MEV-Share

MEV-Share is an open-source protocol developed by Flashbots that enables users, wallets, and decentralized applications to participate directly in the economic value generated by MEV (Maximal Extractable Value) that their transactions create on Ethereum. Traditionally, MEV profits — derived from transaction ordering, arbitrage, or liquidation opportunities — are captured by searchers, builders, and validators. MEV-Share introduces a mechanism to redistribute a portion of that value back to orderflow originators, meaning users and the tools they use can benefit from the value their transactions generate instead of it being captured exclusively by sophisticated actors.

At its core, MEV-Share is a permissionless orderflow auction protocol that sits alongside Flashbots’ other infrastructure. It creates a matchmaking layer (often called the “Matchmaker”) that can take user transactions — typically submitted via private channels like Flashbots Protect RPC — and expose programmable, privacy-controlled hints about them to searchers. Searchers can then bid to include their own MEV-capturing transactions in the same bundles as the user’s transaction. When these combined bundles are accepted by a block builder and included in a block, part of the resulting MEV revenue is returned to the user or wallet that provided the orderflow via MEV-Share’s redistribution rules.

Unlike Flashbots Protect, which simply hides transactions to prevent harmful MEV extraction (front-running, sandwiching), MEV-Share actively shares positive value. It allows users to choose how much transaction information is shared with searchers, balancing privacy with reward potential. This programmable privacy model empowers users, wallets, and dApps to engage in MEV extraction strategies responsibly while aiming for fair and transparent value distribution across participants.

MEV-Share is part of Flashbots’ broader goal to democratize MEV participation and build a more equitable, transparent MEV ecosystem. By enabling orderflow originators to internalize the value of their own transactions and actively participate in the MEV supply chain, the protocol reduces the centralizing effects of exclusive orderflow and encourages broader, permissionless competition among MEV searchers and builders.