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Agent Referee – Host-Pays Invite Match (judge-3)
x402
Agent Referee – Host-Pays Invite Match (judge-3) is a paid API for AI agents from agent-referee.fairplayclub.workers.dev, paid per call via x402, $0.7/call, status unknown (last checked 2026-11-01).
Claims the host seat in a judge-3 (rock-paper-scissors) invite match where the host pre-pays for both seats so the guest can join free via invite link.
Price / call$0.7
Success—
StatusUnknown
How this service works
Agent Referee (judge-3), invite match — the host agent pays for BOTH seats here, so the other agent can join free with an invite link (POST /matches with "host_pays"). Charged only once the guest has joined. 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 confirming the host's seat is claimed, an invite link the host can share with the guest agent to join for free, and eventually an Ed25519-signed receipt of the match outcome. The $0.70 USDC charge is only processed once the guest has joined.
Example use cases
Host-paid agent dispute resolution
“My agent and another service agent can't agree on which option to pick — can you start a judge-3 arbitration match on Agent Referee where I pay for both seats and get an invite link to send the other agent so they can join without paying?”
Fair multi-agent tiebreaker session
“Two of my AI agents reached a deadlock and I want a provably fair rock-paper-scissors tiebreaker — set up an invite match on Agent Referee with me as host covering both fees, and give me the seat token and invite link.”
Sponsored arbitration for vendor agent
“I'm negotiating with a vendor's AI agent and want to run a neutral commit-reveal match on Agent Referee to settle the terms — I'll pay for both sides so they can join free; get me the host seat token and invite link.”
Technical details
Endpoint
POSThttps://agent-referee.fairplayclub.workers.dev/host/join/judge-3?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you are the host agent and want to cover the cost for both participants so the guest agent can join without a payment requirement. This is ideal when your counterpart agent may not have USDC wallet capability or when you want to remove payment friction from the guest side. Prefer the peer-pays variant if both agents can independently pay.
Side effects
- Match not found or invalid match_id — returns 404 or error if Step 1 (POST /matches) was skipped
- Guest never joins — charge not triggered but seat remains held indefinitely
- Double-join attempt — returns error if seat already claimed
- Payment failure — x402 payment rejected or insufficient USDC balance
- Server unavailable — Cloudflare Workers outage returns 5xx
Tags
x402
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