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MEV Relay

1 min read
Pronunciation
[M-E-V ree-lay]
Analogy
Like an auction house that collects bids from art dealers and delivers the winning piece to the gallery owner.
Definition
A network service that facilitates the auction of block-building rights between builders and validators, transporting block proposals and bids in the MEV-Boost architecture.
Key Points Intro
MEV relays coordinate block proposal auctions to distribute MEV revenue efficiently.
Key Points

Authenticated transport: Ensures integrity of bids and proposals.

Auction logic: Selects highest-value block for each slot.

Redundancy: Validators connect to multiple relays for reliability.

Transparency: Public monitoring of bids and builder performance.

Example
Flashbots operates an MEV relay where builders submit bids for slot 123456, and validators fetch the winning block proposal.
Technical Deep Dive
Relay implements protobuf/gRPC APIs: `RegisterValidator`, `PublishBlindedBlock`, `GetPayload`. It enforces builder authentication via JWT and logs bids to a public monitoring endpoint.
Security Warning
Malicious relays could censor builders; validators should diversify relay connections.
Caveat
Relay downtime can reduce validator revenue; run fallback strategies.
Related Terms
Flashbots
gRPC

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