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	35,220	-362	-1.02	2026-02-06	BT
BITB	Bitwise Bitcoin ETF	38,323	-244	-0.63	2026-02-04	BT
BTC	Grayscale Bitcoin Mini Trust ETF	48,556	0	0.00	2026-02-05	BT
BTCC	Purpose Bitcoin ETF	19,490	-69	-0.35	2026-02-05	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	189,163	-1,720	-0.90	2026-02-05	BT
GBTC	Grayscale Bitcoin Trust ETF	158,215	-576	-0.36	2026-02-05	BT
IBIT	iShares Bitcoin Trust ETF	761,915	-2,977	-0.39	2026-02-05	BT