# Verity Suite Arbiter Pro

> Verity Suite Arbiter Pro is a paid API for AI agents from suite.veritylayer.dev, paid per call via x402, $0.35/call, status unknown (last checked 2026-09-14).

Adjudicates mutually conflicting claims against provided evidence, returning a signed verdict with confidence score and cited reasons

## Facts

- Endpoint: POST https://suite.veritylayer.dev/arbiter/pro
- Price: $0.35/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-pro-582504e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VI9kdpKvC17NewbQlRSoZ

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-pro-582504e4 -d '<json body>'
```

Example prompt: I have two conflicting claims about climate policy — 'Renewable energy now supplies over 30% of global electricity' vs 'Renewables account for less than 20% of global electricity' — and I've pulled three evidence excerpts from recent IEA reports. Can you adjudicate which claim is better supported and give me a signed verdict with your reasoning?

## When to prefer this

Choose this endpoint when you need a structured, calibrated, fail-closed ruling on a factual dispute between exactly two or more conflicting claims, especially when you have retrieved evidence and need a citable, optionally signed verdict. Prefer it over generic LLM prompting when auditability (signed receipt), determinism, and explicit confidence scoring matter — for example in RAG pipelines, multi-agent debate resolution, compliance workflows, or any context where the adjudication must be loggable and verifiable. Not appropriate for open-ended summarization, content generation, or single-claim fact lookup.

## Known failure modes

- Fewer than two claims provided — nothing to adjudicate, returns error
- Evidence array is empty or off-topic — verdict will be insufficient_evidence
- Claims are not mutually contradictory — adjudication may be undecidable
- Evidence excerpts are truncated or paraphrased — may reduce confidence or yield undecidable
- Signing not configured server-side — receipt field returns null
- Malformed input schema (missing required fields) — HTTP 4xx error

## 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 citing specific evidence items by content and claim index, and an optional Ed25519-signed VerityLayer receipt for tamper-evident audit logging.

## 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-pro-582504e4/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)