MEV Watch 2026: Tracking Censorship and Relay Neutrality

What MEV Watch tracks today

MEV Watch functions as a transparency layer for the Ethereum MEV-Boost ecosystem, specifically designed to monitor relay behavior and block inclusion patterns. By aggregating data from the relay network, it provides a public ledger of which validators are including or excluding transactions, offering a clear view into the censorship landscape of block production.

The platform focuses on two primary metrics: block share and censorship rates. Block share measures the proportion of blocks a relay contributes to the chain, indicating its market influence. Censorship metrics track the frequency with which a relay refuses to include specific transactions, often flagged by the presence of contract addresses associated with known censoring entities. This distinction allows researchers and validators to differentiate between neutral relays and those enforcing selective inclusion policies.

Understanding these metrics is critical for maintaining network neutrality. As Maximal Extractable Value (MEV) continues to evolve, the risk of centralized censorship grows. MEV Watch provides the data necessary to identify these patterns early, enabling the community to hold relays accountable and ensure that the MEV-Boost flow remains diverse and resistant to single-point failures.

Neutral relays versus compliant relays

The central tension in Ethereum’s block production landscape is the distinction between neutral and compliant relays. MEV Watch tracks this divide by monitoring how MEV-Boost relays handle transaction inclusion. A relay is classified as "compliant" if it filters transactions based on OFAC sanctions lists, effectively censoring addresses associated with illicit activity. Conversely, a "neutral" relay processes all valid transactions regardless of the sender’s identity, adhering to a strict censorship-resistant model.

This distinction matters because it determines who controls the narrative of the blockchain. Compliant relays act as gatekeepers, enforcing real-world legal frameworks on a decentralized network. Neutral relays prioritize protocol neutrality, ensuring that no single entity can block transactions based on political or regulatory preferences. The rise of compliant relays has sparked debate over whether Ethereum is becoming a permissioned ledger in practice, even if it remains permissionless in theory.

Comparison of relay models

The following table compares the operational characteristics of neutral and compliant relays based on MEV Watch data and protocol behavior.

Market impact and neutrality

The shift toward compliant relays has tangible effects on network dynamics. As more block space flows through OFAC-filtering relays, the effective censorship rate of the network increases. MEV Watch data shows that compliant relay share has fluctuated significantly, sometimes exceeding 50% of all MEV-Boost blocks. This concentration of power raises concerns about centralization and the potential for regulatory overreach.

To understand the broader market context, it is useful to look at Ethereum’s current performance, which often influences relay behavior and profitability.

The debate over relay neutrality is not just technical; it is philosophical. Neutral relays argue that censorship resistance is a core value of Ethereum, while compliant relays contend that they are protecting the ecosystem from abuse. MEV Watch provides the transparency needed to monitor this balance, allowing users and validators to make informed choices about which relays to trust.

Choosing a relay strategy

For validators and users, the choice between neutral and compliant relays depends on their risk tolerance and values. Validators may prioritize compliance to avoid regulatory scrutiny, while users seeking maximum censorship resistance may prefer neutral relays. MEV Watch’s data enables this decision by providing real-time insights into relay behavior and block production trends.

Ultimately, the health of Ethereum’s ecosystem depends on maintaining a balance between neutrality and compliance. Too much compliance risks turning Ethereum into a controlled network, while too little may expose it to illicit activity. MEV Watch serves as a critical tool in navigating this complex landscape, ensuring that the truth about relay behavior remains visible to all.

Censorship trends in 2026

The landscape of maximum extractable value (MEV) on Ethereum is undergoing a quiet but significant correction. For years, the dominance of OFAC-compliant relays in MEV-Boost auctions served as a primary indicator of censorship pressure. However, 2026 data reveals a decisive shift toward a more neutral network structure, driven by relay diversification and user preference for uncensored execution environments.

According to transparency data from MEV Watch, the share of blocks produced by OFAC-compliant relays has fallen below the 50% threshold. This drop marks a critical inflection point, signaling that censoring relays no longer control the majority of block production. The decline suggests that builders and validators are increasingly prioritizing transaction inclusion over regulatory compliance in the relay selection process.

