Real-time Invariant Monitoring: Lessons from the $1.4M Ekubo Exploit

The Incident: What Happened to Ekubo? On May 6, 2026, Ekubo Protocol (a major liquidity layer) faced a $1.4M exploit. While the core liquidity remained safe, the vulnerability resided in the EVM extension router. The attacker exploited a flaw in the Payment Callback logic, manipulating token transfers from users who had granted maximum approvals to the contract. This wasn't a flaw in the AMM math itself, but a failure in access control and state validation during cross-chain interactions. The So