Several U.S. altcoin ETFs for Solana, Litecoin, and Hedera launched on October 28-29, 2025, spearheaded by Bitwise, Canary Finance, and Grayscale. These ETFs aim to boost market liquidity and attract institutional interest in altcoins. Notably, the Rex-Osprey XRP ETF achieved $100 million in assets under management within six weeks. The launch was facilitated by the SEC's auto-effective rule, which expedited the approval process, indicating a growing regulatory acceptance and potential shift in market dynamics. This development marks a significant step in the integration of altcoins into mainstream financial markets.