Ethereum (ETH) block builder Titan Builder extracted $34 million from a single botched $50 million DeFi swap, temporarily making it the top protocol by daily revenue.
The trader attempted to swap roughly $50 million of aEthUSDT into aEthAAVE via CoW Protocol but received only about $35,000 due to extreme slippage and a sandwich attack.
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Why it matters:
- Titan Builder is a neutral Ethereum block builder that specializes in processing Maximal Extractable Value (MEV) bundles for validators and searchers.
- The $34 million extraction shows MEV bots can capture nearly the full value of a poorly routed large trade
- Titan Builder briefly surpassed Tether and Circle in 24-hour revenue on DefiLlama
- The event reignites debate over whether DeFi front-ends adequately protect users from catastrophic execution failures
The details:
- Titan Builder’s bot captured $34 million in ETH and immediately transferred the full amount to Coinbase
- The trader lost over 99% of the $50 million position, receiving roughly $35,000 after the sandwich attack
- Suhail Kakar noted that “the technology works” but poor user experience can easily produce million-dollar losses
- Multiple observers questioned whether the trade could represent money laundering or capital reallocation
- Lookonchain suggests the attack victim may have been Garret Jin.
The big picture:
- MEV extraction remains one of Ethereum’s most persistent structural issues, with builders and searchers competing to reorder transactions for profit
- Sandwich attacks on large swaps highlight the gap between DeFi’s technical capabilities and retail-grade execution safeguards
