSaleOfEquityMethodInvestments_lbl" xml:lang="en-US">Proceeds from equity investments</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtFairValueDisclosures" xlink:label="us-gaap_ConvertibleDebtFairValueDisclosures" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConvertibleDebtFairValueDisclosures" xlink:to="us-gaap_ConvertibleDebtFairValueDisclosures_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConvertibleDebtFairValueDisclosures_lbl" xml:lang="en-US">Converted from Convertible Notes</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarrantsAndRightsOutstandingTerm" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantsAndRightsOutstandingTerm" xlink:to="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xml:lang="en-US">Warrant term</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" xlink:to="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_2_lbl" xml:lang="en-US">Number of shares per warrant</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:to="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_2_lbl" xml:lang="en-US">Warrant exercise price per share</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ClassOfWarrantOrRightExercisePriceDeterminationNumberOfClosingBidPrice" xlink:label="ATCH_ClassOfWarrantOrRightExercisePriceDeterminationNumberOfClosingBidPrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ClassOfWarrantOrRightExercisePriceDeterminationNumberOfClosingBidPrice" xlink:to="ATCH_ClassOfWarrantOrRightExercisePriceDeterminationNumberOfClosingBidPrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ClassOfWarrantOrRightExercisePriceDeterminationNumberOfClosingBidPrice_lbl" xml:lang="en-US">Number of closing bid price</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ClassOfWarrantOrRightNumberOfDaysForExercisePriceDetermination" xlink:label="ATCH_ClassOfWarrantOrRightNumberOfDaysForExercisePriceDetermination" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ClassOfWarrantOrRightNumberOfDaysForExercisePriceDetermination" xlink:to="ATCH_ClassOfWarrantOrRightNumberOfDaysForExercisePriceDetermination_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ClassOfWarrantOrRightNumberOfDaysForExercisePriceDetermination_lbl" xml:lang="en-US">Days for calculating bid price</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EquityFinancingParticipationRightTriggerPeriod" xlink:label="ATCH_EquityFinancingParticipationRightTriggerPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EquityFinancingParticipationRightTriggerPeriod" xlink:to="ATCH_EquityFinancingParticipationRightTriggerPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EquityFinancingParticipationRightTriggerPeriod_lbl" xml:lang="en-US">Period for conducting subsequent financing</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EquityFinancingMinimumThresholdInvestmentForFutureOffering" xlink:label="ATCH_EquityFinancingMinimumThresholdInvestmentForFutureOffering" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EquityFinancingMinimumThresholdInvestmentForFutureOffering" xlink:to="ATCH_EquityFinancingMinimumThresholdInvestmentForFutureOffering_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EquityFinancingMinimumThresholdInvestmentForFutureOffering_lbl" xml:lang="en-US">Minimum threshold investment amount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EquityFinancingMaximumReinvestmentPercentage" xlink:label="ATCH_EquityFinancingMaximumReinvestmentPercentage" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EquityFinancingMaximumReinvestmentPercentage" xlink:to="ATCH_EquityFinancingMaximumReinvestmentPercentage_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EquityFinancingMaximumReinvestmentPercentage_lbl" xml:lang="en-US">Percentage of investment amount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PlacementAgentFeeRateGrossProceedsFromNotesPayable" xlink:label="ATCH_PlacementAgentFeeRateGrossProceedsFromNotesPayable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PlacementAgentFeeRateGrossProceedsFromNotesPayable" xlink:to="ATCH_PlacementAgentFeeRateGrossProceedsFromNotesPayable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PlacementAgentFeeRateGrossProceedsFromNotesPayable_lbl" xml:lang="en-US">Placement agent fees, percentage of notes</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToExistingInvestors" xlink:label="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToExistingInvestors" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToExistingInvestors" xlink:to="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToExistingInvestors_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToExistingInvestors_lbl" xml:lang="en-US">Placement agent fees, percentage of sale of units to existing investors</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToNewInvestors" xlink:label="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToNewInvestors" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToNewInvestors" xlink:to="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToNewInvestors_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToNewInvestors_lbl" xml:lang="en-US">Placement agent fees, percentage of sale of units to new investors</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentOfFinancingAndStockIssuanceCosts" xlink:to="us-gaap_PaymentOfFinancingAndStockIssuanceCosts_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentOfFinancingAndStockIssuanceCosts_2_lbl" xml:lang="en-US">Total transaction cost paid</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:to="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_lbl" xml:lang="en-US">Warrants exercised to purchase of common stock</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:to="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xml:lang="en-US">Warrants to purchase of common stock fair value</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetAcquisitionConsiderationTransferred" xlink:label="us-gaap_AssetAcquisitionConsiderationTransferred" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetAcquisitionConsiderationTransferred" xlink:to="us-gaap_AssetAcquisitionConsiderationTransferred_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetAcquisitionConsiderationTransferred_lbl" xml:lang="en-US">Transaction cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfWarrants" xlink:label="us-gaap_ProceedsFromIssuanceOfWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfWarrants" xlink:to="us-gaap_ProceedsFromIssuanceOfWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfWarrants_lbl" xml:lang="en-US">Warrants issued</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WarrantsToPurchaseOfCommonStockTransactionCostTotal" xlink:label="ATCH_WarrantsToPurchaseOfCommonStockTransactionCostTotal" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WarrantsToPurchaseOfCommonStockTransactionCostTotal" xlink:to="ATCH_WarrantsToPurchaseOfCommonStockTransactionCostTotal_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WarrantsToPurchaseOfCommonStockTransactionCostTotal_lbl" xml:lang="en-US">Transaction cost of warrants to purchase of common stock</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueOther" xlink:to="us-gaap_StockIssuedDuringPeriodValueOther_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueOther_2_lbl" xml:lang="en-US">Units sold</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:to="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_lbl" xml:lang="en-US">Intangible Asset, Finite-Lived [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems_lbl" xml:lang="en-US">Intangible Asset, Finite-Lived [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsGross" xlink:to="us-gaap_FiniteLivedIntangibleAssetsGross_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross_lbl" xml:lang="en-US">Intangible assets, cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl" xml:lang="en-US">Intangible assets, accumulated amortization</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived" xlink:label="us-gaap_ImpairmentOfIntangibleAssetsFinitelived" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ImpairmentOfIntangibleAssetsFinitelived" xlink:to="us-gaap_ImpairmentOfIntangibleAssetsFinitelived_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ImpairmentOfIntangibleAssetsFinitelived_lbl" xml:lang="en-US">Impairment of assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsNet" xlink:to="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet_lbl" xml:lang="en-US">Intangible assets, net</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:to="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife_lbl" xml:lang="en-US">Estimated useful life</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear_lbl" xml:lang="en-US">June 30, 2026</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_lbl" xml:lang="en-US">June 30, 2027</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_lbl" xml:lang="en-US">June 30, 2028</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_lbl" xml:lang="en-US">June 30, 2029</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_lbl" xml:lang="en-US">June 30, 2030</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour" xlink:label="ATCH_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour" xlink:to="ATCH_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour_lbl" xml:lang="en-US">Thereafter</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentForAmortization" xlink:label="us-gaap_AdjustmentForAmortization" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentForAmortization" xlink:to="us-gaap_AdjustmentForAmortization_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentForAmortization_lbl" xml:lang="en-US">Amortization expense</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_lbl" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_lbl" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockVotingRights" xlink:label="us-gaap_CommonStockVotingRights" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockVotingRights" xlink:to="us-gaap_CommonStockVotingRights_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockVotingRights_lbl" xml:lang="en-US">Common stock, voting rights</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssuedPricePerShare" xlink:to="us-gaap_SharesIssuedPricePerShare_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SharesIssuedPricePerShare_3_lbl" xml:lang="en-US">Share price</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:to="us-gaap_DebtInstrumentConvertibleConversionPrice1_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPrice1_2_lbl" xml:lang="en-US">Conversion price floor</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleConversionPriceDecrease" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPriceDecrease" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentConvertibleConversionPriceDecrease" xlink:to="us-gaap_DebtInstrumentConvertibleConversionPriceDecrease_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPriceDecrease_lbl" xml:lang="en-US">Floor price decrease</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_StockIssuedDuringPeriodSharesConversionOfConvertibleNoteAndUnits" xlink:label="ATCH_StockIssuedDuringPeriodSharesConversionOfConvertibleNoteAndUnits" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesConversionOfConvertibleNoteAndUnits" xlink:to="ATCH_StockIssuedDuringPeriodSharesConversionOfConvertibleNoteAndUnits_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockIssuedDuringPeriodSharesConversionOfConvertibleNoteAndUnits_lbl" xml:lang="en-US">Number of shares issued</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesOther" xlink:to="us-gaap_StockIssuedDuringPeriodSharesOther_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesOther_2_lbl" xml:lang="en-US">Warrants issued, shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarrantsAndRightsOutstanding" xlink:label="us-gaap_WarrantsAndRightsOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantsAndRightsOutstanding" xlink:to="us-gaap_WarrantsAndRightsOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantsAndRightsOutstanding_lbl" xml:lang="en-US">Warrants outstanding</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightOutstanding" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfWarrantOrRightOutstanding" xlink:to="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xml:lang="en-US">Warrants exercised</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_3_lbl" xml:lang="en-US">Common stock shares</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodValueNewIssues_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_3_lbl" xml:lang="en-US">Common stock valued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xml:lang="en-US">Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xml:lang="en-US">Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xml:lang="en-US">Number of nonvested shares, outstanding balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted-average grant date fair value per share, balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xml:lang="en-US">Number of nonvested shares, granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted average grant date fair value per share, granted</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xml:lang="en-US">Number of nonvested shares, vested</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted average grant date fair value per share, vested</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xml:lang="en-US">Number of nonvested shares, forfeited</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xml:lang="en-US">Weighted average grant date fair value per share, forfeited</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2_lbl" xml:lang="en-US">Number of nonvested shares, outstanding balance</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2_lbl" xml:lang="en-US">Weighted-average grant date fair value per share, balance</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice" xlink:label="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice" xlink:to="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice_lbl" xml:lang="en-US">Volume weighted average price, balance</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_3_lbl" xml:lang="en-US">Weighted-average grant date fair value per share, balance</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xml:lang="en-US">Expected volatility</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xml:lang="en-US">Risk-free interest rate</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xml:lang="en-US">Expected term</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xml:lang="en-US">Expected dividend yield</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharePrice" xlink:label="us-gaap_SharePrice" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharePrice" xlink:to="us-gaap_SharePrice_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharePrice_lbl" xml:lang="en-US">Fair value per share (Tranche 5)</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AllocatedShareBasedCompensationExpense" xlink:to="us-gaap_AllocatedShareBasedCompensationExpense_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_2_lbl" xml:lang="en-US">Total stock-based compensation