Maximal Extractable Value (MEV)
Web3 / defi
Maximal Extractable Value refers to the maximum profit that validators, miners, or other block producers can extract from their ability to order, include, or exclude transactions within a block. This occurs because block producers see pending transactions in the mempool before they're finalized, allowing them to front-run transactions, sandwich trades, or reorder them for personal gain. MEV represents a fundamental tension in blockchain design between decentralization and the incentive structures that allow participants to profit from information asymmetries. Example: Flashbots, an organization focused on MEV research, created MEV-Geth and MEV-Relay to help Ethereum validators extract MEV more transparently through a standardized auction mechanism rather than through opaque front-running practices. Why it matters for DeFi: MEV directly impacts DeFi users through slippage, failed transactions, and diminished returns. Understanding MEV helps users protect themselves from sandwich attacks and informed liquidity providers can price this risk accordingly into their yield expectations.
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