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	34,817	-444	-1.26	2026-03-27	BT
BITB	Bitwise Bitcoin ETF	37,573	-282	-0.74	2026-03-26	BT
BTC	Grayscale Bitcoin Mini Trust ETF	51,673	-79	-0.15	2026-03-27	BT
BTCC	Purpose Bitcoin ETF	19,290	+29	+0.15	2026-03-27	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	187,469	-478	-0.25	2026-03-26	BT
GBTC	Grayscale Bitcoin Trust ETF	154,729	-372	-0.24	2026-03-27	BT
IBIT	iShares Bitcoin Trust ETF	782,180	-3,060	-0.39	2026-03-27	BT