expense</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementExecutivesAnnualBaseSalariesEntitlements" xlink:label="ATCH_EmploymentAgreementExecutivesAnnualBaseSalariesEntitlements" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementExecutivesAnnualBaseSalariesEntitlements" xlink:to="ATCH_EmploymentAgreementExecutivesAnnualBaseSalariesEntitlements_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementExecutivesAnnualBaseSalariesEntitlements_lbl" xml:lang="en-US">[custom:EmploymentAgreementExecutivesAnnualBaseSalariesEntitlements]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EmploymentAgreementTerm" xlink:label="ATCH_EmploymentAgreementTerm" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementTerm" xlink:to="ATCH_EmploymentAgreementTerm_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EmploymentAgreementTerm_lbl" xml:lang="en-US">[custom:EmploymentAgreementTerm]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2_lbl" xml:lang="en-US">Granted shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_lbl" xml:lang="en-US">Additional shares</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_lbl" xml:lang="en-US">Grant date fair value</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAwardsEligibleToBeReceived" xlink:label="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAwardsEligibleToBeReceived" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAwardsEligibleToBeReceived" xlink:to="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAwardsEligibleToBeReceived_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAwardsEligibleToBeReceived_lbl" xml:lang="en-US">Award vesting period</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPerAwardPercent" xlink:label="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPerAwardPercent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPerAwardPercent" xlink:to="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPerAwardPercent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPerAwardPercent_lbl" xml:lang="en-US">Number of shares per award, percent</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice" xlink:to="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice_2_lbl" xml:lang="en-US">Weighted average trigger price</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_2_lbl" xml:lang="en-US">Award vesting period</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_2_lbl" xml:lang="en-US">Equity instruments other than options, vested in period</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xml:lang="en-US">Unrecognized compensation cost</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xml:lang="en-US">Weighted-average period</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable" xlink:label="us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable" xlink:to="us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable_lbl" xml:lang="en-US">Fair Value, off-Balance-Sheet Risk [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems" xlink:label="us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems" xlink:to="us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems_lbl" xml:lang="en-US">Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketableSecuritiesCurrent" xlink:label="us-gaap_MarketableSecuritiesCurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MarketableSecuritiesCurrent" xlink:to="us-gaap_MarketableSecuritiesCurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MarketableSecuritiesCurrent_lbl" xml:lang="en-US">Trading securities</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WinstonStrawnAgreementFairValueDisclosure" xlink:label="ATCH_WinstonStrawnAgreementFairValueDisclosure" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WinstonStrawnAgreementFairValueDisclosure" xlink:to="ATCH_WinstonStrawnAgreementFairValueDisclosure_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_WinstonStrawnAgreementFairValueDisclosure_lbl" xml:lang="en-US">Winston &amp; Strawn agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WarrantLiabilityPrivateWarrants" xlink:label="ATCH_WarrantLiabilityPrivateWarrants" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WarrantLiabilityPrivateWarrants" xlink:to="ATCH_WarrantLiabilityPrivateWarrants_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WarrantLiabilityPrivateWarrants_lbl" xml:lang="en-US">Warrant liability &#8211; Private Warrants</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EarnoutLiabilityNoncurrentLiabilityFairValueDisclosure" xlink:label="ATCH_EarnoutLiabilityNoncurrentLiabilityFairValueDisclosure" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnoutLiabilityNoncurrentLiabilityFairValueDisclosure" xlink:to="ATCH_EarnoutLiabilityNoncurrentLiabilityFairValueDisclosure_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EarnoutLiabilityNoncurrentLiabilityFairValueDisclosure_lbl" xml:lang="en-US">Earnout liability</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability" xlink:label="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability" xlink:to="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_lbl" xml:lang="en-US">Secured Convertible Note</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SharePurchaseCommitmentFairValueDisclosure" xlink:label="ATCH_SharePurchaseCommitmentFairValueDisclosure" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharePurchaseCommitmentFairValueDisclosure" xlink:to="ATCH_SharePurchaseCommitmentFairValueDisclosure_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SharePurchaseCommitmentFairValueDisclosure_lbl" xml:lang="en-US">Tau agreement</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WarrantLiabilityEquity" xlink:label="ATCH_WarrantLiabilityEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WarrantLiabilityEquity" xlink:to="ATCH_WarrantLiabilityEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WarrantLiabilityEquity_lbl" xml:lang="en-US">Warrant liability &#8211; Equity SPA</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl" xml:lang="en-US">Fair Value Measurement Inputs and Valuation Techniques [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_lbl" xml:lang="en-US">Fair Value Measurement Inputs and Valuation Techniques [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_SubscriptionAgreementMeasurementInput" xlink:label="ATCH_SubscriptionAgreementMeasurementInput" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SubscriptionAgreementMeasurementInput" xlink:to="ATCH_SubscriptionAgreementMeasurementInput_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_SubscriptionAgreementMeasurementInput_lbl" xml:lang="en-US">Subscription agreement measurement input</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarrantsAndRightsOutstandingMeasurementInput" xlink:label="us-gaap_WarrantsAndRightsOutstandingMeasurementInput" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantsAndRightsOutstandingMeasurementInput" xlink:to="us-gaap_WarrantsAndRightsOutstandingMeasurementInput_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantsAndRightsOutstandingMeasurementInput_lbl" xml:lang="en-US">Warrants and rights expiration date description</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_WarrantsAndRightsExpirationDateDescription" xlink:label="ATCH_WarrantsAndRightsExpirationDateDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WarrantsAndRightsExpirationDateDescription" xlink:to="ATCH_WarrantsAndRightsExpirationDateDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_WarrantsAndRightsExpirationDateDescription_lbl" xml:lang="en-US">Effective expiration date</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_EarnoutLiabilityMeasurementInput" xlink:label="ATCH_EarnoutLiabilityMeasurementInput" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnoutLiabilityMeasurementInput" xlink:to="ATCH_EarnoutLiabilityMeasurementInput_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_EarnoutLiabilityMeasurementInput_lbl" xml:lang="en-US">Earnout liability measurement input</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityMeasurementInput" xlink:label="us-gaap_DerivativeLiabilityMeasurementInput" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DerivativeLiabilityMeasurementInput" xlink:to="us-gaap_DerivativeLiabilityMeasurementInput_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DerivativeLiabilityMeasurementInput_lbl" xml:lang="en-US">Derivative liability measurement input</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantsAndRightsOutstandingTerm" xlink:to="us-gaap_WarrantsAndRightsOutstandingTerm_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_2_lbl" xml:lang="en-US">Term</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_DerivativeLiabilityExpirationDateDescription" xlink:label="ATCH_DerivativeLiabilityExpirationDateDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeLiabilityExpirationDateDescription" xlink:to="ATCH_DerivativeLiabilityExpirationDateDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_DerivativeLiabilityExpirationDateDescription_lbl" xml:lang="en-US">Effective expiration date</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CommitmentAmountMeasurementInput" xlink:label="ATCH_CommitmentAmountMeasurementInput" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommitmentAmountMeasurementInput" xlink:to="ATCH_CommitmentAmountMeasurementInput_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_CommitmentAmountMeasurementInput_lbl" xml:lang="en-US">Commitment amount measurement input</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CommitmentAmountExpirationDateDescription" xlink:label="ATCH_CommitmentAmountExpirationDateDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommitmentAmountExpirationDateDescription" xlink:to="ATCH_CommitmentAmountExpirationDateDescription_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_CommitmentAmountExpirationDateDescription_lbl" xml:lang="en-US">Effective expiration date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:to="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_lbl" xml:lang="en-US">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_lbl" xml:lang="en-US">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_lbl" xml:lang="en-US">Fair value as of December 31, 2025</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityWriteOff" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityWriteOff" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityWriteOff" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityWriteOff_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityWriteOff_lbl" xml:lang="en-US">Write of receivable</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_2_lbl" xml:lang="en-US">Change in valuation inputs or other assumptions</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_2_lbl" xml:lang="en-US">Fair value as of March 31, 2026</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_lbl" xml:lang="en-US">Initial measurement October 8, 2025</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransferredToEquity" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransferredToEquity" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransferredToEquity" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransferredToEquity_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransferredToEquity_lbl" xml:lang="en-US">Transfer to equity</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdvanceRequests" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdvanceRequests" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdvanceRequests" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdvanceRequests_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdvanceRequests_lbl" xml:lang="en-US">Fair value of advance requests</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityDerecognizedOnSettlement" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityDerecognizedOnSettlement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityDerecognizedOnSettlement" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityDerecognizedOnSettlement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityDerecognizedOnSettlement_lbl" xml:lang="en-US">Derecognized on settlement</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_lbl" xml:lang="en-US">Shares issued as partial payment</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExchanges" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExchanges" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExchanges" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExchanges_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExchanges_lbl" xml:lang="en-US">Exchange to Merger financing note</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_lbl" xml:lang="en-US">Principal amount</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_lbl" xml:lang="en-US">Day 1 fair value charge to earnings</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest_2_lbl" xml:lang="en-US">Accrued interest through March 31, 2026</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringOfFairValueOfWarrantsExercised" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringOfFairValueOfWarrantsExercised" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringOfFairValueOfWarrantsExercised" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringOfFairValueOfWarrantsExercised_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringOfFairValueOfWarrantsExercised_lbl" xml:lang="en-US">Fair value of warrants exercised</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:label="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_lbl" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:label="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_lbl" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossRelatedToLitigationSettlement" xlink:label="us-gaap_GainLossRelatedToLitigationSettlement" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainLossRelatedToLitigationSettlement" xlink:to="us-gaap_GainLossRelatedToLitigationSettlement_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GainLossRelatedToLitigationSettlement_lbl" xml:lang="en-US">Gain loss on settlement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability" xlink:to="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_2_lbl" xml:lang="en-US">Embedded derivative, fair value of embedded derivative liability</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:to="us-gaap_DebtInstrumentConvertibleConversionPrice1_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPrice1_3_lbl" xml:lang="en-US">Conversion price</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeNet" xlink:label="us-gaap_DerivativeFairValueOfDerivativeNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DerivativeFairValueOfDerivativeNet" xlink:to="us-gaap_DerivativeFairValueOfDerivativeNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DerivativeFairValueOfDerivativeNet_lbl" xml:lang="en-US">Fair value</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_InitialFairValueCommitmentAmount" xlink:label="ATCH_InitialFairValueCommitmentAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialFairValueCommitmentAmount" xlink:to="ATCH_InitialFairValueCommitmentAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_InitialFairValueCommitmentAmount_lbl" xml:lang="en-US">Commitment