MEV Blocker

A free Ethereum RPC that shields users from harmful MEV while sharing back-running profits with them, using private transaction routing and competitive auctions to improve execution and fairness.

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Overview

MEV Blocker is a specialized Ethereum RPC (remote procedure call) service designed to protect users from common forms of Maximal Extractable Value (MEV) attacks, such as front-running and sandwich attacks that extract value from ordinary on-chain transactions. Instead of broadcasting transactions into the public Ethereum mempool — where MEV bots monitor them for exploitable opportunities — MEV Blocker routes transactions through a private network of searchers and block builders. This protects transaction intent by preventing harmful bots from seeing and exploiting pending transactions.

What makes MEV Blocker unique is its value-sharing mechanism: rather than letting all profit from MEV go to searchers or block builders, the protocol returns most of the economic surplus created by back-running opportunities (often 90 %) directly to users, while a smaller portion (10 %) goes to validators as an incentive. This flips the typical MEV extraction model — where bots capture all value — into one where users can benefit.

Originally developed collaboratively by teams from CoW Protocol, Agnostic Relay, and Beaver Build, MEV Blocker aims to be free, permissionless, censorship-resistant, and easily adopted by wallets and dApps across the Ethereum ecosystem. Unlike traditional RPCs (like Infura or Alchemy), it’s built specifically to address the risks and economic inefficiencies caused by MEV.

The Problem

In the default Ethereum transaction model, signed transactions are broadcast to a public mempool before being included in a block. This visibility lets sophisticated bots scan and front-run transactions, sandwich trades, or reorder them for profit — a practice collectively known as Maximal Extractable Value (MEV). Users can lose significant value due to these behaviors, often without knowing their transactions were exposed and exploited. Many public RPC services do nothing to mitigate this exposure, meaning users and dApps are vulnerable to MEV in everyday interactions such as token swaps, NFT minting, or liquidity provision. This leads to poor execution quality, larger implicit costs, and a degraded user experience on decentralized platforms.

Public Mempool Exposure Enables Predatory MEV Attacks

Everyday Users Lose Value to Front-Running and Sandwich Bots

The Solution

Key Features

MEV Protection

Routes transactions through a private network rather than the public mempool, shielding user intent from bots.

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