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Other current assets (Details)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Other current assets          
Prepayment ¥ 28,947,278 $ 3,965,761 ¥ 21,956,225    
Inventory 10,674,018 1,462,334 10,383,964    
Receivables from third party payment service providers 12,693,037 1,738,939 7,833,192    
Receivables from Funding Partners and other service providers 24,435,473 3,347,646 25,848,011    
Receivable from broker for derivative collateral 267,280,381 36,617,262 411,567,717    
Deposits prepaid to securities companies 1,231,094,816 168,659,298 50,143,583    
Others 430,728,834 59,009,609 259,404,811    
Total 2,005,853,837 274,800,849 787,137,503    
Less: Allowance for other current assets (72,671,045) (9,955,892) (116,860,992) $ (16,009,890) ¥ (256,349,242)
Other current assets ¥ 1,933,182,792 $ 264,844,957 ¥ 670,276,511