A DeFi trader lost nearly $50M on a single AAVE swap, receiving just 324 tokens. Here’s how it happened and where the money went.
A crypto trader triggered one of the most costly DeFi swaps recorded so far this year. The trader attempted to buy AAVE using $50 million in USDT through the Aave interface.
The result was staggering.
Instead of receiving thousands of tokens, the trader ended up with just 324 AAVE. The incident has since sparked a wide conversation about DeFi guardrails and user responsibility.
How the $50M AAVE Swap Went So Wrong
According to Aave founder Stani Kulechov, the interface displayed a clear slippage warning before the trade went through.
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
The system required the user to manually check a confirmation box accepting the risk. The trader confirmed the warning on a mobile device and proceeded anyway.
Kulechov confirmed that CoW Swap routers worked as intended. The integration also followed standard industry practices.
However, the outcome was far from ideal given the size of the transaction. He noted that events like this do happen in DeFi, but rarely at this scale.
The trader, posting on X under the handle @kingfxyo, described the trade as the “second worst” of his life.
He acknowledged clicking through the slippage warning, thinking it would be fine. It was not.
Related reading: Aave Labs Shuts Down Avara Brand and Refocuses on Core Lending Protocol
Where Did the $49.97 Million Go?
Crypto analyst Nicki Sanders broke down the mechanics behind the loss on social media. She explained that the funds did not simply vanish.
Instead, they were redistributed across the market to several parties.
Sanders explained that automated market makers price trades along a curve. When a massive order hits a shallow liquidity pool, the price moves sharply with each token purchased. Early AAVE in the swap sold near market price.
A lot of people are asking what happened to the ~$49.97M the trader “lost” in the $50M AAVE trade.
The short answer: it didn’t disappear. It went to liquidity providers and arbitrage traders.
Here’s what likely happened.
The trader tried to buy ~$50M of AAVE in a single swap…
— Nicki Sanders (@nickisanders) March 13, 2026
Later AAVE in the same swap sold at severely inflated prices. That gap is what created the enormous slippage.
Liquidity providers received the bulk of the USDT from the swap. Arbitrage bots also jumped in quickly, selling AAVE back into the pool at inflated prices and pocketing the difference. The protocol also collected trading fees from the transaction.
Aave later confirmed it would return $600,000 in fees collected from the trade. The team also stated it plans to investigate better safeguards for large transactions going forward.
