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	34,487	-91	-0.26	2026-10-02	BT
BITB	Bitwise Bitcoin ETF	37,838	0	0.00	2026-10-01	BT
BTC	Grayscale Bitcoin Mini Trust ETF	63,259	+172	+0.27	2026-10-02	BT
BTCC	Purpose Bitcoin ETF	18,393	+172	+0.94	2026-10-02	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	182,412	-754	-0.41	2026-10-01	BT
GBTC	Grayscale Bitcoin Trust ETF	126,606	-376	-0.30	2026-10-02	BT
IBIT	iShares Bitcoin Trust ETF	803,343	+2,309	+0.29	2026-10-01	BT