Documentation

ticker - the ticker (symbol) of the ETF
dt - the as of date as specified on the issuer's website (ISO 8601 format)
holdings - the issuer's BTC holdings
change - the change in holdings compared to the prior day
notes - notes on any calculation performed to arrive at holdings
update_ts - update timestamp in UTC (ISO 8601 format)
error - whether there was an error loading current data. If true, data is returned from the last successful day.

Data for Supported ETFs

Ticker	Description	Holdings	Change	Change %	As of Date	BT
ARKB	ARK 21Shares Bitcoin ETF	39,146	+478	+1.24	2025-12-08	BT
BITB	Bitwise Bitcoin ETF	40,147	+54	+0.13	2025-12-04	BT
BTC	Grayscale Bitcoin Mini Trust ETF	48,626	0	0.00	2025-12-05	BT
BTCC	Purpose Bitcoin ETF	20,010	+10	+0.05	2025-12-05	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	201,531	+305	+0.15	2025-12-05	BT
GBTC	Grayscale Bitcoin Trust ETF	167,348	-116	-0.07	2025-12-05	BT
IBIT	iShares Bitcoin Trust ETF	775,715	-363	-0.05	2025-12-05	BT