How $50 Million Disappeared in 30 Seconds: A Code-Level Autopsy Block 24643151. March 12, 2026. Transaction index: 1. Status: Success. That last word is what makes this worth dissecting. Nothing was …

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A $50M loss occurred in a single Ethereum transaction on March 12, 2026, when a whale attempted a collateral swap via Aave's frontend using CoW Protocol. The root cause was a catastrophically low minBuyAmount (~$36K for a $50M sell) computed by the frontend, which routed the entire trade through a SushiSwap v2 AAVE/WETH pool with only ~$73K in liquidity. The constant product AMM math is dissected in detail: injecting 17,957 WETH into a pool with 17.65 WETH reserve caused 1,388x price deviation. Every contract layer — CoW settlement, Aave adapter, SushiSwap — executed correctly per its specification. The failure was the absence of economic reasonableness checks anywhere in the stack. An MEV arbitrageur extracted most of the value in the very next transaction. Aave responded with 'Aave Shield,' a protocol-level hard revert for trades exceeding 25% price impact. The core argument: DeFi is excellent at enforcing what users sign, but still fails to prevent presenting users with absurd things to sign.