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Verity Suite Arbiter Pro
x402
Verity Suite Arbiter Pro is a paid API for AI agents from verity-suite.onrender.com, paid per call via x402, $0.35/call, status unknown (last checked 2026-09-14).
Adjudicates between two or more conflicting claims by evaluating provided evidence and returning a calibrated, fail-closed verdict with confidence score.
Price / call$0.35
Success—
StatusUnknown
How this service works
The trust fabric for AI agents — calibrated, fail-closed services agents pay per call.
Output
Returns a structured object with a verdict enum ('claim_supported', 'undecidable', or 'insufficient_evidence'), a calibrated 0–1 confidence score (0.0 if verdict is not claim_supported), a list of concrete reasons citing specific evidence items and claim indices, the zero-based index of the best-supported claim (only when claim_supported), and optionally a list of missing evidence types needed to decide.
Example use cases
Example prompt
“I have two conflicting claims about climate change attribution — claim 0: 'Human CO2 emissions are the primary driver of post-1950 warming' and claim 1: 'Solar variability explains most observed warming' — and here are three evidence excerpts from IPCC AR6 and NASA datasets. Which claim does the evidence support, and how confident are you?”
Technical details
Endpoint
POSThttps://verity-suite.onrender.com/arbiter/proWhen to prefer
Use this endpoint when an AI agent needs to resolve a factual or argumentative dispute between two or more specific claims using retrieved evidence, and requires a calibrated, fail-closed verdict rather than a probabilistic summary. Prefer it over general LLM reasoning when you need structured output with explicit confidence scores, traceable reasons referencing claim indices, and a defined fallback to 'insufficient_evidence' rather than hallucinated answers. Ideal for agentic pipelines where downstream decisions depend on knowing whether evidence is strong enough to decide.
Side effects
- Fewer than two claims provided — verdict will be insufficient_evidence with confidence 0.0
- Evidence array is empty or off-topic — verdict returns insufficient_evidence
- Evidence is present but equally supports both claims — verdict is undecidable with confidence 0.0
- Malformed input schema (missing required 'claims' field) — request rejected
- Payment failure or insufficient USDC balance — call not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claimsrequired | array | Two or more mutually conflicting claims/positions to adjudicate, one per item, in stable order. Fewer than two means nothing to adjudicate. |
| evidence | array | Retrieved evidence excerpts/sources to judge from. If empty, weak, or off-topic, the verdict MUST reflect that (insufficient_evidence). |
| question | string | The specific point in dispute the claims are answering, if narrower than the claims themselves. Used to scope relevance only. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| reasonsrequired | array | Concrete reasons that cite, by content, which evidence item supports or undercuts which claim (reference claims by their index). Never vague summaries. |
| verdictrequired | string | claim_supported = exactly one claim is clearly better supported by the provided evidence. undecidable = relevant evidence is present but balanced, mutually contradictory, or equally (un)supportive, with no clear winner. insufficient_evidence = no provided evidence, or it is too thin/off-topic/low-quality to favor any claim, OR fewer than two distinct claims were given. |
| confidencerequired | number | Calibrated 0..1 strength of the verdict: how decisively the provided evidence favors the chosen claim. MUST be 0.0 whenever verdict is not claim_supported. |
| missing_evidence | array | What specific evidence would be needed to decide. Populate when verdict is undecidable or insufficient_evidence; may be empty when claim_supported. |
| best_supported_index | — | Zero-based index, as a decimal string (e.g. "0"), into 'claims' of the better-supported claim. Present ONLY when verdict=claim_supported, and exactly one index; omit entirely otherwise. |
Tags
x402
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