The cumulative trading volume for U.S. spot crypto ETFs has surpassed $2 trillion as of January 2, doubling from $1 trillion in just eight months. On the same day, Bitcoin and Ethereum ETFs saw a net inflow of $646 million, with BlackRock's IBIT holding a dominant 70% market share. The range of assets covered by spot ETFs has expanded to include SOL and XRP, with XRP-related products attracting $1.2 billion in capital since their launch in November.