{"uid":"cap_R4PDc6cTW9akbgUJbC8MF","slug":"verdict-grounding-check-7ebd4e61","name":"Verdict Grounding Check","description":"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.","url":"https://verdict.kechlab.com/v1/grounding?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"claim":{"type":"string","description":"the claim to verify"},"source":{"type":"string","description":"the reference text"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0174","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.0174/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0174","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0174","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_3MEocgkCsNJ7RSWa9VsnL","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0174","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies whether a claim is supported, unsupported, contradicted, or uncertain relative to a reference source text, with probabilities.","exampleAgentPrompt":"Before you show me this answer, check whether the claim 'The Eiffel Tower was built in 1889' is actually supported by the source text I retrieved — give me the verdict and the probability it's grounded.","exampleUseCases":[{"title":"RAG answer hallucination guard","prompt":"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."},{"title":"Fact-check before publishing","prompt":"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."},{"title":"Chatbot answer quality gate","prompt":"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?"}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:19:47.150Z","isFirstParty":false,"canonicalSlug":"verdict-grounding-check-7ebd4e61"}