Polymarket's Crypto Up or Down 5min markets have expanded from BTC to ETH, SOL, and XRP, fully aligned with the 15min markets. During a full trading day, the 5min markets for BTC, ETH, SOL, and XRP have exceeded $20 million in trading volume, with BTC surpassing $18 million and ETH over $1.5 million. The 15min markets might face further fragmentation, with daily trading volume currently dropping to just over $10 million.