MEV bot steals $370,000 from a phishing victim’s $500,000 loss on the Base chain

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On-chain reports indicate that on August 7 (UTC+8), a Base chain user lost 500,000 USDC in a phishing attack. The attacker attempted to swap the funds to WETH but failed to set slippage limits, routing the trade to a low-liquidity Uniswap V4 pool. The trade returned only 67.9 ETH ($129,000), with $370,000 captured by an MEV bot reported in ETH news. The bot paid 0.03 USDC to front-run the trade and spent 3.5 ETH in gas fees. The victim later sent on-chain messages to both the attacker and the MEV address, offering a 10% bounty for a refund.

According to ME News, on August 7 (UTC+8), GoPlus monitoring revealed that a user on the Base chain lost 500,000 USDC due to a phishing attack. When the attacker attempted to convert the stolen funds into WETH, their script lacked slippage protection, routing the transaction through a Uniswap V4 WETH/USDC pool with nearly no liquidity. As a result, the 500,000 USDC were exchanged for only 67.9 ETH (worth $129,000), with $370,000 siphoned off by MEV bots. The MEV bot front-ran the transaction by paying just 0.03 USDC but incurred a gas fee of 3.5 ETH. Subsequently, the victim sent on-chain messages to both the attacker and the MEV address, claiming to have identified the attacker’s identity and offering a 10% bounty in exchange for a refund. (Source: ChainCatcher)

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