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	32,254	-325	-1.00	2026-06-05	BT
BITB	Bitwise Bitcoin ETF	36,690	0	0.00	2026-06-04	BT
BTC	Grayscale Bitcoin Mini Trust ETF	52,857	0	0.00	2026-06-05	BT
BTCC	Purpose Bitcoin ETF	18,744	+6	+0.03	2026-06-05	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	179,996	-87	-0.05	2026-06-04	BT
GBTC	Grayscale Bitcoin Trust ETF	145,022	-5	-0.00	2026-06-05	BT
IBIT	iShares Bitcoin Trust ETF	774,434	+537	+0.07	2026-06-04	BT