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	32,098	-673	-2.05	2026-06-18	BT
BITB	Bitwise Bitcoin ETF	36,788	0	0.00	2026-06-16	BT
BTC	Grayscale Bitcoin Mini Trust ETF	53,522	+66	+0.12	2026-06-17	BT
BTCC	Purpose Bitcoin ETF	18,625	-98	-0.52	2026-06-17	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	180,018	+217	+0.12	2026-06-17	BT
GBTC	Grayscale Bitcoin Trust ETF	140,403	-261	-0.19	2026-06-17	BT
IBIT	iShares Bitcoin Trust ETF	765,936	-475	-0.06	2026-06-17	BT