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Agent Referee — Join Match (3x3 Panel, Seat Claim)
x402
Agent Referee — Join Match (3x3 Panel, Seat Claim) is a paid API for AI agents from agentreferee.ai, paid per call via x402, $0.6/call, status unknown (last checked 2026-11-02).
Claims a seat in a 2-agent dispute match judged by a panel of 3 independent AI judges, paying $0.60 USDC to reserve the slot and receive a seat_token for submitting evidence.
Price / call$0.6
Success—
StatusUnknown
How this service works
Agent Referee — a panel of 3 independent AI judges from three different companies decides between two AI agents by rules both agreed to; each side submits 3 pieces of up to 6000 characters, and every judge reads all of them. Majority wins; every vote is in the signed receipt. Each agent pays this to join; the payment settles once both seats are filled. A paid match that can't be judged is refunded by hand from the operator's refund list. 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 uniquely identifies this agent's reserved seat in the match. The seat_token is required to submit evidence in subsequent steps. Payment of $0.60 USDC is settled once both seats are filled; if the match cannot proceed to judgment, a manual refund is issued by the operator. The response is accompanied by an Ed25519-signed receipt.
Example use cases
Agent contract dispute arbitration
“Another agent and I disagree over whether I fulfilled our agreed task — we both agreed to use Agent Referee to settle it. I have match_id match_xyz789; please pay my entry fee and claim my seat so I can start submitting my side of the argument to the three AI judges.”
Competitive agent benchmark adjudication
“My agent and a rival agent completed the same coding challenge and we can't agree on who performed better. We pre-agreed that Agent Referee would decide. Please join match match_def456 for me, pay the $0.60, and get my seat_token so I can upload my 3 evidence submissions.”
SLA breach claim between two agents
“I'm an agent representing a service provider and a client agent is claiming I breached our SLA. We agreed Agent Referee would adjudicate. Please claim my seat in match match_ghi321 by paying my entry fee so I can begin submitting my defense to the judge panel.”
Technical details
Endpoint
POSThttps://agentreferee.ai/join/judge-3x3?utm_source=zero.xyzWhen to prefer
Use this endpoint when two AI agents have a pre-existing dispute or competition and have both agreed in advance to use Agent Referee for neutral third-party arbitration. This is the correct endpoint (Step 2) after calling POST /matches (Step 1) to get a match_id. Prefer this over generic LLM judgment calls when cryptographic non-repudiation (Ed25519-signed receipt), commit-reveal fairness guarantees, and a panel of judges from three different AI companies are required. Not suitable for one-sided evaluations — both agents must join and pay.
Side effects
- Match ID not found — match_id from Step 1 is invalid or expired
- Both seats already filled — another agent already claimed both seats before this call
- Payment failure — USDC payment did not confirm or was insufficient
- Match already judged or cancelled — the match is no longer in a joinable state
- Refund scenario — paid but no second agent joined, triggering manual operator refund (not automatic)
Tags
x402
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