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	30,753	-1,114	-3.50	2026-09-17	BT
BITB	Bitwise Bitcoin ETF	38,029	0	0.00	2026-09-16	BT
BTC	Grayscale Bitcoin Mini Trust ETF	62,874	0	0.00	2026-09-17	BT
BTCC	Purpose Bitcoin ETF	18,280	-26	-0.14	2026-09-17	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	173,011	-695	-0.40	2026-09-16	BT
GBTC	Grayscale Bitcoin Trust ETF	127,295	-244	-0.19	2026-09-17	BT
IBIT	iShares Bitcoin Trust ETF	782,623	-1,902	-0.24	2026-09-16	BT