The daily volume (in USD) for spot bitcoin ETFs that track the current BTC price, namely BlackRock (IBIT), the Grayscale Bitcoin Trust (GBTC), Grayscale Bitcoin Mini Trust ETF (BTC), Fidelity (FBTC), Ark Invest/21Shares (ARKB), Bitwise (BITB), Franklin (EZBC), Invesco/Galaxy (BTCO), VanEck (HODL), Valkyrie (BRRR), WisdomTree (BTCW) and Hashdex (DEFI).