A crypto trader lost almost the entire value of a $50 million transaction on Thursday after executing a large swap for Aave’s governance token through the decentralized finance protocol’s trading interface.
Because the order was unusually large relative to available liquidity, the interface issued a warning flagging “extraordinary slippage” and required the user to manually confirm the risk.
The trader then proceeded with the swap on a mobile device after checking a confirmation box.
That transaction ultimately returned just 324 AAVE tokens. At a current market price of $111.52, the tokens are worth roughly $36,100, implying an effective loss of about $49.96 million relative to the original order size.
Kulechov said the trade was routed through CoW Swap, a decentralized trade-routing system integrated into the Aave interface, and that the infrastructure functioned as designed.
“The transaction could not be moved forward without the user explicitly accepting the risk,” Kulechov wrote. “However, while the user was able to proceed with the swap, the final outcome was clearly far from optimal.”
Large trades executed through decentralized exchanges can cause severe price impact when liquidity is insufficient or when orders are not broken into smaller increments.
Professional traders typically split large orders across multiple transactions or use execution algorithms to reduce market impact or minimize slippage.
Kulechov said the incident shows how decentralized finance platforms may need stronger guardrails to help prevent extreme user errors while preserving permissionless access.
"Our team will be investigating ways to improve these safeguards going forward," Kulechov said.
The incident comes as Aave’s usage has surged.