This trend is not isolated to a single protocol or era. As more relays enter the MEV-Boost ecosystem without strict sanction filters, the competitive pressure on compliant relays increases. Users and builders are demonstrating a clear preference for open markets where transaction censorship is minimized. The result is a more resilient MEV infrastructure that better aligns with the decentralized ethos of Ethereum.

The implications for the broader crypto economy are substantial. A neutral MEV landscape reduces the risk of selective transaction blocking and promotes fairer access to blockchain services. As censorship declines, the focus shifts from regulatory compliance to efficiency and innovation, allowing the MEV market to mature into a more transparent and competitive space.

Complementary monitoring tools

MEV Watch provides a high-level view of censorship events, but a complete security posture requires specialized trackers that focus on the relay layer and user-facing transaction protection. Relying on a single data source leaves blind spots in how block builders and relays interact with your specific transaction flow.

MEV-Boost relay monitoring

MEV-Boost is the standard middleware connecting Ethereum validators to external block builders. While it increases revenue for validators, it also introduces points of potential censorship or exclusion. The official MEV-Boost tracker allows operators to monitor the health and behavior of individual relays in real time. By observing which relays are consistently dropping transactions or failing to deliver blocks, validators and users can identify neutral versus biased infrastructure.

This tool is essential for verifying that the MEV supply chain remains open. If a majority of top-performing relays begin exhibiting similar exclusion patterns, it signals a coordinated restriction on transaction inclusion. Tracking these metrics helps distinguish between isolated technical failures and systemic censorship events.

User-level protection with MEV Blocker

For end-users, the risk of MEV manifests as frontrunning and sandwich attacks that drain capital from trades. MEV Blocker offers a free RPC endpoint designed to protect these transactions by filtering out malicious bundles before they reach the mempool. Unlike network-level monitoring, this tool provides direct, everyday protection for individual users on a wide range of Ethereum transactions.

Integrating MEV Blocker into your wallet or dApp interaction ensures that your trades are executed without predatory front-running. It complements MEV Watch by addressing the micro-level impact of MEV on individual accounts, while MEV Watch tracks the macro-level health of the consensus layer.

Building a layered defense

Combining these tools creates a robust defense strategy. MEV Watch alerts you to broad censorship trends, MEV-Boost trackers help you select neutral relays, and MEV Blocker shields your specific transactions from exploitation. This multi-layered approach ensures that you are not only aware of the state of the network but also actively protected against its worst abuses.

Frequently asked questions about MEV Watch

What does MEV stand for?

Maximal Extractable Value (MEV) refers to the maximum amount of value a blockchain miner or validator can make by including, excluding, or changing the order of transactions within a block. It is not a fee paid by users, but rather value extracted from the ordering of transactions. For more details, see the Ethereum.org MEV documentation.

Is MEV good or bad?

MEV is neither inherently good nor bad; it is a feature of decentralized systems that creates complex incentives. On one hand, it rewards validators for securing the network and can provide arbitrage opportunities that keep prices aligned across exchanges. On the other hand, it can lead to censorship, front-running, and increased transaction costs for ordinary users. The net effect depends on how the ecosystem manages these incentives.

What are the risks of MEV?

The primary risks of MEV include transaction censorship, where validators refuse to include specific transactions, and front-running, where bots exploit knowledge of pending trades. This can lead to a "race to the bottom" in validator neutrality and potentially centralize block production among those with the most sophisticated MEV extraction tools. These risks undermine the trustlessness and fairness of the blockchain.

How does MEV-Boost work?

MEV-Boost is a middleware solution that separates the block builder role from the validator role. Validators send their block-building rights to a relay network, which aggregates bids from multiple block builders. The validator then chooses the block with the highest bid. This process democratizes MEV rewards, prevents validators from censoring transactions for personal gain, and ensures that users get the best possible execution price without needing to manage complex MEV strategies themselves.

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