amount</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_InitialFairValueCommitmentFee" xlink:label="ATCH_InitialFairValueCommitmentFee" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialFairValueCommitmentFee" xlink:to="ATCH_InitialFairValueCommitmentFee_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_InitialFairValueCommitmentFee_lbl" xml:lang="en-US">Commitment fee</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeNet" xlink:label="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeNet" xlink:to="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeNet_lbl" xml:lang="en-US">Fair value of embedded derivatives</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:label="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:to="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_lbl" xml:lang="en-US">Issued and sale of shares</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharePrice" xlink:to="us-gaap_SharePrice_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_SharePrice_2_lbl" xml:lang="en-US">Share price</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_2_lbl" xml:lang="en-US">Fair value of warrants issued at issuance</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialValueOfWarrantsAllocatedForEquitySPA" xlink:to="ATCH_InitialValueOfWarrantsAllocatedForEquitySPA_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_InitialValueOfWarrantsAllocatedForEquitySPA_2_lbl" xml:lang="en-US">Fair value of warrants issued in units</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity" xlink:to="ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity_2_lbl" xml:lang="en-US">Warrant issued to placement agents</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_lbl" xml:lang="en-US">Transfers between the levels</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_RevenueFromStockLocateFees" xlink:label="ATCH_RevenueFromStockLocateFees" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RevenueFromStockLocateFees" xlink:to="ATCH_RevenueFromStockLocateFees_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ATCH_RevenueFromStockLocateFees_lbl" xml:lang="en-US">Stock locate fees</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingIncomeLoss" xlink:to="us-gaap_OperatingIncomeLoss_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingIncomeLoss_2_lbl" xml:lang="en-US">Loss from operations</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_Assets_2_lbl" xml:lang="en-US">Total assets</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments" xlink:label="us-gaap_NumberOfReportableSegments" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NumberOfReportableSegments" xlink:to="us-gaap_NumberOfReportableSegments_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xml:lang="en-US">Reportable segment</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTable" xlink:label="us-gaap_SubsequentEventTable" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventTable" xlink:to="us-gaap_SubsequentEventTable_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventTable_lbl" xml:lang="en-US">Subsequent Event [Table]</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventLineItems" xlink:label="us-gaap_SubsequentEventLineItems" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventLineItems" xlink:to="us-gaap_SubsequentEventLineItems_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventLineItems_lbl" xml:lang="en-US">Subsequent Event [Line Items]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:to="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_3_lbl" xml:lang="en-US">Shares issued</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFeeAmount" xlink:label="us-gaap_DebtInstrumentFeeAmount" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentFeeAmount" xlink:to="us-gaap_DebtInstrumentFeeAmount_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentFeeAmount_lbl" xml:lang="en-US">Monthly fee</link:label>
      <link:loc xlink:type="locator" xlink:href="atch-20260331.xsd#ATCH_CommonStockPercentage" xlink:label="ATCH_CommonStockPercentage" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommonStockPercentage" xlink:to="ATCH_CommonStockPercentage_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_CommonStockPercentage_lbl" xml:lang="en-US">Common stock percentage</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrentAndNoncurrent" xlink:label="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent" xlink:to="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent_lbl" xml:lang="en-US">Accrued expenses</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashSegregatedProprietaryAccountsOfBrokerDealers" xlink:to="ATCH_CashSegregatedProprietaryAccountsOfBrokerDealers_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CashSegregatedProprietaryAccountsOfBrokerDealers_doc" xml:lang="en-US">Represents information pertaining to cash segregated for Proprietary Accounts of Broker-Dealers (PAB).</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PacsquareAssetsProprietarySoftwareMember" xlink:to="ATCH_PacsquareAssetsProprietarySoftwareMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PacsquareAssetsProprietarySoftwareMember_doc" xml:lang="en-US">Pacsquare Assets Proprietary Software [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashSegregatedCustomers" xlink:to="ATCH_CashSegregatedCustomers_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CashSegregatedCustomers_doc" xml:lang="en-US">Represents information pertaining to cash segregated for customers.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommercialBankAcquisitionDeposit" xlink:to="ATCH_CommercialBankAcquisitionDeposit_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CommercialBankAcquisitionDeposit_doc" xml:lang="en-US">Amount of Commercial bank acquisition deposit.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AccountsAndPayablesToOfficersAndDirectorsCurrent" xlink:to="ATCH_AccountsAndPayablesToOfficersAndDirectorsCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_AccountsAndPayablesToOfficersAndDirectorsCurrent_doc" xml:lang="en-US">The amount of accounts and payables to officers and directors, classified as current.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommissionsPayrollAndPayrollTaxesCurrent" xlink:to="ATCH_CommissionsPayrollAndPayrollTaxesCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CommissionsPayrollAndPayrollTaxesCurrent_doc" xml:lang="en-US">The amount of payables for commissions, payroll and payroll taxes, classified as current.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LongTermMergerFinancingCurrent" xlink:to="ATCH_LongTermMergerFinancingCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_LongTermMergerFinancingCurrent_doc" xml:lang="en-US">Carrying value as of the balance sheet date of the current portion of long-term merger financing (with maturities initially due after one year or beyond the operating cycle if longer).</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingPayable" xlink:to="ATCH_MergerFinancingPayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_MergerFinancingPayable_doc" xml:lang="en-US">Represents the liability for amounts due under financing arrangements entered into to fund a merger, excluding derivative features.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiabilityCurrent" xlink:to="ATCH_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiabilityCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiabilityCurrent_doc" xml:lang="en-US">Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability, maturing within one year or operating cycle, if longer.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharePurchaseCommitmentAmountCurrent" xlink:to="ATCH_SharePurchaseCommitmentAmountCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SharePurchaseCommitmentAmountCurrent_doc" xml:lang="en-US">Amount of share purchase commitment amount classified as current.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebentureCurrent" xlink:to="ATCH_DebentureCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebentureCurrent_doc" xml:lang="en-US">Amount of debenture issued classified that are expected to be paid during the following twelve months or within one business cycle, if longer.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LesseeOperatingLeasesOtherInformationTableTextBlock" xlink:to="ATCH_LesseeOperatingLeasesOtherInformationTableTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_LesseeOperatingLeasesOtherInformationTableTextBlock_doc" xml:lang="en-US">Lessee Operating Leases Other Information [Table Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WinstonStrawnAgreementCurrent" xlink:to="ATCH_WinstonStrawnAgreementCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WinstonStrawnAgreementCurrent_doc" xml:lang="en-US">Amount of winston strawn agreement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPayableCurrent" xlink:to="ATCH_StockPayableCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockPayableCurrent_doc" xml:lang="en-US">Carrying value as of the balance sheet date of stock payable that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WarrantsLiabilitiesNonCurrent" xlink:to="ATCH_WarrantsLiabilitiesNonCurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WarrantsLiabilitiesNonCurrent_doc" xml:lang="en-US">Warrants liabilities non current.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnoutLiabilitiesNoncurrent" xlink:to="ATCH_EarnoutLiabilitiesNoncurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EarnoutLiabilitiesNoncurrent_doc" xml:lang="en-US">The amount of earnout liabilities of the entity classified as current.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TradingAccountDepositNoncurrent" xlink:to="ATCH_TradingAccountDepositNoncurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TradingAccountDepositNoncurrent_doc" xml:lang="en-US">The amount of trading account deposit liabilities, classified as noncurrent</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour" xlink:to="ATCH_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour_doc" xml:lang="en-US">Finite lived intangible assets amortization expense after year four.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability" xlink:to="ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_RightOfUseAssetObtainedExchangeForOperatingLeaseLiability_doc" xml:lang="en-US">Right of use asset obtained exchange for operating lease liability</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_OperatingLeaseRightOfUseAssetEndingBalance" xlink:to="ATCH_OperatingLeaseRightOfUseAssetEndingBalance_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_OperatingLeaseRightOfUseAssetEndingBalance_doc" xml:lang="en-US">Operating Lease Right Of Use Asset Ending Balance</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_AtlasFintechMember_doc" xml:lang="en-US">Atlas Fintech [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SellerNotesMember_doc" xml:lang="en-US">Seller Notes [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SponsorMember" xlink:to="ATCH_SponsorMember_doc" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_QuantumVenturesLLCMember_doc" xml:lang="en-US">Quantum Ventures LLC [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DueToRelatedParties_doc" xml:lang="en-US">Due to related parties.</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SixthBoroughCapitalFundLpMember_doc" xml:lang="en-US">Sixth Borough Capital Fund Lp [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_GeneralCounselAndChiefFinancialOfficerMember_doc" xml:lang="en-US">General Counsel And Chief Financial Officer [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SandipPatelMember_doc" xml:lang="en-US">Sandip Patel [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_AtlasclearInc.Member_doc" xml:lang="en-US">Atlasclear Inc [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnOutSharesMaximumNumberOfSharesIssuable" xlink:to="ATCH_EarnOutSharesMaximumNumberOfSharesIssuable_doc" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EarnOutSharesMaximumAmountOfSharesIssuable_doc" xml:lang="en-US">Earn out shares maximum amount of shares issuable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PeriodForMeasurementOfRevenueTargets" xlink:to="ATCH_PeriodForMeasurementOfRevenueTargets_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PeriodForMeasurementOfRevenueTargets_doc" xml:lang="en-US">Period for measurement of revenue targets.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementTermOfEmployment" xlink:to="ATCH_EmploymentAgreementTermOfEmployment_doc" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmploymentAgreementTermOfRenewal_doc" xml:lang="en-US">Employment agreement term of renewal.</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmploymentAgreementAnnualBaseSalaryYearTwo_doc" xml:lang="en-US">Employment agreement annual base salary year two.</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmploymentAgreementAnnualBaseSalaryYearThree_doc" xml:lang="en-US">Employment agreement annual base salary year three.</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmploymentAgreementAnnualBaseSalaryYearOne_doc" xml:lang="en-US">Employment agreement annual base salary year one.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementThresholdPeriodOfWrittenNoticeOfNonRenewal" xlink:to="ATCH_EmploymentAgreementThresholdPeriodOfWrittenNoticeOfNonRenewal_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmploymentAgreementThresholdPeriodOfWrittenNoticeOfNonRenewal_doc" xml:lang="en-US">Employment agreement threshold period of written notice of non renewal.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PercentageOfBonusPayable" xlink:to="ATCH_PercentageOfBonusPayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PercentageOfBonusPayable_doc" xml:lang="en-US">Percentage of bonus payable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PayableImmediatelyMember" xlink:to="ATCH_PayableImmediatelyMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PayableImmediatelyMember_doc" xml:lang="en-US">Payable Immediately [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PercentageOfBonusPayableFirstQuarter" xlink:to="ATCH_PercentageOfBonusPayableFirstQuarter_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PercentageOfBonusPayableFirstQuarter_doc" xml:lang="en-US">Percentage of bonus payable first quarter.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PayableAtEndOfFirstQuarter2026Member" xlink:to="ATCH_PayableAtEndOfFirstQuarter2026Member_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PayableAtEndOfFirstQuarter2026Member_doc" xml:lang="en-US">Payable At End Of First Quarter 2026 [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MinimumQualifiedCumulativeFinancingAmount" xlink:to="ATCH_MinimumQualifiedCumulativeFinancingAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_MinimumQualifiedCumulativeFinancingAmount_doc" xml:lang="en-US">Minimum qualified cumulative financing amount.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementStockGrants" xlink:to="ATCH_EmploymentAgreementStockGrants_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmploymentAgreementStockGrants_doc" xml:lang="en-US">Employment agreement stock grants.