MEV Watch 2026: Tracking AI Arbitrage and Relay Censorship

What MEV Watch tracks today

MEV Watch operates as a transparency layer for the Ethereum MEV-boost ecosystem. It monitors the flow of transactions through relays, providing daily metrics on which nodes censor blocks and which do not. The tool shifts focus from simple profit extraction to the detection of censorship, offering a clear view of relay behavior.

The platform tracks censoring and non-censoring relay flow, allowing users to see the distribution of block production across different relays. By highlighting which relays are excluding specific transactions, MEV Watch helps identify patterns of censorship that might otherwise go unnoticed. This data is crucial for understanding the current state of MEV extraction and its impact on network integrity.

For a deeper look at the mechanics, the official MEV Watch site provides detailed leaderboards and historical data. These resources allow validators and users to assess the reliability and censorship resistance of various relays. The goal is to promote a more transparent and fair MEV landscape by making relay performance visible to all participants.

AI arbitrage changes the profit math

The introduction of AI-driven searchers has fundamentally altered the profit equation for block space. Traditional arbitrage bots, which relied on static code and predictable patterns, are now competing against dynamic models that continuously adapt to market microstructure. This shift is squeezing margins for legacy strategies, forcing a recalibration of how value is extracted from the blockchain.

AI searchers optimize block space usage by predicting transaction flows with greater precision than rule-based systems. They can identify subtle inefficiencies in liquidity pools and reorder transactions to maximize extraction, often at the expense of human traders and older bots. This increased efficiency for the searcher translates directly into higher costs and lower returns for everyone else, turning arbitrage into a high-stakes arms race.

The competition for block space has intensified, driving up the cost of inclusion. As AI models become more sophisticated, the window of opportunity for profitable trades narrows significantly. Searchers must execute faster and more accurately, relying on low-latency infrastructure and advanced machine learning models to stay ahead. This dynamic creates a barrier to entry that favors well-resourced teams with access to cutting-edge technology.

For traditional arbitrage bots, the result is a decline in profitability. Strategies that once generated consistent alpha are now yielding diminishing returns as AI searchers capture a larger share of the available value. This trend is likely to persist as AI capabilities continue to advance, making it increasingly difficult for non-AI bots to compete on a level playing field.

Neutral relays vs. censoring relays

Ethereum validators route their blocks through MEV-Boost relays, which act as intermediaries between block builders and validators. These relays fall into two distinct categories: neutral relays, which prioritize the highest bid, and censoring relays, which may exclude transactions based on specific criteria. Understanding the difference is essential for evaluating the health of the MEV supply chain.

Neutral relays operate on a pure meritocracy. They accept any transaction payload that offers the highest effective tip, regardless of the sender or content. This model maximizes validator revenue and maintains the permissionless nature of the network. However, it also means that any transaction, including those that might be considered malicious or controversial, can be included if the bid is high enough.

Censoring relays, by contrast, maintain blocklists. They filter out transactions from addresses associated with sanctioned entities, hack exploits, or other undesirable activities. While this introduces a layer of compliance and potentially protects users from certain risks, it also centralizes power. Validators who rely on these relays may inadvertently support a system where transaction inclusion is not guaranteed by market forces but by policy decisions.

The trade-off is clear: neutral relays offer maximum revenue and decentralization, while censoring relays offer compliance and risk mitigation. The choice often depends on the validator's risk tolerance and regulatory environment.

Data from MEV Watch provides real-time insights into how these relays are performing. The platform tracks the share of blocks produced by each type, offering a transparent view of the network's current state. For validators, this data is critical for making informed decisions about which relays to connect to.

Choosing the right relay for your strategy

Selecting an MEV-boost relay is no longer just about finding the highest bid. It is a risk management decision that balances potential revenue against the threat of censorship. Your choice depends entirely on whether you prioritize consistent block production or maximum extractable value, regardless of the cost.

For Validators: Stability Over Yield

Validators should treat relays like liquidity providers. If a relay censors transactions to protect its own searchers, you miss out on MEV opportunities. However, if you route exclusively to aggressive, high-yield relays, you risk being censored by the network itself if those relays are flagged for anti-competitive behavior.

The safest path is diversification. Route a significant portion of your traffic to well-established, transparent relays that publish their censorship policies. Use tools like MEV Watch to monitor real-time censorship rates. A relay that censors 10% of blocks might offer higher average bids, but the variance can destabilize your validator’s performance.

For Searchers: Latency and Reliability

Searchers face the opposite problem. You need relays that prioritize speed and inclusion over strict compliance. If a relay is overly cautious, your profitable arbitrage opportunities may be filtered out before they reach the block builder.

Look for relays with low latency and high inclusion rates for complex bundles. However, be aware that "censorship-resistant" relays may have lower bids because they exclude high-value but controversial transactions. The trade-off is clear: higher inclusion probability often means lower average payouts.

The Decision Matrix

Use this comparison to align your relay choice with your specific operational goals. There is no single best relay; there is only the best fit for your current risk tolerance.

Ultimately, the right relay for your strategy is one that aligns with your ethical standards and technical requirements. Regularly review your performance and adjust your routing as the MEV landscape evolves. Staying informed through official channels and real-time data is your best defense against unexpected losses.

Common MEV questions answered