Crypto Trader Burns $50M in AAVE Swap After 99% Slippage
- A wallet swap on Aave erased nearly $50M after liquidity failed in one brutal trade.
- Block builders and arbitrage bots captured over $43M as the swap unraveled at once.
- Aave said the user saw repeated slippage warnings yet still approved the risky order.
A crypto wallet lost roughly $50 million in a single decentralized finance transaction on Thursday after executing a large token swap that triggered extreme slippage. Blockchain records show the wallet attempted to swap $50,432,688 in aEthUSDT for aEthAAVE through the CoW Protocol, but the trade returned only about 327 tokens worth roughly $36,000. The loss occurred when thin liquidity in the trading pools caused the transaction to execute with more than 99% slippage.
As a result, arbitrage traders quickly captured most of the lost value within the same blockchain block. Data from blockchain security firm BlockSec shows that arbitrageurs extracted more than $43 million in profit from the transaction. Of that amount, about $32.6 million went to the block builder responsible for ordering transactions before the block finalized.
The transaction involved aEthUSDT, an interest-bearing token that represents Tether’s USDT deposited into the Aave lending protocol on Ethereum. The trade attempted to acquire aEthAAVE, which represents deposited Aave governance tokens.
So how could a single trade erase tens of millions of dollars within seconds?
Massive Slippage During Token Swap
Blockchain data show the wallet attempted to swap $50,432,688 in aETHUSDT via the CoW Protocol trading interface. The transaction targeted aEthAAVE tokens tied to Aave’s governance asset.
However, the order size far exceeded available liquidity in the relevant trading pools. As the trade was executed, the automated market mechanism adjusted prices dramatically. That shift pushed slippage beyond 99%.
As a result, the wallet received only about 327 aEthAAVE tokens. After the trade completed, those tokens held an estimated value of roughly $36,000.
Meanwhile, the missing value flowed directly to arbitrage traders and transaction intermediaries. Automated trading systems quickly exploited the price difference created by the oversized swap.
BlockSec said that arbitrageurs captured more than $43 million from the transaction during the same blockchain block. Of that amount, about $32.6 million went to the block builder responsible for assembling and ordering the transactions.
Aave Founder Says User Confirmed Slippage Warning
Stani Kulechov, founder of the Aave protocol, addressed the incident in a post on X. He explained that the user initiated the trade through the Aave interface using $50 million in USDT. Kulechov stated that the trading interface warned the user about extraordinary slippage before the transaction was executed. The interface required confirmation through a checkbox before allowing the swap to proceed.
“Earlier today, a user attempted to buy AAVE using $50M USDT through the Aave interface,” Kulechov wrote on X.
He added that the interface displayed a warning due to the unusually large order size. The user confirmed the warning on a mobile device and proceeded with the transaction.
According to Kulechov, the confirmation accepted the high slippage conditions, which ultimately produced the final trade result. The system, therefore, executed the swap after the user confirmed the risk.
Related: A Crypto Trader Made $2.3M Fortune Over The Past Month
DeFi Guardrails and Governance Debate
Following the incident, Kulechov said the scale of the loss exceeded typical slippage events seen in decentralized finance markets. He also expressed sympathy for the affected user. “We sympathize with the user and will try to make contact with the user and we will return $600K in fees collected from the transaction,” Kulechov said.
He also noted that the industry could add stronger safeguards while keeping decentralized finance permissionless. The Aave team plans to review ways to strengthen protections to help users avoid similar outcomes.
Earlier in the week, Kulechov discussed broader structural challenges within decentralized governance. In a separate post on X, he said decentralized autonomous organizations often struggle with slow decision-making processes.
He wrote that DAO governance often requires weeks of forum discussions, temperature checks, and multiple votes before proposals advance. Kulechov also described how governance systems can become politicized as participants align behind competing proposals.
“Participants take sides, lean toward the loudest voices, and form political alliances to get their own proposals passed later,” he wrote. He added that DAOs sometimes reward political influence rather than operational efficiency, which can slow innovation within crypto projects.
