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Interest and investment income, net (Tables)

12 Months Ended

Dec. 31, 2024

Interest and investment income, net

Schedule of interest and investment income, net

​

​	​	​	​	​	​	​	​	​
​	​	For the years ended December 31,
​	​	2022	​	2023	​	2024
​		RMB		RMB		RMB		US$
Unrealized investment income/(loss) of short-term investments		(40,405,563)		(202,012,339)		125,179,719		17,149,551
Realized investment income of short-term investments		154,931,404		300,705,577		191,828,265		26,280,365
Unrealized investment (loss)/income of long-term investments		(58,356,978)		645,974,321		(131,604,073)		(18,029,685)
Realized investment loss of long-term investments	​	(8,550,287)	​	(659,477,110)	​	—	​	—
Investment income of structured deposits		3,815,277		59,394,774		49,039,769		6,718,421
Interest income, net		54,793,874		110,747,398		145,618,456		19,949,647
Income from the repurchase of convertible senior notes	​	10,028,456	​	—	​	—	​	—
Interest expense of convertible senior notes		(3,439,972)		—		—		—
​		112,816,211		255,332,621		380,062,136		52,068,299

Schedule of gain/(loss) on derivative instruments

​

​	​	​	​	​	​	​	​	​
​	​	For the years ended December 31,
​		2022		2023		2024
​	​	RMB	​	RMB	​	RMB		US$
Unrealized investment income/(loss) of derivative instruments	​	(180,503,919)	​	(149,741,836)	​	222,975,608	​	30,547,533
Realized investment income/(loss) of derivative instruments	​	110,083,438	​	303,576,774	​	(203,518,248)	​	(27,881,886)
​	​	(70,420,481)	​	153,834,938	​	19,457,360	​	2,665,647

​

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Tabular disclosure of investment income, including, but not limited to, interest and dividend income and amortization of discount (premium) derived from debt and equity securities. Excludes realized and unrealized gain (loss) on investments.

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Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.

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