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_GrantedOnSigningMember" xlink:to="ATCH_GrantedOnSigningMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_GrantedOnSigningMember_doc" xml:lang="en-US">Granted On Signing [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_GrantedOnJuly12026Member" xlink:to="ATCH_GrantedOnJuly12026Member_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_GrantedOnJuly12026Member_doc" xml:lang="en-US">Granted On July 1 2026 [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ThresholdPercentageOfOutstandingSharesForDeterminingStockAward" xlink:to="ATCH_ThresholdPercentageOfOutstandingSharesForDeterminingStockAward_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ThresholdPercentageOfOutstandingSharesForDeterminingStockAward_doc" xml:lang="en-US">Threshold percentage of outstanding shares for determining stock award.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementNumberOfStockAwards" xlink:to="ATCH_EmploymentAgreementNumberOfStockAwards_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmploymentAgreementNumberOfStockAwards_doc" xml:lang="en-US">Employment agreement number of stock awards.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WeightedAveragePrice" xlink:to="ATCH_WeightedAveragePrice_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WeightedAveragePrice_doc" xml:lang="en-US">Weighted average price.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPriceMilestoneOneMember" xlink:to="ATCH_StockPriceMilestoneOneMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockPriceMilestoneOneMember_doc" xml:lang="en-US">Stock Price Milestone One [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPriceMilestoneTwoMember" xlink:to="ATCH_StockPriceMilestoneTwoMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockPriceMilestoneTwoMember_doc" xml:lang="en-US">Stock Price Milestone Two [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPriceMilestoneThreeMember" xlink:to="ATCH_StockPriceMilestoneThreeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockPriceMilestoneThreeMember_doc" xml:lang="en-US">Stock Price Milestone Three [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPriceMilestoneFourMember" xlink:to="ATCH_StockPriceMilestoneFourMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockPriceMilestoneFourMember_doc" xml:lang="en-US">Stock Price Milestone Four [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPriceMilestoneFiveMember" xlink:to="ATCH_StockPriceMilestoneFiveMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockPriceMilestoneFiveMember_doc" xml:lang="en-US">Stock Price Milestone Five [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmploymentAgreementOneTimeSignInBonusPaid_doc" xml:lang="en-US">Employment agreement one time sign in bonus paid.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WilsonDavisCoIncMember" xlink:to="ATCH_WilsonDavisCoIncMember_doc" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LossContingencyReductionInDamageAwarded" xlink:to="ATCH_LossContingencyReductionInDamageAwarded_doc" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ServicesLicenseAgreementMember_doc" xml:lang="en-US">Services License Agreement [Member]</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_VendorMember" xlink:to="ATCH_VendorMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_VendorMember_doc" xml:lang="en-US">Vendor [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesConversionOfConvertibleNoteAndUnits" xlink:to="ATCH_StockIssuedDuringPeriodSharesConversionOfConvertibleNoteAndUnits_doc" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_InvestorWarrantsMember_doc" xml:lang="en-US">Investor Warrants [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PlacementAgentWarrantsMember" xlink:to="ATCH_PlacementAgentWarrantsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PlacementAgentWarrantsMember_doc" xml:lang="en-US">Placement Agent Warrants [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PublicWarrantsMember" xlink:to="ATCH_PublicWarrantsMember_doc" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PrivateWarrantsMember" xlink:to="ATCH_PrivateWarrantsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PrivateWarrantsMember_doc" xml:lang="en-US">Private Warrants [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SecuredConvertibleNoteWarrantsMember" xlink:to="ATCH_SecuredConvertibleNoteWarrantsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SecuredConvertibleNoteWarrantsMember_doc" xml:lang="en-US">Secured Convertible Note Warrants [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingDerivative" xlink:to="ATCH_MergerFinancingDerivative_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_MergerFinancingDerivative_doc" xml:lang="en-US">Merger financing derivative</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeLiabilityDebenture" xlink:to="ATCH_DerivativeLiabilityDebenture_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DerivativeLiabilityDebenture_doc" xml:lang="en-US">Tau agreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNoteDerivative" xlink:to="ATCH_ConvertibleNoteDerivative_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ConvertibleNoteDerivative_doc" xml:lang="en-US">Convertible note derivative</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ChardanNoteMember" xlink:to="ATCH_ChardanNoteMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ChardanNoteMember_doc" xml:lang="en-US">Chardan Note [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionOriginalDebtPrincipalAmount" xlink:to="ATCH_DebtConversionOriginalDebtPrincipalAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebtConversionOriginalDebtPrincipalAmount_doc" xml:lang="en-US">The amount of the original principal debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtInstrumentConvertibleConversionRateAsPercentageOfSpecifiedTradingDaysVolumeWeightedAverageSharePrice" xlink:to="ATCH_DebtInstrumentConvertibleConversionRateAsPercentageOfSpecifiedTradingDaysVolumeWeightedAverageSharePrice_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebtInstrumentConvertibleConversionRateAsPercentageOfSpecifiedTradingDaysVolumeWeightedAverageSharePrice_doc" xml:lang="en-US">Debt instrument convertible conversion rate as percentage of specified trading days volume weighted average share price.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FunicularNoteMember" xlink:to="ATCH_FunicularNoteMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FunicularNoteMember_doc" xml:lang="en-US">Funicular Note [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementExecutivesAnnualBaseSalariesEntitlements" xlink:to="ATCH_EmploymentAgreementExecutivesAnnualBaseSalariesEntitlements_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmploymentAgreementExecutivesAnnualBaseSalariesEntitlements_doc" xml:lang="en-US">Employmen tagreement executives annual base salariesen titlements.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockTransferredDuringPeriodByRelatedPartySharesConversionOfConvertibleSecuritiesInterest" xlink:to="ATCH_StockTransferredDuringPeriodByRelatedPartySharesConversionOfConvertibleSecuritiesInterest_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartySharesConversionOfConvertibleSecuritiesInterest_doc" xml:lang="en-US">Stock transferred during period by related party shares conversion of convertible securities interest.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionConvertedInstrumentAmountConversionOfInterestOfConvertibleNotes" xlink:to="ATCH_DebtConversionConvertedInstrumentAmountConversionOfInterestOfConvertibleNotes_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebtConversionConvertedInstrumentAmountConversionOfInterestOfConvertibleNotes_doc" xml:lang="en-US">Debt conversion converted instrument amount conversion of interest of convertible notes.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmploymentAgreementTerm" xlink:to="ATCH_EmploymentAgreementTerm_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmploymentAgreementTerm_doc" xml:lang="en-US">:Employment agreement term.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TimeBasedStockAwardsMember" xlink:to="ATCH_TimeBasedStockAwardsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TimeBasedStockAwardsMember_doc" xml:lang="en-US">Time Based Stock Awards [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtInstrumentInterestRateInEventOfDefault" xlink:to="ATCH_DebtInstrumentInterestRateInEventOfDefault_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebtInstrumentInterestRateInEventOfDefault_doc" xml:lang="en-US">Debt instrument interest rate in event of default.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice" xlink:to="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsVolumeWeightedAverageTriggerPrice_doc" xml:lang="en-US">Share based compensation arrangement by share based payment award grants volume weighted average trigger price.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardMember" xlink:to="ATCH_PerformanceBasedStockAwardMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PerformanceBasedStockAwardMember_doc" xml:lang="en-US">Performance Based Stock Award [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TrancheOneMember" xlink:to="ATCH_TrancheOneMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TrancheOneMember_doc" xml:lang="en-US">Tranche One [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TrancheTwoMember" xlink:to="ATCH_TrancheTwoMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TrancheTwoMember_doc" xml:lang="en-US">Tranche Two [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TrancheThreeMember" xlink:to="ATCH_TrancheThreeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TrancheThreeMember_doc" xml:lang="en-US">Tranche Three [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TrancheFourMember" xlink:to="ATCH_TrancheFourMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TrancheFourMember_doc" xml:lang="en-US">Tranche Four [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TrancheFiveMember" xlink:to="ATCH_TrancheFiveMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TrancheFiveMember_doc" xml:lang="en-US">Tranche Five [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TransactionCost" xlink:to="ATCH_TransactionCost_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TransactionCost_doc" xml:lang="en-US">Transaction cost.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAwardsEligibleToBeReceived" xlink:to="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAwardsEligibleToBeReceived_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAwardsEligibleToBeReceived_doc" xml:lang="en-US">Share based compensation arrangement by share based payment award number of awards eligible to be received.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPerAwardPercent" xlink:to="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPerAwardPercent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPerAwardPercent_doc" xml:lang="en-US">Share based compensation arrangement by share based payment award number of shares per award percent.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ExecutiveChairmanMember" xlink:to="ATCH_ExecutiveChairmanMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ExecutiveChairmanMember_doc" xml:lang="en-US">Executive Chairman [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardOneMember" xlink:to="ATCH_PerformanceBasedStockAwardOneMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PerformanceBasedStockAwardOneMember_doc" xml:lang="en-US">Performance Based Stock Award One [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardTwoMember" xlink:to="ATCH_PerformanceBasedStockAwardTwoMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PerformanceBasedStockAwardTwoMember_doc" xml:lang="en-US">Performance Based Stock Award Two [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardThreeMember" xlink:to="ATCH_PerformanceBasedStockAwardThreeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PerformanceBasedStockAwardThreeMember_doc" xml:lang="en-US">Performance Based Stock Award Three [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardFourMember" xlink:to="ATCH_PerformanceBasedStockAwardFourMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PerformanceBasedStockAwardFourMember_doc" xml:lang="en-US">Performance Based Stock Award Four [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PerformanceBasedStockAwardFiveMember" xlink:to="ATCH_PerformanceBasedStockAwardFiveMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PerformanceBasedStockAwardFiveMember_doc" xml:lang="en-US">Performance Based Stock Award Five [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAccruedInterest_doc" xml:lang="en-US">Fair value measurement with unobservable inputs reconciliation recurring basis liability accrued interest.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WilsonDavisSellersMember" xlink:to="ATCH_WilsonDavisSellersMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WilsonDavisSellersMember_doc" xml:lang="en-US">Wilson Davis Sellers [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ScheduleOfShareBasedPaymentAwardPerformanceSharesValuationAssumptionsTableTextBlock" xlink:to="ATCH_ScheduleOfShareBasedPaymentAwardPerformanceSharesValuationAssumptionsTableTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ScheduleOfShareBasedPaymentAwardPerformanceSharesValuationAssumptionsTableTextBlock_doc" xml:lang="en-US">Schedule of Share Based Payment Award Performance Shares Valuation Assumptions [Table Text Block]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_IndividualAdvancesRequestedThresholdTradingDays" xlink:to="ATCH_IndividualAdvancesRequestedThresholdTradingDays_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_IndividualAdvancesRequestedThresholdTradingDays_doc" xml:lang="en-US">Individual advances requested threshold trading days.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ShortTermSellerNotesMember" xlink:to="ATCH_ShortTermSellerNotesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ShortTermSellerNotesMember_doc" xml:lang="en-US">Short Term Seller Notes [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WinstonStrawnAgreementFairValueDisclosure" xlink:to="ATCH_WinstonStrawnAgreementFairValueDisclosure_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WinstonStrawnAgreementFairValueDisclosure_doc" xml:lang="en-US">Winston Strawn agreement fair value disclosure.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WarrantLiabilityPrivateWarrants" xlink:to="ATCH_WarrantLiabilityPrivateWarrants_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WarrantLiabilityPrivateWarrants_doc" xml:lang="en-US">Warrant liability private warrants.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnoutLiabilityNoncurrentLiabilityFairValueDisclosure" xlink:to="ATCH_EarnoutLiabilityNoncurrentLiabilityFairValueDisclosure_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EarnoutLiabilityNoncurrentLiabilityFairValueDisclosure_doc" xml:lang="en-US">Earnout liability non current liability fair value disclosure.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharePurchaseCommitmentFairValueDisclosure" xlink:to="ATCH_SharePurchaseCommitmentFairValueDisclosure_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SharePurchaseCommitmentFairValueDisclosure_doc" xml:lang="en-US">Share purchase commitment fair value disclosure.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WarrantLiabilityEquity" xlink:to="ATCH_WarrantLiabilityEquity_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WarrantLiabilityEquity_doc" xml:lang="en-US">Warrant liability equity.