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	35,909	-853	-2.32	2026-01-30	BT
BITB	Bitwise Bitcoin ETF	37,651	0	0.00	2026-01-29	BT
BTC	Grayscale Bitcoin Mini Trust ETF	48,137	-442	-0.91	2026-01-30	BT
BTCC	Purpose Bitcoin ETF	19,645	-20	-0.10	2026-01-30	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	192,014	-2,003	-1.03	2026-01-29	BT
GBTC	Grayscale Bitcoin Trust ETF	159,565	-1,426	-0.89	2026-01-30	BT
IBIT	iShares Bitcoin Trust ETF	773,671	-3,788	-0.49	2026-01-29	BT