Optim Finance, a Cardano-native decentralized finance (DeFi) protocol, said a Splash Protocol pool supporting OADA was exploited, leaving the pool’s OADA and ADA under an attacker’s control. The same actor subsequently emptied other venues where OADA traded against various tokens, removing all reported OADA liquidity and effectively wiping out its on-chain market. Optim Finance paused the protocol, withdrew remaining liquidity and advised users not to provide liquidity for OADA or its governance token O. OADA is minted 1:1 against ADA, but has no direct redemption route; its only documented exit is through the OADA/ADA stableswap on Splash Protocol. The incident therefore affects both conversion and the mechanism used to defend the token’s 0.99-to-1.01 ADA peg. Exact losses, transaction hashes, attacker addresses and the technical cause remain undisclosed. The base Cardano blockchain was not implicated, with the incident described as confined to application-layer liquidity. CoinGecko data showed ADA at $0.2047, down 1.8% over 24 hours, with a $7.686 billion market cap on September 13, 2026, at 10:43 AM UTC. Optim Finance said more information would follow.