$50M Crypto Trade Turns Into $36K After Massive Slippage on Aave and CoW Protocol

• A trader lost $50M after a swap faced 99% slippage on CoW Protocol.
• Despite warnings, the user confirmed the trade and received only about $36K.

A crypto trader lost almost $50 million in a single transaction after executing a large token swap on the decentralized trading platform CoW Protocol in interaction with the assets linked to the Aave on the Ethereum Network.

What really happened

Blockchain data shows that the trader tried to convert about $50.43 million worth of aEthUSDT into aEthAAVE tokens. Because the order was large, the swap was executed with more than 99% slippage. The trader received only 327 aEthAAVE tokens, which are worth around $36,000. 

Skippage was the main reason for this loss. This type of event occurs when a large trade changes the price of an asset while the transaction is being executed. In decentralized finance, trades are executed through liquidity pools. If a trader attempts to execute a very large order against a pool with limited liquidity, the price can shift dramatically.

Stani Kulechov says that the platform displayed several warnings before the trade was completed. He explained that the interface flagged the transaction as having extraordinary slippage risk due to its size. Kulechov said the platform’s trading systems functioned as intended and followed standard industry practices.

In decentralized finance, arbitrage bots constantly monitor blockchain transactions. When a large trade causes a sudden price imbalance, these bots immediately step in to profit from the difference. Aave said it plans to contact the affected user. The protocol intends to return about $600,000 in transaction fees generated from the trade. Even though the platform provided warnings, the user proceeded with the trade, resulting in one of the most dramatic single-transaction losses seen in decentralized finance.

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