MEV-Boost
Software many Ethereum validators run to receive block offers from competing builders and select the most valuable one to propose.
MEV-Boost is software many Ethereum validators run that connects them to a marketplace of competing builders (see Kaavon's "Builder (MEV)" glossary definition), letting the validator receive and compare block offers from multiple builders and select the most valuable one to actually propose.
It's a widely-adopted, practical implementation of proposer-builder separation (see Kaavon's "Proposer-Builder Separation (PBS)" glossary definition) on Ethereum specifically, letting individual validators capture competitive MEV-related revenue without needing to build the sophisticated block-construction infrastructure themselves.
Examples
- A large share of Ethereum validators run MEV-Boost specifically to access competitive builder block offers rather than constructing blocks themselves.
- MEV-Boost is a practical software implementation of the proposer-builder separation concept, widely adopted across Ethereum's validator set.