MEV (Maximal Extractable Value)
What is MEV (Maximal Extractable Value)?
MEV (Maximal Extractable Value)The profit that block builders, validators, or searchers can extract by reordering, inserting, or censoring transactions within the blocks they produce.
MEV originated as Miner Extractable Value on Ethereum's Proof-of-Work era and was renamed Maximal Extractable Value after the Merge to cover validators and builders. Searchers scan the mempool and private order flow for profitable opportunities (arbitrage, liquidations, sandwich attacks, NFT sniping, oracle updates) and pay block builders to position their bundles. Tools and infrastructure include Flashbots, MEV-Boost (proposer-builder separation), and SUAVE. MEV is partly value-creating (efficient arbitrage, liquidations) and partly harmful (sandwich attacks, censorship risk). Mitigations include encrypted mempools, fair-ordering protocols, threshold encryption, batch auctions, and application-level slippage and commit-reveal controls.
● Examples
- 01
Flashbots reports cumulative extracted MEV on Ethereum in the billions of USD since 2020.
- 02
A searcher submits a sandwich bundle around a 1 million USD swap to capture price impact.
● Frequently asked questions
What is MEV (Maximal Extractable Value)?
The profit that block builders, validators, or searchers can extract by reordering, inserting, or censoring transactions within the blocks they produce. It belongs to the Web3 & Blockchain category of cybersecurity.
What does MEV (Maximal Extractable Value) mean?
The profit that block builders, validators, or searchers can extract by reordering, inserting, or censoring transactions within the blocks they produce.
How does MEV (Maximal Extractable Value) work?
MEV originated as Miner Extractable Value on Ethereum's Proof-of-Work era and was renamed Maximal Extractable Value after the Merge to cover validators and builders. Searchers scan the mempool and private order flow for profitable opportunities (arbitrage, liquidations, sandwich attacks, NFT sniping, oracle updates) and pay block builders to position their bundles. Tools and infrastructure include Flashbots, MEV-Boost (proposer-builder separation), and SUAVE. MEV is partly value-creating (efficient arbitrage, liquidations) and partly harmful (sandwich attacks, censorship risk). Mitigations include encrypted mempools, fair-ordering protocols, threshold encryption, batch auctions, and application-level slippage and commit-reveal controls.
How do you defend against MEV (Maximal Extractable Value)?
Defences for MEV (Maximal Extractable Value) typically combine technical controls and operational practices, as detailed in the full definition above.
What are other names for MEV (Maximal Extractable Value)?
Common alternative names include: Miner Extractable Value, Maximal Extractable Value.
● Related terms
- web3№ 435
Front-Running (Blockchain)
On-chain trade abuse where an actor sees a pending transaction in the mempool and submits their own transaction first to profit from the predictable price impact.
- web3№ 965
Sandwich Attack
A form of MEV in which an attacker places a buy order before a victim's pending swap and a sell order immediately after, profiting from the artificial price move they induce.
- web3№ 424
Flash Loan Attack
A DeFi exploit that borrows a massive uncollateralised flash loan within one transaction to manipulate prices or governance and steal funds before the loan is repaid.
- web3№ 765
Oracle Manipulation
An attack that distorts the price or data feed used by a smart contract so the contract makes wildly wrong decisions about lending, liquidations, or settlement.
- web3№ 106
Blockchain Security
The discipline of protecting distributed ledgers, their consensus mechanisms, smart contracts, and surrounding infrastructure from compromise, fraud, and theft.
- web3№ 1056
Smart Contract Security
The practice of designing, reviewing, and operating on-chain programs so they cannot be exploited to steal funds, freeze logic, or violate intended business rules.
● See also
- № 00351% Attack