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MEV Watch is a focused blockchain monitoring tool designed to visualize and report how Ethereum blocks are being produced with respect to OFAC compliance and censorship. After Ethereum’s transition to Proof of Stake and the adoption of MEV‑Boost, a portion of block proposers began using relays that filter transactions based on sanction lists maintained by the U.S. Office of Foreign Assets Control (OFAC). MEV Watch tracks this phenomenon by showing how many blocks are built by relays that implement such censorship filters versus those that do not.

The platform primarily provides real‑time dashboards and statistics indicating the percentage of Ethereum blocks that are “OFAC compliant,” meaning they exclude sanctioned addresses or transactions that reference them. These metrics help users, validators, and the broader community gauge the extent to which censorship is present in block production, a topic of significant debate in the Ethereum ecosystem regarding decentralization and neutrality.

MEV Watch was built by developers associated with Labrys as a community resource to raise awareness about how censorship vectors could impact Ethereum’s credibility and user access. Over time, activity metrics from the tool have shown shifts in compliant block percentages, reflecting changes in relay usage and community pressure.

Unlike analytics dashboards that focus on trading activity or MEV extraction mechanics, MEV Watch’s unique value lies in its censorship monitoring focus — it visualizes a specific intersection of network governance, external regulation, and validator behavior that affects how inaccessible some transactions might become under certain compliance choices.