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LongTermSellerNotesMember" xlink:to="ATCH_LongTermSellerNotesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_LongTermSellerNotesMember_doc" xml:lang="en-US">Long Term Seller Notes [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SettlementWinstonAndStrawnAgreementMember" xlink:to="ATCH_SettlementWinstonAndStrawnAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SettlementWinstonAndStrawnAgreementMember_doc" xml:lang="en-US">Settlement Winston And Strawn Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SubscriptionAgreementMeasurementInput" xlink:to="ATCH_SubscriptionAgreementMeasurementInput_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SubscriptionAgreementMeasurementInput_doc" xml:lang="en-US">Subscription agreement measurement input.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PreReverseSplitMember" xlink:to="ATCH_PreReverseSplitMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PreReverseSplitMember_doc" xml:lang="en-US">Pre Reverse Split [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_JonesTradingNoteMember" xlink:to="ATCH_JonesTradingNoteMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_JonesTradingNoteMember_doc" xml:lang="en-US">Jones Trading Note [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RevenueFromVettingProcessingFees" xlink:to="ATCH_RevenueFromVettingProcessingFees_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_RevenueFromVettingProcessingFees_doc" xml:lang="en-US">Amount of revenue that is derived from the vetting fees.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RevenueFromClearanceFees" xlink:to="ATCH_RevenueFromClearanceFees_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_RevenueFromClearanceFees_doc" xml:lang="en-US">Amount of revenue that is derived from the clearing fees.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DataProcessingAndClearingCosts" xlink:to="ATCH_DataProcessingAndClearingCosts_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DataProcessingAndClearingCosts_doc" xml:lang="en-US">The amount of expenses incurred in the period for data processing and clearing costs.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RegulatoryProfessionalFeesAndRelatedExpenses" xlink:to="ATCH_RegulatoryProfessionalFeesAndRelatedExpenses_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_RegulatoryProfessionalFeesAndRelatedExpenses_doc" xml:lang="en-US">The amount of expenses incurred in the period for regulatory, professional fees and related expenses.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WarrantsAndRightsExpirationDateDescription" xlink:to="ATCH_WarrantsAndRightsExpirationDateDescription_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WarrantsAndRightsExpirationDateDescription_doc" xml:lang="en-US">Warrants and rights expiration date description.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TransferFees" xlink:to="ATCH_TransferFees_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TransferFees_doc" xml:lang="en-US">The amount of expenses incurred in the period for transfer fees.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_BankCharges" xlink:to="ATCH_BankCharges_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_BankCharges_doc" xml:lang="en-US">The amount of expenses incurred in the period for bank charges.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeGainLossOnConvertibleNoteDerivativeNet" xlink:to="ATCH_DerivativeGainLossOnConvertibleNoteDerivativeNet_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DerivativeGainLossOnConvertibleNoteDerivativeNet_doc" xml:lang="en-US">Amount of increase (decrease) in the fair value of convertible notes derivatives recognized in the income statement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet" xlink:to="ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DerivativeGainLossOnLongTermAndShortTermNoteDerivativeNet_doc" xml:lang="en-US">Amount of increase (decrease) in the fair value of long-tem and short-term notes derivatives recognized in the income statement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfContingentGuarantee" xlink:to="ATCH_FairValueAdjustmentOfContingentGuarantee_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueAdjustmentOfContingentGuarantee_doc" xml:lang="en-US">Amount of expense (income) related to adjustment to fair value of contingent guarantee.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount" xlink:to="ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EffectiveIncomeTaxRateReconciliationChangeInFairValueOfSecuredConvertibleNoteAmount_doc" xml:lang="en-US">Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in fair value of secured convertible note.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmbeddedDerivativeGainLossOnMergerFinancing" xlink:to="ATCH_EmbeddedDerivativeGainLossOnMergerFinancing_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmbeddedDerivativeGainLossOnMergerFinancing_doc" xml:lang="en-US">Amount of increase (decrease) in the fair value of embedded derivative relating to merger financing recognized in the income statement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfEarnoutLiability" xlink:to="ATCH_FairValueAdjustmentOfEarnoutLiability_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueAdjustmentOfEarnoutLiability_doc" xml:lang="en-US">Amount of expense (income) related to adjustment to fair value of earnout liability.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfWinstonStrawnAgreement" xlink:to="ATCH_FairValueAdjustmentOfWinstonStrawnAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueAdjustmentOfWinstonStrawnAgreement_doc" xml:lang="en-US">Amount of expense (income) related to adjustment to fair value of winston strawn agreement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EmbeddedDerivativeGainLossOnDebenture" xlink:to="ATCH_EmbeddedDerivativeGainLossOnDebenture_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EmbeddedDerivativeGainLossOnDebenture_doc" xml:lang="en-US">Amount of increase (decrease) in the fair value of embedded derivative relating to debenture recognized in the income statement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount" xlink:to="ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueAdjustmentOfSharePurchaseCommitmentAmount_doc" xml:lang="en-US">Amount of expense (income) related to adjustment to share purchase commitment amount.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfStockPayable" xlink:to="ATCH_FairValueAdjustmentOfStockPayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueAdjustmentOfStockPayable_doc" xml:lang="en-US">Amount of expense (income) related to adjustment to fair value of stock payable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LossOnSettlementOnWinstonStrawnAgreement" xlink:to="ATCH_LossOnSettlementOnWinstonStrawnAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_LossOnSettlementOnWinstonStrawnAgreement_doc" xml:lang="en-US">Loss On Settlement On Winston Strawn Agreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnoutLiabilityMeasurementInput" xlink:to="ATCH_EarnoutLiabilityMeasurementInput_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EarnoutLiabilityMeasurementInput_doc" xml:lang="en-US">Earn out liability measurement input.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LongTermNotesMember" xlink:to="ATCH_LongTermNotesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_LongTermNotesMember_doc" xml:lang="en-US">Long Term Notes [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LongTermNotesAndChardanNoteMember" xlink:to="ATCH_LongTermNotesAndChardanNoteMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_LongTermNotesAndChardanNoteMember_doc" xml:lang="en-US">Long Term Notes And Chardan Note [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AmortizationOfDebtDiscount" xlink:to="ATCH_AmortizationOfDebtDiscount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_AmortizationOfDebtDiscount_doc" xml:lang="en-US">Amortization of debt discount</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SecuredConvertibleNoteMember" xlink:to="ATCH_SecuredConvertibleNoteMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SecuredConvertibleNoteMember_doc" xml:lang="en-US">Secured Convertible Note [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionOriginalDebtAmountContingentGuarantee" xlink:to="ATCH_DebtConversionOriginalDebtAmountContingentGuarantee_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebtConversionOriginalDebtAmountContingentGuarantee_doc" xml:lang="en-US">Debt conversion original debt amount contingent guarantee.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingConvertibleNoteNoncurrent" xlink:to="ATCH_MergerFinancingConvertibleNoteNoncurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_MergerFinancingConvertibleNoteNoncurrent_doc" xml:lang="en-US">Merger financing convertible note non current.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_UnamortizedDiscountPremiumContingentGuarantee" xlink:to="ATCH_UnamortizedDiscountPremiumContingentGuarantee_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_UnamortizedDiscountPremiumContingentGuarantee_doc" xml:lang="en-US">Unamortized discount premium contingent guarantee.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AmortizationOfDebtDiscountPremiumContingentGuarantee" xlink:to="ATCH_AmortizationOfDebtDiscountPremiumContingentGuarantee_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_AmortizationOfDebtDiscountPremiumContingentGuarantee_doc" xml:lang="en-US">Amortization of debt discount premium contingent guarantee.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InterestOnContingentGuarantee" xlink:to="ATCH_InterestOnContingentGuarantee_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_InterestOnContingentGuarantee_doc" xml:lang="en-US">Interest on contingent guarantee.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesToBeIssuedAmount" xlink:to="ATCH_SharesToBeIssuedAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SharesToBeIssuedAmount_doc" xml:lang="en-US">Shares to be issued amount.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SaleOfSharesUnderSharePurchaseAgreement" xlink:to="ATCH_SaleOfSharesUnderSharePurchaseAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SaleOfSharesUnderSharePurchaseAgreement_doc" xml:lang="en-US">Sale of shares under share purchase agreement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPurchasedDuringPeriodSharesSharePurchaseAgreement" xlink:to="ATCH_StockPurchasedDuringPeriodSharesSharePurchaseAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockPurchasedDuringPeriodSharesSharePurchaseAgreement_doc" xml:lang="en-US">Stock purchased during period shares share purchase agreement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockLocateExpense" xlink:to="ATCH_StockLocateExpense_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockLocateExpense_doc" xml:lang="en-US">Stock locate expense</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesAvailableUnderSharePurchaseAgreement" xlink:to="ATCH_SharesAvailableUnderSharePurchaseAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SharesAvailableUnderSharePurchaseAgreement_doc" xml:lang="en-US">Shares available under share purchase agreement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingNoteMember" xlink:to="ATCH_MergerFinancingNoteMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_MergerFinancingNoteMember_doc" xml:lang="en-US">Merger Financing Note [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeLiabilityExpirationDateDescription" xlink:to="ATCH_DerivativeLiabilityExpirationDateDescription_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DerivativeLiabilityExpirationDateDescription_doc" xml:lang="en-US">Derivative liability expiration date description.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SubscriptionReceivableMember" xlink:to="ATCH_SubscriptionReceivableMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SubscriptionReceivableMember_doc" xml:lang="en-US">Subscription Receivable [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialFairValueCommitmentAmount" xlink:to="ATCH_InitialFairValueCommitmentAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_InitialFairValueCommitmentAmount_doc" xml:lang="en-US">Initial fair value commitment amount.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TauAgreementMember" xlink:to="ATCH_TauAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TauAgreementMember_doc" xml:lang="en-US">Tau Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialFairValueCommitmentFee" xlink:to="ATCH_InitialFairValueCommitmentFee_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_InitialFairValueCommitmentFee_doc" xml:lang="en-US">Initial fair value commitment fee.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingMember" xlink:to="ATCH_MergerFinancingMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_MergerFinancingMember_doc" xml:lang="en-US">Merger Financing [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommitmentAmountMeasurementInput" xlink:to="ATCH_CommitmentAmountMeasurementInput_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CommitmentAmountMeasurementInput_doc" xml:lang="en-US">Commitment amount measurement input.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionsOriginalDebtInterestAmount" xlink:to="ATCH_DebtConversionsOriginalDebtInterestAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebtConversionsOriginalDebtInterestAmount_doc" xml:lang="en-US">Debt conversions original debt interest amount.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommitmentAmountExpirationDateDescription" xlink:to="ATCH_CommitmentAmountExpirationDateDescription_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CommitmentAmountExpirationDateDescription_doc" xml:lang="en-US">Commitment amount expiration date description.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_NumberOfSharesIssuableUponDebtConversion" xlink:to="ATCH_NumberOfSharesIssuableUponDebtConversion_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_NumberOfSharesIssuableUponDebtConversion_doc" xml:lang="en-US">Number of shares issuable upon debt conversion.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebentureMember" xlink:to="ATCH_DebentureMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebentureMember_doc" xml:lang="en-US">Debenture [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueIssuedForSoftwareAsServiceUnderLicenseAgreement" xlink:to="ATCH_StockIssuedDuringPeriodValueIssuedForSoftwareAsServiceUnderLicenseAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodValueIssuedForSoftwareAsServiceUnderLicenseAgreement_doc" xml:lang="en-US">The number of shares issued in lieu of cash for software as services under license agreement contributed to the entity.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodShareIssuedForSoftwareAsServiceUnderLicenseAgreement" xlink:to="ATCH_StockIssuedDuringPeriodShareIssuedForSoftwareAsServiceUnderLicenseAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodShareIssuedForSoftwareAsServiceUnderLicenseAgreement_doc" xml:lang="en-US">Value of stock issued in lieu of cash for software as services under license agreement contributed to the entity.