Crypto Trader Loses $2 Million in Same-Block Arbitrage Exploit

Decentralized exchanges use routers to find swap paths across multiple liquidity pools. If a large order is routed through a thinly traded pool, however, the price can become severely distorted in an instant, allowing a block builder that controls transaction ordering to extract maximal extractable value, or MEV. GoPlus Security classified the incident as "same-block backrun extraction," rather than a conventional sandwich attack.

At 1:59 a.m. UTC on July 6, 2026, the trader swapped 1,126.44 ETH worth $2.01 million. The 0x router directed about 1,117 ETH into Uniswap v3's low-liquidity AVAIL/WETH pool, leaving the trader with just 5,776 LIT worth $14,500—a 99.3% loss. Titan Builder captured about $1.8 million.