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	35,678	+33	+0.09	2026-03-18	BT
BITB	Bitwise Bitcoin ETF	38,920	0	0.00	2026-03-16	BT
BTC	Grayscale Bitcoin Mini Trust ETF	51,689	0	0.00	2026-03-17	BT
BTCC	Purpose Bitcoin ETF	19,362	-25	-0.13	2026-03-17	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	188,797	+326	+0.17	2026-03-17	BT
GBTC	Grayscale Bitcoin Trust ETF	155,867	-6	-0.00	2026-03-17	BT
IBIT	iShares Bitcoin Trust ETF	786,329	+2,267	+0.29	2026-03-17	BT