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueIssuedForConsultingServices" xlink:to="ATCH_StockIssuedDuringPeriodValueIssuedForConsultingServices_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodValueIssuedForConsultingServices_doc" xml:lang="en-US">Value of stock issued in lieu of cash for consulting services contributed to the entity.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodShareIssuedForConsultingServices" xlink:to="ATCH_StockIssuedDuringPeriodShareIssuedForConsultingServices_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodShareIssuedForConsultingServices_doc" xml:lang="en-US">The number of stock issued in lieu of cash for consulting services contributed to the entity.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueSettledVendorObligation" xlink:to="ATCH_StockIssuedDuringPeriodValueSettledVendorObligation_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodValueSettledVendorObligation_doc" xml:lang="en-US">Value of stock issued for settled vendor obligations.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesSettledVendorObligation" xlink:to="ATCH_StockIssuedDuringPeriodSharesSettledVendorObligation_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodSharesSettledVendorObligation_doc" xml:lang="en-US">Number of shares issued for settled vendor obligations.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SecuritiesPurchaseAgreementMember" xlink:to="ATCH_SecuritiesPurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SecuritiesPurchaseAgreementMember_doc" xml:lang="en-US">Securities Purchase Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TwoThousandTwentyFiveWarrantLiabilityMember" xlink:to="ATCH_TwoThousandTwentyFiveWarrantLiabilityMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TwoThousandTwentyFiveWarrantLiabilityMember_doc" xml:lang="en-US">Two Thousand Twenty Five Warrant Liability [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialValueOfWarrantsAllocatedForEquitySPA" xlink:to="ATCH_InitialValueOfWarrantsAllocatedForEquitySPA_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_InitialValueOfWarrantsAllocatedForEquitySPA_doc" xml:lang="en-US">Initial value of warrants allocated for Equity SPA.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity" xlink:to="ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_InitialValueOfWarrantIssuedAsTransactionCostUnderEquity_doc" xml:lang="en-US">Initial value of warrant issued as transaction cost under equity.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueToWinstonStrawnAsPartialPaymentInSettlementAgreement" xlink:to="ATCH_StockIssuedDuringPeriodValueToWinstonStrawnAsPartialPaymentInSettlementAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodValueToWinstonStrawnAsPartialPaymentInSettlementAgreement_doc" xml:lang="en-US">Stock issued during period value to winston strawn as partial payment in settlement agreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesToWinstonStrawnAsPartialPaymentInSettlementAgreement" xlink:to="ATCH_StockIssuedDuringPeriodSharesToWinstonStrawnAsPartialPaymentInSettlementAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodSharesToWinstonStrawnAsPartialPaymentInSettlementAgreement_doc" xml:lang="en-US">Stock issued during period value to winston strawn as partial payment in settlement agreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AdjustmentsToAccumulatedDeficitReversalOfExciseTaxRelatedToPriorShareholderRedemptions" xlink:to="ATCH_AdjustmentsToAccumulatedDeficitReversalOfExciseTaxRelatedToPriorShareholderRedemptions_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_AdjustmentsToAccumulatedDeficitReversalOfExciseTaxRelatedToPriorShareholderRedemptions_doc" xml:lang="en-US">AdjustmentsToAccumulatedDeficitReversalOfExciseTaxRelatedToPriorShareholderRedemptions</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockTransferredDuringPeriodByRelatedPartyValueConversionOfConvertibleSecuritiesPrincipal" xlink:to="ATCH_StockTransferredDuringPeriodByRelatedPartyValueConversionOfConvertibleSecuritiesPrincipal_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartyValueConversionOfConvertibleSecuritiesPrincipal_doc" xml:lang="en-US">The gross value of stock transferred during the period by related party for conversion of principal portion of convertible securities.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ShortTermMergerFinancingMember" xlink:to="ATCH_ShortTermMergerFinancingMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ShortTermMergerFinancingMember_doc" xml:lang="en-US">Short Term Merger Financing [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueSettlementOfDues" xlink:to="ATCH_StockIssuedDuringPeriodValueSettlementOfDues_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodValueSettlementOfDues_doc" xml:lang="en-US">Value of stock issued pursuant to settlement of dues during the period.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesSettlementOfDues" xlink:to="ATCH_StockIssuedDuringPeriodSharesSettlementOfDues_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodSharesSettlementOfDues_doc" xml:lang="en-US">Number of shares of stock issued during the period pursuant to settlement of dues.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueDelayedPaymentsOfDebt" xlink:to="ATCH_StockIssuedDuringPeriodValueDelayedPaymentsOfDebt_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodValueDelayedPaymentsOfDebt_doc" xml:lang="en-US">Value of stock issued as a consideration of delayed payment of debt.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesDelayedPaymentsOfDebt" xlink:to="ATCH_StockIssuedDuringPeriodSharesDelayedPaymentsOfDebt_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodSharesDelayedPaymentsOfDebt_doc" xml:lang="en-US">Number of shares issued as a consideration of delayed payment of debt.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueCompanyObligationsNetOfContributedCapitalForDebtAssumed" xlink:to="ATCH_StockIssuedDuringPeriodValueCompanyObligationsNetOfContributedCapitalForDebtAssumed_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodValueCompanyObligationsNetOfContributedCapitalForDebtAssumed_doc" xml:lang="en-US">Value of stock issued pursuant to cover company obligations net of contributed capital for debt assumed.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodSharesCompanyObligationsNetOfContributedCapitalForDebtAssumed" xlink:to="ATCH_StockIssuedDuringPeriodSharesCompanyObligationsNetOfContributedCapitalForDebtAssumed_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodSharesCompanyObligationsNetOfContributedCapitalForDebtAssumed_doc" xml:lang="en-US">Number of shares issued pursuant to to cover company obligations net of contributed capital for debt assumed.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringPeriodValueReverseStockSplits" xlink:to="ATCH_StockIssuedDuringPeriodValueReverseStockSplits_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringPeriodValueReverseStockSplits_doc" xml:lang="en-US">Stock issued during period value reverse stock splits.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ToppanNoteMember" xlink:to="ATCH_ToppanNoteMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ToppanNoteMember_doc" xml:lang="en-US">Toppan Note [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_HanirePurchaseAgreementMember" xlink:to="ATCH_HanirePurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_HanirePurchaseAgreementMember_doc" xml:lang="en-US">Hanire Purchase Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityWriteOff" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityWriteOff_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityWriteOff_doc" xml:lang="en-US">Fair value measurement with unobservable inputs reconciliation recurring basis liability write off.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PremiumFinncingAgreementMember" xlink:to="ATCH_PremiumFinncingAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PremiumFinncingAgreementMember_doc" xml:lang="en-US">Premium Finncing Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WinstonStrawnLLPMember" xlink:to="ATCH_WinstonStrawnLLPMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WinstonStrawnLLPMember_doc" xml:lang="en-US">Winston Strawn L L P [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WinstonAndStrawnAgreementMember" xlink:to="ATCH_WinstonAndStrawnAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WinstonAndStrawnAgreementMember_doc" xml:lang="en-US">Winston &amp; Strawn Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ValueOfSharesIssuableForServicesInEachInstallment" xlink:to="ATCH_ValueOfSharesIssuableForServicesInEachInstallment_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ValueOfSharesIssuableForServicesInEachInstallment_doc" xml:lang="en-US">Value of shares issuable for services in each installment.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SubscriptionPayableLiabilityNoncurrent" xlink:to="ATCH_SubscriptionPayableLiabilityNoncurrent_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SubscriptionPayableLiabilityNoncurrent_doc" xml:lang="en-US">Subscription payable liability noncurrent.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SeriesAConvertibleDebenturesMember" xlink:to="ATCH_SeriesAConvertibleDebenturesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SeriesAConvertibleDebenturesMember_doc" xml:lang="en-US">Series A Convertible Debentures [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_AugustSecuritiesPurchaseAgreementMember" xlink:to="ATCH_AugustSecuritiesPurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_AugustSecuritiesPurchaseAgreementMember_doc" xml:lang="en-US">August Securities Purchase Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PercentageOfProceedsRaisedInExcessOfThresholdAmount" xlink:to="ATCH_PercentageOfProceedsRaisedInExcessOfThresholdAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PercentageOfProceedsRaisedInExcessOfThresholdAmount_doc" xml:lang="en-US">Percentage of proceeds raised in excess of threshold amount.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ThirdPartyFinancingThresholdAmount" xlink:to="ATCH_ThirdPartyFinancingThresholdAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ThirdPartyFinancingThresholdAmount_doc" xml:lang="en-US">Third party financing threshold amount.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ThresholdPeriodToFileRegistrationStatement" xlink:to="ATCH_ThresholdPeriodToFileRegistrationStatement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ThresholdPeriodToFileRegistrationStatement_doc" xml:lang="en-US">Threshold period to file registration statement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SeptemberSecuritiesPurchaseAgreementMember" xlink:to="ATCH_SeptemberSecuritiesPurchaseAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SeptemberSecuritiesPurchaseAgreementMember_doc" xml:lang="en-US">September Securities Purchase Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertiblePromissoryNotesMember" xlink:to="ATCH_ConvertiblePromissoryNotesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ConvertiblePromissoryNotesMember_doc" xml:lang="en-US">Convertible Promissory Notes [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtInstrumentDiscountPercentage" xlink:to="ATCH_DebtInstrumentDiscountPercentage_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebtInstrumentDiscountPercentage_doc" xml:lang="en-US">Debt instrument discount percentage.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_QualifiedFinancingThresholdGrossProceeds" xlink:to="ATCH_QualifiedFinancingThresholdGrossProceeds_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_QualifiedFinancingThresholdGrossProceeds_doc" xml:lang="en-US">Qualified financing threshold gross proceeds.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtInstrumentAggregateDiscountOnIssuance" xlink:to="ATCH_DebtInstrumentAggregateDiscountOnIssuance_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebtInstrumentAggregateDiscountOnIssuance_doc" xml:lang="en-US">Debt instrument aggregate discount on issuance.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtInstrumentOriginalIssueDiscount" xlink:to="ATCH_DebtInstrumentOriginalIssueDiscount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebtInstrumentOriginalIssueDiscount_doc" xml:lang="en-US">Debt instrument original issue discount.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNotesTransferredToEquitySpa" xlink:to="ATCH_ConvertibleNotesTransferredToEquitySpa_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ConvertibleNotesTransferredToEquitySpa_doc" xml:lang="en-US">Convertible notes transferred to equity spa.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_UnitPricePerShare" xlink:to="ATCH_UnitPricePerShare_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_UnitPricePerShare_doc" xml:lang="en-US">Unit price per share.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TwoThousandTwentyFiveWarrantMember" xlink:to="ATCH_TwoThousandTwentyFiveWarrantMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TwoThousandTwentyFiveWarrantMember_doc" xml:lang="en-US">2025 Warrant [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ClassOfWarrantOrRightNumberOfDaysForExercisePriceDetermination" xlink:to="ATCH_ClassOfWarrantOrRightNumberOfDaysForExercisePriceDetermination_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ClassOfWarrantOrRightNumberOfDaysForExercisePriceDetermination_doc" xml:lang="en-US">Class of warrant or right number of days for exercise price determination.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ClassOfWarrantOrRightExercisePriceDeterminationNumberOfClosingBidPrice" xlink:to="ATCH_ClassOfWarrantOrRightExercisePriceDeterminationNumberOfClosingBidPrice_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ClassOfWarrantOrRightExercisePriceDeterminationNumberOfClosingBidPrice_doc" xml:lang="en-US">Class of warrant or right exercise price determination number of closing bid price.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EquityFinancingParticipationRightTriggerPeriod" xlink:to="ATCH_EquityFinancingParticipationRightTriggerPeriod_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EquityFinancingParticipationRightTriggerPeriod_doc" xml:lang="en-US">Equity financing participation right trigger period.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToExistingInvestors" xlink:to="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToExistingInvestors_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToExistingInvestors_doc" xml:lang="en-US">Placement agent fee rate gross proceeds from units sold to existing investors.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PlacementAgentFeeRateGrossProceedsFromNotesPayable" xlink:to="ATCH_PlacementAgentFeeRateGrossProceedsFromNotesPayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PlacementAgentFeeRateGrossProceedsFromNotesPayable_doc" xml:lang="en-US">Placement agent fee rate gross proceeds from notes payable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToNewInvestors" xlink:to="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToNewInvestors_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PlacementAgentFeeRateGrossProceedsFromUnitsSoldToNewInvestors_doc" xml:lang="en-US">Placement agent fee rate gross proceeds from units sold to new investors.