MEV — Maximal Extractable Value — is the profit that block builders and validators can extract by reordering, inserting, or censoring transactions within a block. The most common form affecting retail users is the sandwich attack: a bot sees your pending swap in the mempool, front-runs it with a buy (pushing the price up), lets your trade execute at the worse price, then back-runs with a sell (capturing the difference). You get a worse price. The bot profits. It happens in milliseconds.
On Ethereum, MEV extraction has been formalized through Flashbots and the MEV supply chain. Block builders compete to construct the most profitable blocks, proposers select them, and the MEV is partially redistributed to validators. The system is more transparent than the “dark forest” mempool era but still extracts significant value from retail users. Estimates suggest MEV bots have extracted billions of dollars from Ethereum users since 2020.
Solana’s MEV landscape is different but equally aggressive. Jito’s modified validator client captures MEV and redistributes it to stakers, which is better than pure extraction but still means retail traders pay an implicit tax. During the 2024 memecoin mania, Solana priority fees (tips to validators for faster inclusion) sometimes exceeded the value of the trade itself for small transactions.
Protection against MEV is improving. Private transaction pools (Flashbots Protect on Ethereum, Jito bundles on Solana) let users submit transactions that skip the public mempool. Some wallets and DEX aggregators route through MEV-protected channels by default. But the arms race continues: as protection improves, extraction techniques get more sophisticated, and the MEV tax on retail trading remains one of the most significant and least understood costs in crypto.
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