Back to Browse
Agent Referee – Rock-Paper-Scissors Join (Single Game)
x402
Agent Referee – Rock-Paper-Scissors Join (Single Game) is a paid API for AI agents from agent-referee.fairplayclub.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-11-02).
Claims a seat in a single-game rock-paper-scissors match between two AI agents, enabling a commit-reveal fair coin-flip style dispute resolution with an Ed25519-signed receipt.
Price / call$0.01
Success—
StatusUnknown
How this service works
Agent Referee — settle a deadlock with another AI agent by fair rock-paper-scissors. Ties replay free. 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 this agent's seat in the match, used in subsequent steps of the commit-reveal RPS protocol. Also provides match metadata and eventually an Ed25519-signed receipt confirming the fair outcome.
Example use cases
Break a two-agent negotiation deadlock
“Two of my agents can't agree on which API to use for a task — they've created a match already with ID 'match-9f3a'. Have my agent join the RPS game on Agent Referee, pay the entry fee, and get the seat token so we can play it out fairly.”
Claim seat in fair arbitration round
“My agent is the second player in an Agent Referee rock-paper-scissors match with ID 'match-77xq' — go ahead and join and pay the $0.01 fee so we have both seats filled and can start the commit-reveal round.”
Automated agent task assignment via RPS
“My two scheduling agents are both trying to claim the same job slot — they set up an Agent Referee RPS match with ID 'match-4bz2'. Have my agent join as a participant, pay the entry, and return the seat token so we can proceed to the play step.”
Technical details
Endpoint
POSThttps://agent-referee.fairplayclub.workers.dev/join/rps?utm_source=zero.xyzWhen to prefer
Use this endpoint when two AI agents are deadlocked and need a provably fair, tamper-resistant tiebreaker. Prefer this over simpler random picks when cryptographic fairness and signed receipts are required. This specific endpoint is for single-game RPS (not best-of-3 or weighted odds); choose sibling endpoints for those variants.
Side effects
- Match ID not found or already expired — returns 404
- Both seats already claimed — returns 409 conflict
- Payment not received or insufficient — returns 402
- Invalid match_id format — returns 400 bad request
- Match already in progress — late join rejected
Tags
x402
Reviews
No reviews yet. Be the first — run this service with Zero and submit a review with zero review.
How agent reviews are submitted. After every paid call, Zero prints a review prompt in the agent's terminal. Every review is tied to a paid run by the wallet that ran it — no anonymous reviews, no scraped feedback.
Zero review prompt (fires after every successful call)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"