What Is a Private Transaction Relay and Why Is It Effective against MEV?

A private transaction relay is a network service (like Flashbots) that allows users to send transactions directly to block producers (miners/validators) without broadcasting them to the public mempool. This prevents front-running bots, which rely on monitoring the public mempool, from ever seeing the pending order.

The block producer can include the transaction in a block while keeping it private, effectively eliminating the MEV opportunity for external actors.

How Does a Private Transaction Relay on a DEX Work?
How Does Maximal Extractable Value (MEV) Relate to Front-Running in Decentralized Finance?
How Does a “Private Transaction Relay” Help Mitigate the Risk of MEV and Front-Running?
How Do Private Transaction Relays Prevent the Visibility Required for Front-Running?
What Is the Difference between a Public Mempool and a Private Transaction Pool?
How Do ‘Private Transaction Relays’ Attempt to Mitigate Front-Running from the Mempool?
How Can a User Submit a Transaction Directly to a Validator, Bypassing the Public Mempool?
How Does Miner Extractable Value (MEV) Relate to Front-Running in Decentralized Finance (DeFi)?

Glossar