Fair value of assets and liabilities - Xiaoying card loan products and Significant unobservable inputs (Details)	12 Months Ended
Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2022 USD ($)
Fair value of assets and liabilities
Financial guarantee derivative		¥ 11,816,799
Financial guarantee derivative	¥ 107,890,394	565,953,269	$ 15,642,637
Financial guarantee derivative
Fair value of assets and liabilities
Financial guarantee derivative	11,816,799		0
Financial guarantee derivative	107,890,394	565,953,269	15,642,637
Potential maximum undiscounted amount payable (Remaining estimated payment to financial institutional cooperators based on the pre-agreed Cap at December 31, 2020)	94,183,515	1,285,566,707	13,655,326
Loan products
Fair value of assets and liabilities
Financial guarantee derivative	2,167,354,119	25,229,094,745	314,236,809
Loans at fair value	¥ 1,405,147,876	¥ 9,877,178,724	$ 203,727,292
Remaining weighted average contractual term (Month)	1 month 28 days	6 months 23 days
Estimated net default rate (in percentage)	7.23%	7.74%	7.23%

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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-Publisher FASB
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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The estimated net default rate of outstanding loan balances.

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The remaining weighted average contractual term of outstanding loan balances.

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