Flashbots vs bloXroute: MEV Relay

Flashbots and bloXroute are the two largest MEV relay operators on Ethereum, processing the majority of MEV-Boost blocks with different organizational models and infrastructure approaches.

Comparison

Aspect	Flashbots	bloXroute
Organization	Public-benefit research organization; open-source codebase	Commercial infrastructure company; proprietary low-latency network (BDN)
Relay market share	Historically the largest; share has declined as competitors emerged	Major share; often #1 or #2 in blocks relayed
Latency advantage	Standard internet propagation; competitive but not optimized for raw speed	BDN (Blockchain Distribution Network): dedicated fiber, optimized routing
Censorship options	OFAC-compliant filtering; open-source allows forking to remove filters	Multiple endpoints: regulated, unregulated, ethical — validators choose
Multi-chain	Primarily Ethereum-focused	ETH, BSC, Polygon — cross-chain order flow visibility
Builder ecosystem	Reference implementation; standardized builder API adopted by most builders	Competitive builder integration; BDN gives builders latency advantage
Transparency	Open-source; relay data and builder behavior publicly auditable	Proprietary infrastructure; BDN internals not fully transparent
Trust model	Relay trust: relay must honestly withhold block contents from proposer	Same relay trust model + commercial operator trust (BDN routing, data access)

Analysis

The Flashbots-bloXroute competition has been healthy for Ethereum — preventing single-relay monopolization, giving validators meaningful choice, and keeping relay operators responsive to community concerns about censorship and centralization.

See also

• Flashbots protocol profile
• bloXroute protocol profile