
DeepBook faced a $239,700 bad debt event in its USDC margin pool on May 9 due to rapid collateral value drops during volatile market conditions. The protocol paused margin trading quickly to prevent further losses, maintaining solvency through its insurance fund and avoiding user losses. This incident highlights the fragility of leveraged DeFi systems under fast market swings and the challenges of liquidation speed. While DeepBook contained the issue within its $16 million liquidity ecosystem, repeated stress events may impact user confidence in leveraged on-chain trading.