What is MEV Watch?
MEV Watch is a transparency tool that tracks how Ethereum MEV-Boost relays handle transactions. It visualizes the flow of blocks through different relays, specifically flagging which ones censor transactions based on OFAC compliance or other criteria. Think of it as a public ledger for relay behavior, allowing node operators and builders to see who is filtering out specific users or transactions.
The platform provides daily metrics and relay leaderboards, helping the community identify which relays are compliant with sanctions and which are more permissive. This visibility is critical for understanding the current state of MEV extraction and censorship resistance in the Ethereum ecosystem.
Should I enable MEV protection?
MEV protection is designed to be safer than submitting regular onchain transactions by providing safeguards against different MEV strategies. While the system substantially lowers the risk of negative outcomes associated with MEV, no system can eliminate risks entirely. For most users, enabling MEV protection is a prudent step to avoid front-running and sandwich attacks, especially when interacting with high-traffic DeFi protocols.
What is MEV?
Maximal Extractable Value (MEV), also called Miner Extractable Value, refers to strategies that can be employed to profit from the process of rearranging, including, or omitting specific transactions from a block. In the context of Ethereum, this value is extracted by validators or builders who have the power to order transactions.
Mev watch choices that change the plan
MEV-Boost relays sit between validators and block builders, but they are not created equal. Some prioritize throughput and transaction inclusion, while others enforce strict censorship filters, such as OFAC compliance. MEV Watch tracks these behaviors by monitoring which relays submit blocks and which transactions are dropped or reordered.
Choosing a relay configuration involves balancing speed, cost, and regulatory risk. Validators must decide whether to maximize rewards through competitive relays or prioritize compliance to avoid regulatory scrutiny. Users sending transactions face similar tradeoffs: faster inclusion might mean higher fees or exposure to censoring relays.
The following table breaks down the primary tradeoffs across different relay strategies and their impact on validators and users.
| Factor | Competitive Relays | Censoring Relays | Mixed/Custom |
|---|---|---|---|
| Transaction Inclusion | High (fewer drops) | Low (OFAC drops) | Variable |
| Validator Rewards | Highest | Medium | Medium-High |
| Regulatory Risk | Low | High (compliant) | Medium |
| User Privacy | Low | Low (filtered) | Variable |
| Latency | Low | Low | Medium |
Competitive relays
Competitive relays focus on maximizing block value and transaction inclusion. They accept transactions from any source, including those on OFAC-sanctioned addresses. For validators, this means the highest potential block rewards. For users, it means faster inclusion but no protection from censorship or regulatory flags. This is the default setting for most high-performance validators.
Censoring relays
Censoring relays, often compliant with OFAC guidelines, drop transactions from sanctioned addresses. This reduces the total block value and can lower validator rewards. However, it provides a layer of regulatory compliance for validators operating in jurisdictions with strict financial laws. Users interacting with sanctioned addresses will experience failed transactions or delays.
Mixed or custom configurations
Some validators use mixed strategies, connecting to multiple relays or custom configurations. This allows them to balance rewards and risk, though it adds complexity. MEV Watch data shows that a significant portion of blocks are built by relays that blend these approaches. This option requires active monitoring and adjustment to remain optimal.
"MEV Watch is a focused blockchain monitoring tool designed to visualize and report how Ethereum blocks are being produced with respect to OFAC compliance."
— QuickNode Builders Guide
Decision framework
Your choice depends on your priority. If maximizing rewards is key, use competitive relays. If regulatory compliance is non-negotiable, use censoring relays. For most validators, a mixed strategy with MEV Watch monitoring offers the best balance. Always verify relay behavior, as policies can change rapidly.
Choose the next step in the MEV landscape
With MEV-Boost updates tightening relay standards and regulators watching closely, you must decide how your node handles transaction ordering. The choice is no longer just technical; it is a compliance and revenue decision.
1. Assess your regulatory exposure
If you operate in jurisdictions with strict financial laws, default to OFAC-compliant relays. This filters transactions linked to sanctioned entities, reducing legal risk. However, this comes at the cost of lower potential revenue, as compliant relays often exclude high-value arbitrage opportunities.
2. Evaluate censorship resistance needs
For users prioritizing neutrality, select non-censoring relays. These allow a broader range of transactions, including those that might be blocked by compliance filters. While this maximizes potential block rewards, it exposes you to higher scrutiny and potential regulatory backlash if your node processes illicit funds.
3. Implement real-time monitoring
Regardless of your choice, monitor relay behavior using tools like MEV Watch. This transparency tool tracks censoring and non-censoring relay flows, allowing you to detect sudden shifts in relay behavior or compliance enforcement. Staying informed helps you pivot quickly if a relay becomes too restrictive or too risky.
4. Balance revenue with risk
Consider a hybrid approach: split your traffic between compliant and non-compliant relays. This strategy captures some high-value MEV while maintaining a baseline of regulatory safety. Adjust the split based on market conditions and your specific risk tolerance.
5. Review and adjust regularly
The MEV landscape changes rapidly. Regularly review your relay selections and monitor metrics to ensure your configuration aligns with current regulations and market opportunities. What works today may be illegal or unprofitable tomorrow.
Spotting Weak Options in the 2026 MEV Landscape
New MEV-Boost updates and regulatory scrutiny have created a fragmented environment where "censorship-resistant" claims often mask compliance filters. Many builders assume MEV protection is a silver bullet, but as MetaMask notes, these safeguards only lower risk—they do not eliminate it entirely. You must verify which transactions are actually being filtered.
MEV Watch by Labrys provides essential transparency into this opacity. It tracks relay flows and identifies which relays censor transactions based on OFAC compliance or other criteria. Without monitoring tools like this, you might unknowingly route through relays that silently drop your transactions, creating a false sense of security.
The primary keyword cluster here is MEV protection and MEV-Boost updates. When evaluating options, look for concrete data on relay behavior rather than marketing promises. If a relay does not publish its censoring policies or share data with transparency tools, it is a weak option. Regulatory scrutiny is increasing, so relying on opaque infrastructure is a significant liability.
Decision Guide
Choose relays that publish their censoring policies and integrate with monitoring tools. Avoid those that offer vague guarantees of "MEV protection" without technical specifics. The landscape is shifting toward compliance, so your choice of builder directly impacts your transaction success rate and regulatory risk.
Mev watch: what to check next
Maximal extractable value (MEV) is the extra profit a block producer can make by reordering, including, or excluding transactions from a block [src-6]. While often called "miner extractable value" in banking contexts, on crypto it refers to validators in proof-of-stake systems like Ethereum [src-3].
MEV Watch tracks how relays and builders handle these transactions, highlighting censorship risks and compliance with regulations like OFAC [src-1]. Since the transition to proof-of-stake, roughly 25% of Ethereum blocks have been built by relays with known censorship histories [src-4].
Enabling MEV protection, such as through MEV-Boost, is generally safer than submitting transactions directly to the mempool. It adds safeguards against front-running and sandwich attacks, though it cannot eliminate all risks entirely [src-serp-1].
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