Trader Executes $50M Swap with 99.9% Price Impact
On March 12, a crypto trader incurred a catastrophic loss of nearly $50 million in a single transaction on the Aave protocol. The user's wallet attempted to swap $50,432,688 of aEthUSDT for aEthAAVE tokens through the CoW Protocol. The trade executed with a price impact of over 99% due to thin liquidity in the trading pool, leaving the wallet with only 327 aEthAAVE tokens, worth approximately $36,000. The value difference was instantly captured by arbitrage traders and network intermediaries who exploit such price dislocations.
Aave Confirms User Ignored Warnings, Offers $600K Fee Refund
Aave founder Stani Kulechov confirmed the user manually accepted the transaction's terms despite explicit platform warnings. The Aave interface flagged the "extraordinary slippage" and required the user to confirm their acknowledgment via a checkbox on a mobile device. An Aave engineer clarified the core issue was an extremely poor initial quote, showing a potential return of fewer than 140 AAVE for the $50 million input, rather than slippage during execution. In a goodwill gesture, the Aave team stated it would attempt to contact the affected user and return approximately $600,000 in fees generated from the swap. Kulechov also commented on the protocol's future direction.
The key takeaway is that while DeFi should remain open and permissionless, allowing users to perform transactions freely, there are additional guardrails the industry can build to better protect users. Our team will be investigating ways to improve these safeguards going forward.
— Stani Kulechov, Founder of Aave
Transaction Echoes Past Multi-Million Dollar Slippage Losses
This incident, while extreme in scale, underscores a persistent risk within DeFi for large market orders in illiquid pools. It joins a history of similar costly user errors. In November 2025, a Cardano holder swapped $6.9 million worth of ADA and received only $850,000 in value. A separate incident in early 2024 saw a buyer lose $5.7 million on a $9 million Dogwifhat (WIF) token purchase due to severe slippage. These events demonstrate how automated systems are designed to instantly capitalize on user miscalculations, reinforcing the need for traders to break up large orders and closely monitor price impact before confirming transactions.
