Golden Finance reported that a cryptocurrency trader was suspected of encountering a "sandwich attack" when trading in the USDC-USDT liquidity pool of Uniswap V3 on Wednesday, causing his $732,000 USDC to only $18,600 USDT, losing more than $700,000. According to on-link data analysis, this event may be initiated by a MEV (Maximum Extractable Value) robot. The bot cleared the liquidity pool by preemptive transactions, causing price imbalances and paying block builders to prioritize their transactions. DeFi researcher Michael Nadeau pointed out that this attack uses transaction sequence to manipulate prices to make a profit. In addition, some analysts speculate that such abnormal transactions may be part of money laundering. DeFiLlama developer 0xngmi said that by constructing transactions that are easily arbitrageable by MEV robots, money launderers can transfer funds with almost zero losses. At present, the incident is still under further investigation.