Crypto investor turns $50M into $36,000 in one botched move
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Crypto trader lost nearly all of $50 million in one botched DeFi transaction Markets Share Share this article Copy link X icon X (Twitter) LinkedIn Facebook Email Crypto investor turns $50 million into $36,000 in one botched move Aave founder Stani Kulechov said the interface displayed multiple slippage warnings, which the user manually accepted on a mobile device. By Krisztian Sandor | Edited by Aoyon Ashraf Updated Mar 13, 2026, 8:46 a.m. Published Mar 12, 2026, 10:19 p.m. Make us preferred on Google (Shutterstock/Rainer_81) What to know : A crypto trader lost about $50 million in a single transaction after swapping interest-bearing aEthUSDT for aEthAAVE through CoW Protocol. Large losses by slippage occasionally occur in decentralized finance (DeFi) when traders attempt to execute unusually large orders against shallow liquidity pools, with arbitrage bots exploiting the price dislocation. Aave founder Stani Kulechov said the interface had warned the user about extraordinary slippage and required explicit confirmation, which the user confirmed on their mobile device. A crypto user lost roughly $50 million in a single transaction on Thursday after executing a large token swap that triggered massive slippage. Blockchain data shows that the wallet attempted to swap $50,432,688 aEthUSDT – an interest-bearing token representing Tether's USDT stablecoin deposited into the Aave decentralized lending protocol on the Ethereum network – for aEthAAVE – similar version of Aave governance tokens – through the CoW Protocol. The transaction executed with more than 99% slippage due to thin liquidity in the relevant trading pools, leaving the wallet with only about 327 aEthAAVE tokens, worth roughly $36,000 after the trade. The difference of the value was quickly captured by arbitrage traders and network intermediaries. Within the same block — or batch of transactions recorded on the blockchain at once —, arbitrageurs extracted more than $43 million in profit, blockchain security firm BlockSec told CoinDesk. Of that, $32.6 million went to the block builder, the specialized party that assembles and orders transactions before the block is finalized. Large losses caused by slippage occasionally occur in decentralized finance (DeFi) when traders attempt to execute unusually large orders against shallow liquidity pools. In such cases, automated arbitrage systems rapidly exploit the price dislocations created by the trade. Stani Kulechov, founder of the Aave protocol, said the trade went through despite multiple warnings presented to the user before confirming the transaction. “Earlier today, a user attempted to buy AAVE using $50M USDT through the Aave interface,” Kulechov said in an X post . “Given the unusually large size of the single order, the interface warned the user about extraordinary slippage and required confirmation via a checkbox.” According to Kulechov, the user accepted the warning on their mobile device and proceeded with the trade, explicitly acknowledging the risk of high slippage. "The transaction could not be moved forward without the user explicitly accepting the risk," he said, adding that the CoW Swap routers functioned as intended and followed standard industry practices. Still, the outcome was "clearly far from optimal," Kulechov said. Kulechov said Aave plans to contact the affected user and return roughly $600,000 in fees collected from the transaction. The loss comes just few days after about $27 million was liquidated on Aave, in what some market participants say may have been caused by a temporary pricing issue involving the token wstETH. UPDATE (March 13, 8:45 UTC): Adds context of the transaction from blockchain securitiy firm BlockSec. Decentralized Finance Aave Token Swap More For You Bitcoin outperforms stocks, tops $72,000 even as dollar strengthens By Oliver Knight , Omkar Godbole | Edited by Sheldon Reback 7 minutes ago BTC climbed 2% to break through $72,000 while U.S. equity futures slipped and the dollar strengthened, as altcoins and AI tokens joined a broader crypto rally. What to know : BTC rose 2% since midnight UTC, climbing through $72,000 and outpacing Nasdaq 100 and S&P 500 futures, even as the dollar index (DXY) climbed above 100. A high-volume break above $74,000 could trigger a move toward $80,000, while rejection would likely keep BTC in the range seen since Feb. 5. 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