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	47,410	-60	-0.13	2025-04-08	BT
BITB	Bitwise Bitcoin ETF	37,920	0	0.00	2025-04-07	BT
BTC	Grayscale Bitcoin Mini Trust ETF	40,988	0	0.00	2025-04-07	BT
BTCC	Purpose Bitcoin ETF	22,007	+2	+0.01	2025-04-07	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	196,978	0	0.00	2025-04-04	BT
GBTC	Grayscale Bitcoin Trust ETF	192,233	-323	-0.17	2025-04-07	BT
HODL	VanEck Bitcoin ETF	14,211	0	0.00	2025-04-07	BT
IBIT	iShares Bitcoin Trust ETF	575,369	-122	-0.02	2025-04-04	BT