Onchain perpetual futures platforms now account for roughly 14.9% of total perp trading volume, a share that has climbed steadily over the past 18 months as centralized exchange activity softens. CEX volumes hit a rough patchCombined trading volumes across major centralized exchanges fell to $4.41 trillion in May 2026, the lowest figure recorded since September 2024. That relative resilience is what pushed the market share figure from low single digits to nearly 15% over roughly an 18-month window. Platforms like Aster and Lighter have emerged as credible competitors, carving out meaningful portions of weekly onchain volume. Aster, for instance, reached approximately 14.9% of weekly onchain trading volumes in a snapshot from September 2025.