MEV (Maximal Extractable Value): What It Is and Why It Matters

MEV (Maximal Extractable Value): What It Is and Why It Matters When I first deployed a liquidity pool contract on Mainnet, I watched a $50k swap get sandwiched in the same block and couldn't figure out where the slippage went. Took me way too long to realize someone had inserted a transaction ahead of mine, moved the price, and I paid for it. That was my introduction to MEV, and honestly, it broke my brain for like two weeks. MEV is the value that can be extracted from a blockchain by reordering, inserting, or censoring transactions within a block. It's profit that goes to whoever controls block ordering—miners on PoW, validators on PoS, or more commonly these days, searchers and builders. The kicker: this value comes out of users' pockets . A user sends a swap on Uniswap. A searcher sees it in the mempool, runs a simulation, realizes they can buy the token before the user's transaction lands (driving the price up), then sell after. They pocket the difference. The user gets worse execu