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	33,802	+21	+0.06	2026-07-31	BT
BITB	Bitwise Bitcoin ETF	36,710	-288	-0.78	2026-07-30	BT
BTC	Grayscale Bitcoin Mini Trust ETF	58,929	+35	+0.06	2026-07-31	BT
BTCC	Purpose Bitcoin ETF	18,527	-3	-0.02	2026-07-31	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	171,800	+239	+0.14	2026-07-30	BT
GBTC	Grayscale Bitcoin Trust ETF	133,433	-5	-0.00	2026-07-31	BT
IBIT	iShares Bitcoin Trust ETF	737,118	-1,948	-0.26	2026-07-31	BT