# Verity Suite Arbiter – Quick Claim Adjudication

> Verity Suite Arbiter – Quick Claim Adjudication is a paid API for AI agents from suite.veritylayer.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Adjudicates two or more conflicting claims against provided evidence and returns a calibrated verdict with signed receipt

## Facts

- Endpoint: POST https://suite.veritylayer.dev/arbiter/quick
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/verity-suite-arbiter-quick-claim-adjudication-88e8c273
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HKdTZ7niPTxpUv-xURNOo

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability verity-suite-arbiter-quick-claim-adjudication-88e8c273 -d '<json body>'
```

Example prompt: I need you to adjudicate these two conflicting claims — 'The drug reduced mortality by 30%' vs 'The drug showed no significant mortality benefit' — using these three study excerpts as evidence, and tell me which one is supported, with your reasons and a signed receipt I can verify later.

## When to prefer this

Choose this endpoint when an AI agent needs a calibrated, auditable judgment on exactly which of two or more conflicting claims is supported by retrieved evidence — especially when a signed, verifiable receipt matters for downstream trust or compliance. It is purpose-built for agent-to-agent trust pipelines, RAG verification steps, and any workflow where a fail-closed 'insufficient_evidence' verdict is safer than a hallucinated answer. Prefer it over general LLM reasoning when you need a stable, reproducible verdict tied to specific evidence and an external proof of adjudication.

## Known failure modes

- Fewer than two claims provided — nothing to adjudicate, endpoint requires at least two
- Empty or off-topic evidence array — verdict will be 'insufficient_evidence' by design (fail-closed)
- Claims are not actually in conflict — adjudication may yield 'undecidable'
- Evidence is weakly related to the question — service reflects this in verdict rather than guessing
- Payment not included or insufficient — x402 payment failure before processing
- Malformed input schema — 400-level error if required fields (type, method, bodyType, body, claims) are missing

## How this service works

The trust fabric for AI agents — calibrated, fail-closed services agents pay per call.

## Output

Returns a JSON object with: a verdict enum ('claim_supported', 'undecidable', or 'insufficient_evidence'), a confidence score, an array of concrete reasons that cite which evidence items support or undercut which claims by index, and an optional Ed25519-signed VerityLayer receipt that can be independently verified at the engine's POST /receipt/verify endpoint.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "claims": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "title": "Claims",
   "description": "Two or more mutually conflicting claims/positions to adjudicate, one per item, in stable order. Fewer than two means nothing to adjudicate."
  },
  "evidence": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "title": "Evidence",
   "description": "Retrieved evidence excerpts/sources to judge from. If empty, weak, or off-topic, the verdict MUST reflect that (insufficient_evidence)."
  },
  "question": {
   "anyOf": [
    {
     "type": "string",
     "maxLength": 2000
    },
    {
     "type": "null"
    }
   ],
   "title": "Question",
   "default": null,
   "description": "The specific point in dispute the claims are answering, if narrower than the claims themselves. Used to scope relevance only."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/verity-suite-arbiter-quick-claim-adjudication-88e8c273/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suite.veritylayer.dev](https://www.zero.xyz/host/suite.veritylayer.dev/llms.txt)