MEV

MEV (Maximal Extractable Value) is the profit that can be extracted by reordering, including, or excluding transactions in a block beyond standard block rewards and fees. It is the on-chain equivalent of high-frequency trading edge, plus features unique to public mempools and smart-contract composability.

By Crypto University EditorialLast updated May 28, 2026

SlippageArbitrage

✦ Key Insight

MEV is paid by ordinary traders, often invisibly, through worse fill prices on swaps and lower returns on LP positions. Understanding MEV — and how to defend against it — is essential for anyone trading on-chain at meaningful size.

✕ Common Misconceptions

Setting wide slippage on large trades, painting a target on yourself.

Using public RPC endpoints when private order flow services exist.

Assuming MEV only affects huge swaps — it scales to whatever size is profitable.

Detailed Explanation

How It Works: Searchers run bots that scan the mempool for profitable patterns: arbitrage across DEXes, liquidations, sandwich attacks against large swaps. They submit bundles to block builders, who include them in the optimal order. Validators receive a share of MEV through proposer-builder separation.

FAQs:

Is all MEV bad? No — arbitrage MEV often improves market efficiency. Sandwich MEV is purely extractive.
How do I avoid being MEVed? Use private RPCs (Flashbots Protect, MEV Blocker), tight slippage, and intent-based execution where possible.

In Practice

“A trader submits a $200,000 swap with 1% slippage tolerance. A searcher sandwich-attacks the trade — buying right before, selling right after — capturing most of the trader's slippage budget as MEV.”

Dig Deeper

Arbitrage

Arbitrage is a trading strategy where a trader buys the same crypto asset on one exchange at a lower price and sells it on another exchange at a higher price. The goal is to profit from the temporary price difference between markets.

Slippage

The difference between the expected price of a trade and the actual executed price, usually due to volatility or low liquidity.

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MEV