An altcoin season is gaining momentum in 2025, with Ethereum (ETH) surging to $2,469 (up 11.4% from $2,217 yesterday) and Solana (SOL) reaching $171 (up 5.6% from $162) on May 10. Bitcoin (BTC) also climbed to $103,000, continuing its steady ascent. Per CoinMarketCap’s Altcoin Season Index, altcoins often surge when the top 100 outperform BTC—ETH and SOL’s gains signal this shift, reminiscent of May 2021’s 130% rally. Regulatory clarity from the USHouseMarketStructureDraft, BTC’s ETF-driven momentum, and ETH’s Apple Pay integrations are fueling this altcoin surge, hinting at a broader breakout.