MEV Explained: How Transaction Ordering Costs DeFi Users

If you have ever paid more than expected on a swap or watched a liquidation happen a heartbeat before your repay, you have felt MEV take a bite. It is not a single attack. It is the structural side effect of how blockchains decide who gets into a block and in what order.

We will walk through what MEV actually is in plain terms, where the ordering power sits today, the ways it shows up on your PnL, and what you can do right now to leak less value. No scare tactics. Just the mechanics, some real-world patterns, and practical fixes.

None of this is financial advice. It is about market plumbing. And a lot of it is fixable with better tools and a couple of habits.

Point Details MEV is ordering power Whoever influences which transactions land first can extract value from price impact, liquidations, and mispriced trades. Sandwiching is the everyday tax Your market order moves price, then a bot buys before you and sells after you, capturing the slippage you created. Builders and validators split the pie On Ethereum, searchers, builders, and validators coordinate via MEV-Boost and private routes that reorder and bundle flow. Users can cut leakage Batch auctions, private RPCs, intents-based routers, tighter slippage, and limit orders reduce your exposure. Chain design matters L2s have sequencers with different policies. Solana uses local fee markets and Jito. Each setup changes where MEV appears.

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