Coinbase has delisted several perpetual contracts, including EDGE-PERP, PROMPT-PERP, 1000SATS-PERP, FLOW-PERP, AR-PERP, MANTLE-PERP, and HNT-PERP, as part of a strategic move to enhance market quality. The exchange automatically settled all open positions in these contracts using USDC, based on the average index price over the 60 minutes preceding the suspension. The decision aims to improve liquidity and streamline Coinbase's perpetual contract offerings by focusing on products with higher trading volumes. This move is also intended to facilitate a more efficient listing process for new perpetual contracts in the future.