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_WarrantsToPurchaseOfCommonStockTransactionCostTotal" xlink:to="ATCH_WarrantsToPurchaseOfCommonStockTransactionCostTotal_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_WarrantsToPurchaseOfCommonStockTransactionCostTotal_doc" xml:lang="en-US">Warrants to purchase of common stock transaction cost total.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransferredToEquity" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransferredToEquity_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransferredToEquity_doc" xml:lang="en-US">Fair value measurement with unobservable inputs reconciliation recurring basis liability transferred to equity.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdvanceRequests" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdvanceRequests_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdvanceRequests_doc" xml:lang="en-US">FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAdvanceRequests</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EarnoutLiabilityMember" xlink:to="ATCH_EarnoutLiabilityMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EarnoutLiabilityMember_doc" xml:lang="en-US">Earnout Liability [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MergerFinancingDerivativeMember" xlink:to="ATCH_MergerFinancingDerivativeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_MergerFinancingDerivativeMember_doc" xml:lang="en-US">Merger Financing Derivative [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityDerecognizedOnSettlement" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityDerecognizedOnSettlement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityDerecognizedOnSettlement_doc" xml:lang="en-US">FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityDerecognizedOnSettlement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockPurchasedDuringPeriodSharesRealizedGain" xlink:to="ATCH_StockPurchasedDuringPeriodSharesRealizedGain_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockPurchasedDuringPeriodSharesRealizedGain_doc" xml:lang="en-US">Stock purchased during period shares realized gain</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments" xlink:to="ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments_doc" xml:lang="en-US">StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockTransferredDuringPeriodByRelatedPartySharesAsSettlementForCompanyObligationsUnderVariousFinancialInstruments" xlink:to="ATCH_StockTransferredDuringPeriodByRelatedPartySharesAsSettlementForCompanyObligationsUnderVariousFinancialInstruments_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartySharesAsSettlementForCompanyObligationsUnderVariousFinancialInstruments_doc" xml:lang="en-US">StockTransferredDuringPeriodByRelatedPartySharesAsSettlementForCompanyObligationsUnderVariousFinancialInstruments</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ContingentGuaranteeMember" xlink:to="ATCH_ContingentGuaranteeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ContingentGuaranteeMember_doc" xml:lang="en-US">Contingent Guarantee [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SecuredConvertibleDerivativeMember" xlink:to="ATCH_SecuredConvertibleDerivativeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SecuredConvertibleDerivativeMember_doc" xml:lang="en-US">Secured Convertible Derivative [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExchanges" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExchanges_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExchanges_doc" xml:lang="en-US">Fair value measurement with unobservable inputs reconciliation recurring basis liability exchanges.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebentureDerivativeMember" xlink:to="ATCH_DebentureDerivativeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebentureDerivativeMember_doc" xml:lang="en-US">Debenture Derivative [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNoteDerivativeMember" xlink:to="ATCH_ConvertibleNoteDerivativeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ConvertibleNoteDerivativeMember_doc" xml:lang="en-US">Convertible Note Derivative [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringThePeriodValueCommitmentFeeSharesSettledUnderTauAgreement" xlink:to="ATCH_StockIssuedDuringThePeriodValueCommitmentFeeSharesSettledUnderTauAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringThePeriodValueCommitmentFeeSharesSettledUnderTauAgreement_doc" xml:lang="en-US">Stock issued during the period value commitment fee shares settled under tau agreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedDuringThePeriodSharesCommitmentFeeSharesSettledUnderTauAgreement" xlink:to="ATCH_StockIssuedDuringThePeriodSharesCommitmentFeeSharesSettledUnderTauAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedDuringThePeriodSharesCommitmentFeeSharesSettledUnderTauAgreement_doc" xml:lang="en-US">Stock issued during the period shares commitment fee shares settled under tau agreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringOfFairValueOfWarrantsExercised" xlink:to="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringOfFairValueOfWarrantsExercised_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueMeasurementWithUnobservableInputsReconciliationRecurringOfFairValueOfWarrantsExercised_doc" xml:lang="en-US">FairValueMeasurementWithUnobservableInputsReconciliationRecurringOfFairValueOfWarrantsExercised</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet" xlink:to="ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet_doc" xml:lang="en-US">Amount of increase (decrease) in the fair value of convertible notes derivatives gain (loss) recognized in the income statement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ChangeInFairValueOfWinstonStrawnAgreement" xlink:to="ATCH_ChangeInFairValueOfWinstonStrawnAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ChangeInFairValueOfWinstonStrawnAgreement_doc" xml:lang="en-US">Change in fair value of winston strawn agreement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfStockPayables" xlink:to="ATCH_FairValueAdjustmentOfStockPayables_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueAdjustmentOfStockPayables_doc" xml:lang="en-US">Amount of expense (income) related to adjustment to fair value of stock payable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PaidInKindLateFeesToSellers" xlink:to="ATCH_PaidInKindLateFeesToSellers_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PaidInKindLateFeesToSellers_doc" xml:lang="en-US">The amount of late fees paid in shares to sellers.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InterestExpenseFinancialInstruments" xlink:to="ATCH_InterestExpenseFinancialInstruments_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_InterestExpenseFinancialInstruments_doc" xml:lang="en-US">Interest expense financial instruments</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_TransactionCostAttributedToWarrants" xlink:to="ATCH_TransactionCostAttributedToWarrants_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_TransactionCostAttributedToWarrants_doc" xml:lang="en-US">Transaction cost attributed to 2025 warrants.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_OperatingLeaseRightOfUseAssetBeginningBalance" xlink:to="ATCH_OperatingLeaseRightOfUseAssetBeginningBalance_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_OperatingLeaseRightOfUseAssetBeginningBalance_doc" xml:lang="en-US">Operating lease right of use asset beginning balance</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RealizedGainLossOnSaleOfSharesUnderSharePurchaseCommitment" xlink:to="ATCH_RealizedGainLossOnSaleOfSharesUnderSharePurchaseCommitment_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_RealizedGainLossOnSaleOfSharesUnderSharePurchaseCommitment_doc" xml:lang="en-US">Realized gain loss on sale of shares under share purchase commitment.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ExciseTaxPenaltiesAndInterest" xlink:to="ATCH_ExciseTaxPenaltiesAndInterest_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ExciseTaxPenaltiesAndInterest_doc" xml:lang="en-US">Excise tax penalties and interest.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RevenueFromStockLocateFees" xlink:to="ATCH_RevenueFromStockLocateFees_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_RevenueFromStockLocateFees_doc" xml:lang="en-US">Revenue from stock locate fees</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommissionOnTauAgreement" xlink:to="ATCH_CommissionOnTauAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CommissionOnTauAgreement_doc" xml:lang="en-US">Commission on tau agreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockBasedConsultingExpense" xlink:to="ATCH_StockBasedConsultingExpense_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockBasedConsultingExpense_doc" xml:lang="en-US">Stock based consulting expense.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_BankAcquisitionDepositWriteOff" xlink:to="ATCH_BankAcquisitionDepositWriteOff_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_BankAcquisitionDepositWriteOff_doc" xml:lang="en-US">Bank acquisition deposit write off.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DecreaseInOperatingLeaseRightOfUseAsset" xlink:to="ATCH_DecreaseInOperatingLeaseRightOfUseAsset_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DecreaseInOperatingLeaseRightOfUseAsset_doc" xml:lang="en-US">Decrease in operating lease right of use asset</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_NetOperatingLeasePayments" xlink:to="ATCH_NetOperatingLeasePayments_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_NetOperatingLeasePayments_doc" xml:lang="en-US">Amount of net cash outflow (inflow) from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_IncreaseDecreaseInCommissionsAndPayrollTaxesPayable" xlink:to="ATCH_IncreaseDecreaseInCommissionsAndPayrollTaxesPayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_IncreaseDecreaseInCommissionsAndPayrollTaxesPayable_doc" xml:lang="en-US">The change in the commissions and payroll taxes payable recorded on the balance sheet, which is needed to adjust net income to arrive at net cash flows provided by or used in operations.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_IncreaseDecreaseInTradingDeposits" xlink:to="ATCH_IncreaseDecreaseInTradingDeposits_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_IncreaseDecreaseInTradingDeposits_doc" xml:lang="en-US">The increase (decrease) during the reporting period in trading deposits.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RepaymentsOfSecurityConvertibleNotes" xlink:to="ATCH_RepaymentsOfSecurityConvertibleNotes_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_RepaymentsOfSecurityConvertibleNotes_doc" xml:lang="en-US">Transaction cost paid with Security Convertible Notes.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ProceedsFromIssuanceOfDebenture" xlink:to="ATCH_ProceedsFromIssuanceOfDebenture_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ProceedsFromIssuanceOfDebenture_doc" xml:lang="en-US">Proceeds from issuance of debenture.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ProceedsFromNonInterestBearingAdvances" xlink:to="ATCH_ProceedsFromNonInterestBearingAdvances_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ProceedsFromNonInterestBearingAdvances_doc" xml:lang="en-US">Proceeds from non interest bearing advances.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PaymentOnWinstonStrawnSettlementAgreement" xlink:to="ATCH_PaymentOnWinstonStrawnSettlementAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PaymentOnWinstonStrawnSettlementAgreement_doc" xml:lang="en-US">Payment on winston strawn settlement agreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_NoncashOrPartOfNoncashChangesInGoodwillDueToChangeInDeferredTaxLiability" xlink:to="ATCH_NoncashOrPartOfNoncashChangesInGoodwillDueToChangeInDeferredTaxLiability_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_NoncashOrPartOfNoncashChangesInGoodwillDueToChangeInDeferredTaxLiability_doc" xml:lang="en-US">It represents the information about noncash or part of noncash changes in goodwill due to change in deferred tax liability.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialSharesIssuedValuePurchaseCommitmentAmount" xlink:to="ATCH_InitialSharesIssuedValuePurchaseCommitmentAmount_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_InitialSharesIssuedValuePurchaseCommitmentAmount_doc" xml:lang="en-US">The purchase commitment amount issued in the form of shares at initial stage.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ValueOfSharesTransferredByRelatedPartiesToSettleObligations" xlink:to="ATCH_ValueOfSharesTransferredByRelatedPartiesToSettleObligations_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ValueOfSharesTransferredByRelatedPartiesToSettleObligations_doc" xml:lang="en-US">Amount of Value of shares transferred by related parties to settle obligations.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockIssuedSettlementOfAccountsPayableToRelatedParty" xlink:to="ATCH_StockIssuedSettlementOfAccountsPayableToRelatedParty_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_StockIssuedSettlementOfAccountsPayableToRelatedParty_doc" xml:lang="en-US">The fair value of stock issued to related party for settlement of accounts payable.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ReceivableFromSharesAdvancedUnderSharePurchaseCommitment" xlink:to="ATCH_ReceivableFromSharesAdvancedUnderSharePurchaseCommitment_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ReceivableFromSharesAdvancedUnderSharePurchaseCommitment_doc" xml:lang="en-US">Receivable from shares advanced under share purchase commitment.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesIssuedForCommercialBancorpAcquisitionExtension" xlink:to="ATCH_SharesIssuedForCommercialBancorpAcquisitionExtension_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SharesIssuedForCommercialBancorpAcquisitionExtension_doc" xml:lang="en-US">Shares issued for commercial bancorp acquisition extension</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesIssuedForConversionOfPrincipalAndInterestOnLongtermNote" xlink:to="ATCH_SharesIssuedForConversionOfPrincipalAndInterestOnLongtermNote_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SharesIssuedForConversionOfPrincipalAndInterestOnLongtermNote_doc" xml:lang="en-US">Shares issued for conversion of principal and interest on longterm note</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesIssuedForStockPayable" xlink:to="ATCH_SharesIssuedForStockPayable_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SharesIssuedForStockPayable_doc" xml:lang="en-US">Shares issued for stock payable</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_InitialValueOfDerivativeIncludedInMergerFinancing" xlink:to="ATCH_InitialValueOfDerivativeIncludedInMergerFinancing_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_InitialValueOfDerivativeIncludedInMergerFinancing_doc" xml:lang="en-US">InitialValueOfDerivativeIncludedInMergerFinancing</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PromissoryNoteIssuedUnderInsurancePremium" xlink:to="ATCH_PromissoryNoteIssuedUnderInsurancePremium_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PromissoryNoteIssuedUnderInsurancePremium_doc" xml:lang="en-US">PromissoryNoteIssuedUnderInsurancePremium</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ReversalOfExciseTax" xlink:to="ATCH_ReversalOfExciseTax_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ReversalOfExciseTax_doc" xml:lang="en-US">Reversal of excise tax.