Right-of-use assets and lease liabilities (Tables)

6 Months Ended

Jun. 30, 2026

Right-of-use assets and lease liabilities

Schedule of operating lease expenses


		For the six months ended June 30,
		2025		2026		2026
		RMB		RMB		US$
Amortization of right of use assets and interest of lease liabilities		548,350		298,274		43,960
Operating lease expenses with an initial term of 12 months or less		—		51,574		7,601
Total operating lease expenses		548,350		349,848		51,561


		As of December 31,		As of June 30,		As of June 30,
		2025		2026		2026
		RMB		RMB		US$
Operating cash flows used in operating lease		916,061		252,223		37,173
Right-of-use assets obtained in exchange for new operating lease liabilities		—		663,702		97,818
Right-of-use assets obtained in exchange for operating lease liabilities from modification		1,198,602		—		—
Weighted-average remaining lease term-operating		2.0 years		3.0 years		3.0 years
Weighted-average discount rate-operating		3.2	%	3.2	%	3.2	%

Schedule of maturity analysis of the annual undiscounted cash flows for the lease liabilities

The following is a maturity analysis of the annual undiscounted cash flows for the lease liabilities as of June 30, 2026:


		Operating lease
		RMB		US$
Years ending December 31,
2027		590,405		87,015
2028		411,663		60,672
2029		185,096		27,280
2030		194,347		28,643
2031		99,547		14,671
Total undiscounted lease payments		1,481,058		218,281
Less: Imputed interest		(75,758)		(11,166)
Lease liabilities recognized in the unaudited condensed consolidated balance sheet		1,405,300		207,115