FAIR VALUE MEASUREMENT (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Schedule of fair value measurements of the Group's assets that were measured at fair value on a recurring basis

As of December 31, 2023 and 2024, information about inputs for the fair value measurements of the Group’s assets that were measured at fair value on a recurring basis in periods subsequent to their initial recognition is as follows:

	As of December 31, 2024
	Quoted prices in active markets for identical instruments (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (level 3)		Total balance
	US$		US$		US$		US$
Financial instruments held, at fair value
Funds		2,691,097		11,770,376		3,692,505		18,153,978
Bonds		54,418,366		—		—		54,418,366
Stock		2,270,679		—		—		2,270,679
Others		704,059		—		—		704,059
Cash and cash equivalents
Funds		4,023,182		—		—		4,023,182
Long‑term available-for-sale securities		—		—		4,410,382		4,410,382
Total		64,107,383		11,770,376		8,102,887		83,980,646

	As of December 31, 2023
	Quoted prices in active markets for identical instruments (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (level 3)		Total balance
	US$		US$		US$		US$
Financial instruments held, at fair value
Funds		2,634,959		353,525		3,435,440		6,423,924
Bonds		418,077,123		—		—		418,077,123
Stock		3,014,507		—		—		3,014,507
Others		644,000		—		—		644,000
Cash and cash equivalents
Funds		6,428,256		—		—		6,428,256
Long‑term available-for-sale securities		—		—		4,066,490		4,066,490
Total		430,798,845		353,525		7,501,930		438,654,300

Schedule of movements of Level 3 fair value measurements

The movements of Level 3 fair value measurements for the years ended December 31, 2023 and 2024 are as follows:

	US$
As of January 1, 2023		7,378,683
Additions during the year		1,000,000
Net unrealized loss		(876,753	)
As of December 31, 2023		7,501,930
Additions during the year		—
Net unrealized gain		600,957
As of December 31, 2024		8,102,887