Mempool Exploitation

Mempool Exploitation involves monitoring the pool of unconfirmed transactions to identify profitable opportunities, such as arbitrage or liquidation, before they are finalized on-chain. Attackers scan the mempool for pending transactions that interact with decentralized exchanges and use that information to construct their own transactions.

By setting higher gas prices, they ensure their transaction is processed first, allowing them to capture the profit or displace the original user. This practice is a primary driver of Miner Extractable Value, or MEV, which has become a significant economic force in crypto markets.

It forces protocols to adopt privacy-preserving transaction submission methods to protect users. Effectively, it is a game of speed and information asymmetry played at the protocol level.