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	39,010	+66	+0.17	2025-11-28	BT
BITB	Bitwise Bitcoin ETF	40,043	-7	-0.02	2025-11-27	BT
BTC	Grayscale Bitcoin Mini Trust ETF	48,534	0	0.00	2025-11-28	BT
BTCC	Purpose Bitcoin ETF	19,774	0	0.00	2025-11-28	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	199,983	-370	-0.18	2025-11-26	BT
GBTC	Grayscale Bitcoin Trust ETF	167,600	+48	+0.03	2025-11-28	BT
IBIT	iShares Bitcoin Trust ETF	777,722	+476	+0.06	2025-11-26	BT