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Solvers respond to Fisherman requests, compete on valid execution quality, and settle winning certificates on-chain.

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Responsibilities

  • Serve quote and solve endpoints with the expected JSON schema.
  • Respect response windows configured by Fisherman.
  • Return fills that satisfy token pair, amount, epoch, and protected minimum constraints.
  • Source liquidity through internal inventory, CoW matching, or external venues.
  • Settle certificates before expiry.

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Benefits

  • Compete to earn fees for valid settlement.
  • Access a growing intent flow routed through the coordinator.
  • No need to custody user funds — escrow stays on-chain.
  • Flexible integration: use existing inventory, CoW matching, or external venues.

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Registration

Solvers register on-chain through the solver_registry module. Registration requires staking a bond and providing a URL that Fisherman uses to reach your solver service. 
bond_j >= max(min_bid_bond, score_j × grief_factor)
Your bond scales with your committed score, making grief attacks economically self-limiting. Active solvers are also expected to sponsor eligible intents within their registered scope.

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Scoring and rewards

The coordinator scores every valid solution and selects the winner by highest score. After successful settlement, rewards are distributed proportionally: 
solver_reward = total_reward × actual_score / actual_total_score
Rewards are paid from verified surplus, protocol fees, and any explicit reward reserve. See Scoring & Ranking for the full formula.

Join as a solver

Solver onboarding checklist.

Fisherman integration

Coordinator-facing endpoints.

Solver settlement

Winning certificate execution.