TL;DR
- Trader loses $50.4 million in USDT due to extreme slippage on Aave.
- The failed swap bought only $36,000 worth of AAVE tokens.
- MEV bots and block builders captured nearly $44 million from the error.
A trader swapped $50.4 million in USDT for just $36,000 worth of AAVE tokens on the Ethereum network, marking one of the most costly slippage errors ever recorded in DeFi. The transaction ran through the Aave interface, which displayed explicit warnings about the extraordinary risk of the operation before processing it.
Aave founder Stani Kulechov confirmed the incident on X and clarified that the platform used its standard routing infrastructure, including CoW Swap, to process the swap. The system generated clear alerts about the extreme slippage a order of that size would produce and required manual risk confirmation.
Earlier today, a user attempted to buy AAVE using $50M USDT through the Aave interface.
Given the unusually large size of the single order, the Aave interface, like most trading interfaces, warned the user about extraordinary slippage and required confirmation via a checkbox.…
— Stani.eth (@StaniKulechov) March 12, 2026
Where the Money Went: Bots, Block Builders, and Fees
The $50 million did not disappear. It redistributed across the various actors that make up DeFi infrastructure:
- Trader: received AAVE worth $36,000
- CoW Swap fees: approximately $619,000
- MEV bots (automated arbitrage traders): more than $9.9 million
- Block builder who processed the transaction: more than $34 million
Expert Nicki Sanders explained the mechanics on X: the trader attempted to buy $50 million worth of AAVE through a single liquidity pool, but the pool lacked sufficient depth to absorb the volume. The first tokens were purchased at market price, but each subsequent purchase pushed the price higher within the pool, generating cumulative slippage that consumed nearly all the capital.
Arbitrage bots detected the price distortion in real time and sold AAVE at inflated prices, capturing the difference. The block builder — who determines the order of transactions within each Ethereum block — extracted the largest share of available value.
Kulechov announced that the Aave team plans to return approximately $600,000 in fees generated by the operation and is actively trying to contact the affected wallet’s owner.
Is Garrett Jin the “Mystery Whale” Behind the Error?
On-chain analysts point to trader Garrett Jin as the likely person behind the operation. According to Lookonchain data, 13 wallets linked to Jin received USDC and USDT from Binance on February 16 and 20, reactivated on the day of the incident, and moved funds into two new wallets. One of them used the same Binance deposit address previously associated with Jin.
The timeline reinforces the connection. On February 15 and 20, Jin sold 261,024 ETH ($543 million) and 11,318 BTC ($761 million) — operations that coincided with the stablecoin withdrawals from Binance toward the wallets linked to the incident.
The case exposes a structural limitation of DeFi relative to traditional finance. In conventional markets, operations of that size run through OTC desks or automated trading systems that manage price impact. In DeFi, the system executes exactly what the user requests, with no intermediaries to correct mistakes. The full cost of an error of this magnitude falls entirely on whoever signs the transaction.
