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	51,055	+2,368	+4.86	2025-07-11	BT
BITB	Bitwise Bitcoin ETF	40,790	+54	+0.13	2025-07-10	BT
BTC	Grayscale Bitcoin Mini Trust ETF	45,192	+721	+1.62	2025-07-11	BT
BTCC	Purpose Bitcoin ETF	0	-21,172	-100.00	2025-07-11	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	207,063	+2,857	+1.40	2025-07-10	BT
GBTC	Grayscale Bitcoin Trust ETF	183,748	-361	-0.20	2025-07-11	BT
HODL	VanEck Bitcoin ETF	15,887	+134	+0.85	2025-07-11	BT
IBIT	iShares Bitcoin Trust ETF	706,008	+3,952	+0.56	2025-07-10	BT