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	29,101	-1,694	-5.50	2026-11-02	BT
BITB	Bitwise Bitcoin ETF	36,866	-343	-0.92	2026-10-29	BT
BTC	Grayscale Bitcoin Mini Trust ETF	62,938	-190	-0.30	2026-10-30	BT
BTCC	Purpose Bitcoin ETF	18,069	-5	-0.03	2026-10-30	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	176,324	+130	+0.07	2026-10-29	BT
GBTC	Grayscale Bitcoin Trust ETF	125,241	-5	-0.00	2026-10-30	BT
IBIT	iShares Bitcoin Trust ETF	811,817	-3,056	-0.38	2026-10-30	BT