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Verdict Grounding Check
x402
Verdict Grounding Check is a paid API for AI agents from verdict.kechlab.com, paid per call via x402, $0.0174/call, status unknown (last checked 2026-10-21).
Verifies whether a claim is supported, unsupported, contradicted, or uncertain relative to a reference source text, with probabilities.
Price / call$0.0174
Success—
StatusUnknown
How this service works
Hallucination check for RAG: is a claim supported by the source text? Returns supported, unsupported, contradicted or uncertain with probabilities, so an agent can verify an answer before showing it.
Output
Returns a grounding classification label (supported, unsupported, contradicted, or uncertain) along with probability scores for each category, allowing the agent to decide whether the claim is safe to present to the user.
Example use cases
RAG answer hallucination guard
“I'm about to show a user this generated answer from my RAG system. Check whether the claim 'The patient should take 500mg of ibuprofen twice daily' is supported by the retrieved medical document I'll paste here, and tell me if it's supported, unsupported, or contradicted with probabilities.”
Fact-check before publishing
“Before I publish this AI-written summary, verify that the claim 'Revenue grew 23% year-over-year' is actually grounded in the earnings report text I retrieved — return the verdict and confidence scores.”
Chatbot answer quality gate
“My chatbot just said 'The return policy covers 60 days' — can you check whether that claim is supported, contradicted, or uncertain given this policy document text I retrieved from our knowledge base?”
Technical details
Endpoint
POSThttps://verdict.kechlab.com/v1/grounding?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a calibrated, probabilistic grounding verdict specifically designed for RAG hallucination detection — it returns structured label + probabilities rather than a binary yes/no, and is purpose-built for claim-vs-source verification at low cost per call. Prefer it over general LLM self-evaluation when you need auditable, deterministic per-call verdicts.
Side effects
- Empty or missing claim field returns a validation error
- Source text too long may exceed token limits
- Ambiguous or vague claims may return 'uncertain' with near-equal probabilities
- Network timeout for very long source documents
- Payment failure (402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claim | string | the claim to verify |
| source | string | the reference text |
Tags
x402
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