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesIssuedForWinstonStrawnSettlementAgreement" xlink:to="ATCH_SharesIssuedForWinstonStrawnSettlementAgreement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SharesIssuedForWinstonStrawnSettlementAgreement_doc" xml:lang="en-US">Shares issued for winston strawn settlement agreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SharesIssuedForNoncashExerciseOf2025Warrants" xlink:to="ATCH_SharesIssuedForNoncashExerciseOf2025Warrants_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SharesIssuedForNoncashExerciseOf2025Warrants_doc" xml:lang="en-US">Shares issued for noncash exercise of 2025 warrants</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities" xlink:to="ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities_doc" xml:lang="en-US">RightofuseAssetsObtainedInExchangeForNewOperatingLeaseLiabilities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DebtConversionConvertedInstrumentValueTransferred" xlink:to="ATCH_DebtConversionConvertedInstrumentValueTransferred_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DebtConversionConvertedInstrumentValueTransferred_doc" xml:lang="en-US">Debt conversion converted instrument value transferred.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_NumberOfSharesPerUnitIssued" xlink:to="ATCH_NumberOfSharesPerUnitIssued_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_NumberOfSharesPerUnitIssued_doc" xml:lang="en-US">Number of common stock to be issued per each unit issued during the period.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_NumberOfWarrantsPerUnitIssued" xlink:to="ATCH_NumberOfWarrantsPerUnitIssued_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_NumberOfWarrantsPerUnitIssued_doc" xml:lang="en-US">Number of warrants to be issued per each unit issued during the period.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PostReverseSplitMember" xlink:to="ATCH_PostReverseSplitMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PostReverseSplitMember_doc" xml:lang="en-US">Post Reverse Split [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_UnitsIssuedProceeds" xlink:to="ATCH_UnitsIssuedProceeds_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_UnitsIssuedProceeds_doc" xml:lang="en-US">Total cash inflow from issuance of units during the period.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_GrossProceedsFromIssuanceOfDebtAndUnits" xlink:to="ATCH_GrossProceedsFromIssuanceOfDebtAndUnits_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_GrossProceedsFromIssuanceOfDebtAndUnits_doc" xml:lang="en-US">Aggregate cash inflow from issuance of debt and units during the period.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ImpairmentCharges" xlink:to="ATCH_ImpairmentCharges_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ImpairmentCharges_doc" xml:lang="en-US">Impairment charges.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EquityFinancingMaximumReinvestmentPercentage" xlink:to="ATCH_EquityFinancingMaximumReinvestmentPercentage_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EquityFinancingMaximumReinvestmentPercentage_doc" xml:lang="en-US">Equity financing maximum reinvestment percentage.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_EquityFinancingMinimumThresholdInvestmentForFutureOffering" xlink:to="ATCH_EquityFinancingMinimumThresholdInvestmentForFutureOffering_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_EquityFinancingMinimumThresholdInvestmentForFutureOffering_doc" xml:lang="en-US">Equity financing minimum threshold investment for future offering.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfFinancialInstrumentsNetOfTax" xlink:to="ATCH_FairValueAdjustmentOfFinancialInstrumentsNetOfTax_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FairValueAdjustmentOfFinancialInstrumentsNetOfTax_doc" xml:lang="en-US">The amount of increase (decrease) in fair value of financial instruments, net of tax.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SellersNotesMember" xlink:to="ATCH_SellersNotesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SellersNotesMember_doc" xml:lang="en-US">Sellers Notes [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashDepositNumberOfFinancialInstitutions" xlink:to="ATCH_CashDepositNumberOfFinancialInstitutions_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CashDepositNumberOfFinancialInstitutions_doc" xml:lang="en-US">Number of financial institutions into which company has deposited cash at end of the year.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsDisclosuresTextBlock" xlink:to="ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsDisclosuresTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsDisclosuresTextBlock_doc" xml:lang="en-US">The entire disclosure on cash and securities segregated under federal and other regulation.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashReserveDepositRequired" xlink:to="ATCH_CashReserveDepositRequired_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CashReserveDepositRequired_doc" xml:lang="en-US">Cash reserve required in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsAxis" xlink:to="ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsAxis_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulationsAxis_doc" xml:lang="en-US">Cash and Securities Segregated under Federal and Other Regulations [Axis]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CustomersTransactionsAndCreditBalancesMember" xlink:to="ATCH_CustomersTransactionsAndCreditBalancesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CustomersTransactionsAndCreditBalancesMember_doc" xml:lang="en-US">Customers Transactions and Credit Balances [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CashReserveDepositLessThanAmountRequired" xlink:to="ATCH_CashReserveDepositLessThanAmountRequired_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CashReserveDepositLessThanAmountRequired_doc" xml:lang="en-US">Represents the cash on deposit in the reserve account less than the amount required in accordance with federal regulations.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_BrokerDealerTransactionsAndCreditBalancesMember" xlink:to="ATCH_BrokerDealerTransactionsAndCreditBalancesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_BrokerDealerTransactionsAndCreditBalancesMember_doc" xml:lang="en-US">Broker Dealer Transactions and Credit Balances [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_BrokerDealerNetCapitalRequirementSecRegulationTextBlock" xlink:to="ATCH_BrokerDealerNetCapitalRequirementSecRegulationTextBlock_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_BrokerDealerNetCapitalRequirementSecRegulationTextBlock_doc" xml:lang="en-US">The entire disclosure on broker-dealer, net capital requirement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_DerivativeLiabilityWarrants" xlink:to="ATCH_DerivativeLiabilityWarrants_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_DerivativeLiabilityWarrants_doc" xml:lang="en-US">Derivative liability warrants</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SecuredConvertibleNotesMember" xlink:to="ATCH_SecuredConvertibleNotesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SecuredConvertibleNotesMember_doc" xml:lang="en-US">Secured Convertible Notes [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PercentageOfBonusPayableFourthQuarter" xlink:to="ATCH_PercentageOfBonusPayableFourthQuarter_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PercentageOfBonusPayableFourthQuarter_doc" xml:lang="en-US">Percentage of bonus payable fourth quarter.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SettlementAgreementMember" xlink:to="ATCH_SettlementAgreementMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SettlementAgreementMember_doc" xml:lang="en-US">Settlement Agreement [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PacsquareMember" xlink:to="ATCH_PacsquareMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PacsquareMember_doc" xml:lang="en-US">Pacsquare [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_SeriesConvertibleDebenturesMember" xlink:to="ATCH_SeriesConvertibleDebenturesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_SeriesConvertibleDebenturesMember_doc" xml:lang="en-US">Series Convertible Debentures [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNotesChardanMember" xlink:to="ATCH_ConvertibleNotesChardanMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ConvertibleNotesChardanMember_doc" xml:lang="en-US">Convertible Notes Chardan [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_PromissoryNoteMember" xlink:to="ATCH_PromissoryNoteMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_PromissoryNoteMember_doc" xml:lang="en-US">Promissory Note [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MeasurementInputRecoveryRateMember" xlink:to="ATCH_MeasurementInputRecoveryRateMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_MeasurementInputRecoveryRateMember_doc" xml:lang="en-US">Measurement Input Recovery Rate [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MeasurementInputAnticipatedMonthlyAdvancePaymentsMember" xlink:to="ATCH_MeasurementInputAnticipatedMonthlyAdvancePaymentsMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_MeasurementInputAnticipatedMonthlyAdvancePaymentsMember_doc" xml:lang="en-US">Measurement Input Anticipated Monthly Advance Payments [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_MeasurementInputInterestBalanceMember" xlink:to="ATCH_MeasurementInputInterestBalanceMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_MeasurementInputInterestBalanceMember_doc" xml:lang="en-US">Measurement Input Interest Balance [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleDerivativeMember" xlink:to="ATCH_ConvertibleDerivativeMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ConvertibleDerivativeMember_doc" xml:lang="en-US">Convertible Derivative [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ConvertibleNotesMember" xlink:to="ATCH_ConvertibleNotesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ConvertibleNotesMember_doc" xml:lang="en-US">Convertible Notes [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FiniteLivedPacsquareAssetPurchase" xlink:to="ATCH_FiniteLivedPacsquareAssetPurchase_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_FiniteLivedPacsquareAssetPurchase_doc" xml:lang="en-US">Finitelived pacsquare asset purchase.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ChardanCapitalMarketsLLCMember" xlink:to="ATCH_ChardanCapitalMarketsLLCMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_ChardanCapitalMarketsLLCMember_doc" xml:lang="en-US">Chardan Capital Markets LLC [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_CommonStockPercentage" xlink:to="ATCH_CommonStockPercentage_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_CommonStockPercentage_doc" xml:lang="en-US">Common stock percentage.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_UnissuedStockBasedCompensationSharesMember" xlink:to="ATCH_UnissuedStockBasedCompensationSharesMember_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_UnissuedStockBasedCompensationSharesMember_doc" xml:lang="en-US">Unissued Stock Based Compensation Shares [Member]</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_LossOnSettlement" xlink:to="ATCH_LossOnSettlement_doc" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="ATCH_LossOnSettlement_doc" xml:lang="en-US">Loss on settlement.</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsCurrent" xlink:to="us-gaap_AssetsCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsCurrent_2_lbl" xml:lang="en-US">Assets, Current</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Assets_3_lbl" xml:lang="en-US">Assets</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrent_2_lbl" xml:lang="en-US">Liabilities, Current</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Liabilities_2_lbl" xml:lang="en-US">Liabilities</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable" xlink:to="us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable_2_lbl" xml:lang="en-US">Common Stock, Share Subscribed but Unissued, Subscriptions Receivable</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_4_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquity_4_lbl" xml:lang="en-US">Equity, Attributable to Parent</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_2_lbl" xml:lang="en-US">Liabilities and Equity</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Revenues" xlink:to="us-gaap_Revenues_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Revenues_2_lbl" xml:lang="en-US">Revenues</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherOperatingIncomeExpenseNet" xlink:to="us-gaap_OtherOperatingIncomeExpenseNet_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherOperatingIncomeExpenseNet_2_lbl" xml:lang="en-US">Other Operating Income (Expense), Net</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpenses_2_lbl" xml:lang="en-US">Operating Expenses</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfWinstonStrawnAgreement" xlink:to="ATCH_FairValueAdjustmentOfWinstonStrawnAgreement_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueAdjustmentOfWinstonStrawnAgreement_3_lbl" xml:lang="en-US">FairValueAdjustmentOfWinstonStrawnAgreement</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueAdjustmentOfStockPayable" xlink:to="ATCH_FairValueAdjustmentOfStockPayable_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueAdjustmentOfStockPayable_3_lbl" xml:lang="en-US">FairValueAdjustmentOfStockPayable</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpenseNonoperating" xlink:to="us-gaap_InterestExpenseNonoperating_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestExpenseNonoperating_2_lbl" xml:lang="en-US">Interest Expense, Nonoperating</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NonoperatingIncomeExpense" xlink:to="us-gaap_NonoperatingIncomeExpense_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NonoperatingIncomeExpense_2_lbl" xml:lang="en-US">Nonoperating Income (Expense)</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2_lbl" xml:lang="en-US">Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxExpenseBenefit" xlink:to="us-gaap_IncomeTaxExpenseBenefit_2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxExpenseBenefit_2_lbl" xml:lang="en-US">Income Tax Expense (Benefit)</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments" xlink:to="ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments_3_lbl" xml:lang="en-US">StockTransferredDuringPeriodByRelatedPartyValueAsSettlementForCompanyObligationsUnderVariousFinancialInstruments</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet" xlink:to="ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet_3_lbl" xml:lang="en-US">FairValueOfDerivativeGainLossOnConvertibleNoteDerivativeNet</link:label>
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ATCH_ChangeInFairValueOfWinstonStrawnAgreement" xlink:to="ATCH_ChangeInFairValueOfWinstonStrawnAgreement_3_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ATCH_ChangeInFairValueOfWinstonStrawnAgreement_3_lbl" xml:lang="en-US">ChangeInFairValueOfWinstonStrawnAgreement</link:label>
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