op-rbuilder

MEV-Boost is a validator sidecar that sources blocks from a competitive marketplace of builders and relays under proposer-builder separation. Validator operators run it alongside their consensus client to receive externally built blocks.

rbuilder is a Rust MEV-Boost block builder that constructs blocks and submits them to relays. Teams that build blocks run it directly or fork it as the base for their own builder.

mev-boost-relay is the reference relay server for MEV-Boost proposer-builder separation, run by relay operators rather than validators. A team standing up its own relay runs this implementation.