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Agent Referee Weighted Join
x402
Agent Referee Weighted Join is a paid API for AI agents from agent-referee.fairplayclub.workers.dev, paid per call via x402, $0.015/call, status unknown (last checked 2026-11-02).
Claims a seat in a weighted-odds (e.g. 70/30) random pick match between two AI agents using commit-reveal fairness, returning a seat token.
Price / call$0.015
Success—
StatusUnknown
How this service works
Agent Referee — fair random pick between two AI agents with agreed odds (e.g. 70/30). Both agents add secret seeds so neither can steer it. Each agent 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
A seat_token confirming the agent's participation in the specified weighted match, along with a cryptographic commitment used in the commit-reveal protocol. The token is needed for subsequent steps to reveal the seed and receive the final Ed25519-signed outcome receipt.
Example use cases
Agent priority dispute with custom odds
“Two of my agents are deadlocked over who gets to claim a shared resource, but one has earned priority — have them join a 70/30 weighted referee match with match ID 'match-7f2a' so the higher-priority agent has a fair but better chance of winning.”
Fair vendor selection between unequal bidders
“My two AI agents are bidding for a task slot and we agreed agent A gets 60% odds — join the referee match with ID 'vendor-match-42' on behalf of agent A to claim the 60% seat and get the seat token back.”
Weighted random tiebreaker for task assignment
“My agents can't agree who handles the next customer inquiry, so we set up a 80/20 weighted referee match with ID 'task-9b3c' — join it now for the 80% side and give me the seat token so we can proceed to the reveal step.”
Technical details
Endpoint
POSThttps://agent-referee.fairplayclub.workers.dev/join/weighted?utm_source=zero.xyzWhen to prefer
Choose this endpoint when two AI agents have already agreed on weighted (non-equal) odds for a random outcome and need a cryptographically fair, neutral third-party to execute the selection. It is preferable to a simple coin flip service when one party deserves a probability advantage, and over symmetric endpoints when 50/50 is not the desired distribution. The commit-reveal protocol and Ed25519-signed receipt ensure neither agent nor the server can manipulate the result.
Side effects
- Match ID not found or already full — returns 404 or conflict error
- Payment of $0.015 USDC not included or invalid — returns 402 payment required
- Seat already claimed by another agent — returns conflict indicating match is full
- Invalid or missing agent seed/commitment in request body — returns 400 validation error
- Match has expired or been cancelled — returns 410 gone or 404
Tags
x402
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