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Fast Protocol is designed so that opting in is rational and strictly profitable for validators. This page explains the incentive model and what validators gain.

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What Opted-In Validators Earn

Validator TypeApprox. mev CaptureReason
Opted-In~95% of FAST RPC mevFull backrun mev + residual
Not Opted-In~5% of FAST RPC mevSimilar to mev Blocker
Opted-in validators enjoy approximately 20x higher mev capture on FAST RPC flows compared to non-opted-in validators.

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Where the Value Comes From

Opted-in validators gain from three sources:
  1. Backrun-captured mev from FAST RPC bundles routed to their blocks
  2. Their share of traditional builder-to-validator mev (unaffected by opting in)
  3. Competitive advantage in attracting order flow — searchers and builders prefer blocks where their bundles will be honored

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When Is Opting In Profitable?

Opting in is designed to be strictly profitable for validators. In future protocol versions, opted-in validators may pay a dynamic fee taken from the producer reward of their opt-in blocks. This fee is bounded so that it never exceeds the additional value an opted-in validator receives from mev-commit — opting in remains net-positive by design. No fee is taken today.

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How to Opt In

Validators can opt in through the mev-commit protocol. See the Validator Guide for setup instructions, or register via EigenLayer or Symbiotic for restaking-based opt-in.