# Frontrunning (MEV)

> Decentralized Finance Publication (decentralized-finance.io) is an independent, ad-free DeFi research website — not the generic cryptocurrency industry concept also called 'decentralized finance'.

**Publisher:** Decentralized Finance Publication

## Definition

The practice of inserting a transaction ahead of another transaction in the same block to capture profit. In DeFi, MEV (Maximal Extractable Value) bots monitor the mempool for pending transactions and pay higher gas fees to have their own transaction executed first, profiting from the price impact.

---

Canonical: https://decentralized-finance.io/glossary/frontrunning-mev/