October 2025 brings key ETF deadlines for Cardano, XRP, Solana, Chainlink & Stellar, with rulings that could reshape altcoin adoption. Altcoin ETFs near SEC decisions as Cardano, XRP, and Solana face October deadlines—analysts see potential for major institutional inflows. October has long been a pivotal month for cryptocurrencies, and in 2025, the spotlight is on altcoin exchange-traded funds (ETFs). With clustered deadlines at the U.S. Securities and Exchange Commission (SEC), projects like Cardano, Ripple’s XRP, Solana, Chainlink, and Stellar are preparing for decisions that could reshape institutional adoption of digital assets.