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	43,719	+711	+1.65	2025-08-29	BT
BITB	Bitwise Bitcoin ETF	40,646	-7	-0.02	2025-08-28	BT
BTC	Grayscale Bitcoin Mini Trust ETF	46,520	+48	+0.10	2025-08-29	BT
BTCC	Purpose Bitcoin ETF	20,716	+27	+0.13	2025-08-29	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	200,108	+43	+0.02	2025-08-28	BT
GBTC	Grayscale Bitcoin Trust ETF	178,728	-7	-0.00	2025-08-29	BT
IBIT	iShares Bitcoin Trust ETF	746,583	+567	+0.08	2025-08-28	BT