Accounts receivable, net (Tables)
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6 Months Ended |
Jun. 30, 2026 |
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| Accounts receivable, net |
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| Summary of accounts receivable, net |
| | | | | | | | | As of | | As of | | As of | | | December 31, | | June 30, | | June 30, | | | 2025 | | 2026 | | 2026 | | | RMB | | RMB | | US$ | Accounts receivable – third parties | | 7,146,902 | | 8,337,549 | | 1,228,803 | Less: allowance for credit losses | | (887,898) | | (2,318,007) | | (341,632) | Accounts receivable, net | | 6,259,004 | | 6,019,542 | | 887,171 |
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| Summary of allowance for credit losses |
| | | | | | | | | As o | | As of | | As of | | | December 31, | | June 30, | | June 30, | | | 2025 | | 2026 | | 2026 | | | RMB | | RMB | | US$ | Allowance for credit losses at beginning of the period | | 102,200 | | 887,898 | | 130,860 | Additions charged to expense | | 785,698 | | 1,430,109 | | 210,772 | Allowance for credit losses at end of the period | | 887,898 | | 2,318,007 | | 341,632 |
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| Summary of aging of accounts receivable based on the services provided |
| | | | | | | | | As of | | As of | | As of | | | December 31, | | June 30, | | June 30, | | | 2025 | | 2026 | | 2026 | | | RMB | | RMB | | US$ | Within 90 days | | 4,016,277 | | 2,589,833 | | 381,694 | 90 – 180 days | | 1,209,825 | | 2,688,785 | | 396,279 | 180 days – 1 year | | 1,920,800 | | 1,745,225 | | 257,214 | Over 1 year | | — | | 1,313,706 | | 193,616 | Accounts receivable | | 7,146,902 | | 8,337,549 | | 1,228,803 |
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