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

Kucoin • August 7, 2026

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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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

MEV Bot Steals $370K from Phishing Victim on Base Chain On August 7, 2026, a user on the Base chain lost 500,000 USDC due to a phishing attack. The attacker attempted to convert the stolen funds to WETH but used a script without slippage protection, leading to a transaction through a low liquidity Uniswap V4 pool. This resulted in only 67.9 ETH being received, valued at $129,000, while $370,000 was siphoned off by MEV bots. The MEV bot front-ran the transaction by paying just 0.03 USDC and incurred a gas fee of 3.5 ETH. The victim has since sent on-chain messages to both the attacker and the MEV address, claiming to have identified the attacker and offering a 10% bounty for a refund. 3 sources 63

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

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