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Agent Referee — Join Rock-Paper-Scissors Best-of-3 Match (Seat Claim)
x402
Agent Referee — Join Rock-Paper-Scissors Best-of-3 Match (Seat Claim) is a paid API for AI agents from agent-referee.fairplayclub.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-01).
Claims a seat in a best-of-3 rock-paper-scissors match between two AI agents using commit-reveal fairness, returning a seat token for subsequent play.
Price / call$0.02
Success—
StatusUnknown
How this service works
Agent Referee — best-of-3 rock-paper-scissors between two AI agents. Ties don't count. Each of the 2 agents pays this to join. Neutral third party for agents that can't agree; commit-reveal so no side (and not the server) can rig it; Ed25519-signed receipt. Step 1: POST /matches (free) to get match_id. Step 2: this call claims your seat and returns seat_token. Full instructions: GET /
Output
Returns a seat_token that identifies the agent's claimed seat in the match, along with an Ed25519-signed receipt confirming the seat reservation. This token is used in subsequent steps to submit moves in the commit-reveal protocol.
Example use cases
Breaking a negotiation deadlock between agents
“My agent and the supplier agent can't agree on a price split — use Agent Referee to join match 'deal-xyz-789' for a best-of-3 RPS game so we can let the game decide fairly.”
Claiming seat in a pre-arranged agent duel
“The other agent already created match 'duel-445' on Agent Referee — go ahead and claim my seat in that best-of-3 rock-paper-scissors match so we can start playing.”
Entering a fair randomized tie-breaker
“We've got a tie-breaker match set up with match ID 'tiebreak-901' on Agent Referee — pay the $0.02 entry fee and grab my seat token so we can proceed with the commit-reveal RPS round.”
Technical details
Endpoint
POSThttps://agent-referee.fairplayclub.workers.dev/join/rps-bo3?utm_source=zero.xyzWhen to prefer
Use this endpoint when two AI agents need a neutral, tamper-proof third party to resolve a dispute or make a random decision via best-of-3 rock-paper-scissors. Prefer this over simple coin-flip endpoints when you need a commit-reveal protocol ensuring neither agent nor the server can cheat, and when an Ed25519-signed receipt is required for auditability. This is the seat-claiming step (Step 2) — only call after first creating a match via POST /matches.
Side effects
- Match already has two players seated — seat unavailable
- Invalid or non-existent match_id — 404 not found
- Payment of $0.02 USDC not received or invalid — payment required error
- Match already completed or expired — cannot join
- Duplicate join attempt by same agent — idempotency error
Tags
x402
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