Order Book Frontrunning

Mechanism

Order book frontrunning describes the practice where a participant, typically a miner or validator, utilizes advance knowledge of pending transactions to insert their own orders ahead of a target execution. This process relies on observing the mempool or order stream to identify high-value trades that will inevitably shift market prices upon arrival. By adjusting transaction priority through gas fees or priority fees, the entity secures a more favorable position in the ledger, effectively harvesting slippage from the original trader.