# flashbots/mev-boost

MEV-Boost allows Ethereum validators to source high-MEV blocks from a competitive builder marketplace

Repository: https://github.com/flashbots/mev-boost
Canonical: https://ross.abutalabs.com/products/mev-boost
Homepage: https://boost.flashbots.net
Language: Go
License: MIT
License Family: permissive
Topics: ethereum, mev, mev-boost
Last push: 2026-06-30T14:02:06+00:00

## Health v2 (maintenance only)
Score: 82/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 90, release rhythm 60, longevity 100
- inputs: {"age_days": 1750, "days_push": 64, "days_rel": 191, "gap_med": 50.5, "n_releases_24m": 5}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1437, forks 290 (observed 2026-08-28T04:04:43.693240+00:00)

## What it is
MEV-Boost is open-source middleware (a sidecar) for Ethereum proof-of-stake validators that connects consensus clients to a competitive marketplace of external block builders via relays. It implements proposer-builder separation (PBS), letting validators source high-MEV blocks and increase staking rewards.

## Use cases
- increase ethereum validator staking rewards by selling blockspace to builders
- run mev-boost sidecar alongside a beacon node
- connect a consensus client to multiple block-building relays
- implement proposer-builder separation for a pos ethereum node
- source high-mev blocks for block proposals
- configure relays for mainnet or testnet validator setups

## When to choose
- you operate an ethereum pos validator or node and want to maximize block proposal revenue
- you want a client-agnostic sidecar compatible with any consensus client via the Builder API
- you need to connect to multiple relays for competitive block sourcing

## When to avoid
- you run a non-Ethereum blockchain or proof-of-work setup
- you want to avoid trusting external relays and builders and prefer building blocks locally
- you need a full validator or execution client - mev-boost is only a sidecar

## Facets
- artifact type: service
- maturity: active
- function: middleware, api-framework, http-server, blockchain
- domain: blockchain, infrastructure-as-code, developer-tools
- platform: go, self-hosted
- tags: ethereum, mev, pos, validator, pbs, block-builder, relay, sidecar, staking, cryptocurrency, linux, macos, docker

## Member repositories
- flashbots/mev-boost (main) score 82

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:43.693240+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:36:44.013079+00:00, confidence not recorded.
  - readme: https://github.com/flashbots/mev-boost (fetched 2026-08-28T04:04:43.693240+00:00, sha 3b24d8bfa0cd)
  - homepage: https://boost.flashbots.net (fetched 2026-08-29T11:47:29.988749+00:00, sha f29365a8ea8f)
  - site_page: https://boost.flashbots.net/mev-boost-status-updates/mev-boost-documentation-is-live (fetched 2026-08-29T11:47:29.992068+00:00, sha 3330f82e986f)
  - site_page: https://docs.flashbots.net/flashbots-mev-boost/introduction (fetched 2026-08-29T11:47:29.999094+00:00, sha b2dd8b53dcf2)
- Data as of 2026-08-30T08:39:29.467469+00:00.