The U.S. market has seen a significant increase in altcoin spot ETF listings, including XRP, DOGE, LTC, and HBAR, with AVAX and LINK products awaiting approval. This surge follows the SEC's adoption of a universal listing standard and an expedited 8(a) approval mechanism, which has reduced review times from 240 days to as little as 20 days. Grayscale launched DOGE and XRP ETFs on November 24, marking a notable development in the crypto ETF landscape. Despite the rapid increase in listings, market reactions have been mixed. SOL ETFs have attracted the strongest inflows, while LTC and HBAR ETFs have struggled to gain traction. This wave of altcoin ETFs highlights a more institutionalized regulatory approach to cryptocurrency assets in the U.S.