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	33,699	+143	+0.43	2026-08-05	BT
BITB	Bitwise Bitcoin ETF	36,889	+135	+0.37	2026-08-03	BT
BTC	Grayscale Bitcoin Mini Trust ETF	58,928	0	0.00	2026-08-04	BT
BTCC	Purpose Bitcoin ETF	18,527	0	0.00	2026-08-04	BT
FBTC	Fidelity Wise Origin Bitcoin Fund	171,720	+304	+0.18	2026-08-04	BT
GBTC	Grayscale Bitcoin Trust ETF	132,575	-5	-0.00	2026-08-04	BT
IBIT	iShares Bitcoin Trust ETF	741,512	+2,650	+0.36	2026-08-04	BT