{"uid":"cap__7z449eNwGSIEflXSXqSv","slug":"model-substitution-attestation-fingerprint-verify-25d63886","name":"Model Substitution Attestation (Fingerprint & Verify)","description":"Proof-of-Model: detect silent model substitution at any OpenAI-compatible inference endpoint. mode=fingerprint records what a seller serves today; mode=verify re-probes later and proves whether the weights changed. Deterministic, evidence included, no model used to judge.","url":"https://pearl-valium-stickers-upc.trycloudflare.com/v1/attest/model?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"kind":{"type":"string"},"claim":{"type":"string"},"verdict":{"type":"string"},"comparisons":{"type":"array"},"mean_similarity":{"type":"number"},"self_consistency_now":{"type":"number"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.1","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":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_lvhORnwRetbaDQtP6x4hv","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Detects silent model weight substitution at any OpenAI-compatible inference endpoint by fingerprinting a model's responses and later verifying whether the weights have changed.","exampleAgentPrompt":"Fingerprint the inference endpoint at https://api.example.com and record a proof of what model they're currently serving so I can verify later whether they swap it out.","exampleUseCases":[{"title":"Vendor model integrity audit","prompt":"I'm paying for GPT-4-class inference from a third-party provider — fingerprint their endpoint at https://api.myprovider.com right now and save the record so I can prove later if they silently downgrade to a cheaper model."},{"title":"Periodic model drift monitoring","prompt":"Re-probe the inference endpoint at https://api.myprovider.com in verify mode and tell me whether the model weights match the fingerprint I took last week — I need the similarity scores and a clear verdict."},{"title":"Pre-contract model verification","prompt":"Before I sign up for this LLM API service at https://api.newvendor.ai, fingerprint what model they're actually serving today so I have documented evidence of the baseline in case they swap it after I commit."}],"resultDescription":"Returns an attestation record containing a kind field (fingerprint or verify), a claim about the model being served, a verdict on whether weights match, an array of probe comparisons, a mean similarity score, and a self-consistency score — all deterministically derived with raw evidence included, no LLM judge used.","failureModes":["Target endpoint unreachable or returns non-OpenAI-compatible responses","Fingerprint record not found when attempting verify mode","Endpoint rate-limits or blocks the probe queries","Inconclusive verdict due to high variance in model responses","Payment of 0.1 USDC not processed, blocking request","Self-consistency score too low to produce reliable fingerprint"],"whenToPreferThis":"Choose this endpoint when you need deterministic, evidence-based proof of model identity at an OpenAI-compatible inference endpoint — especially for auditing third-party LLM providers for silent model substitution. Unlike model-based classifiers or self-reported metadata, this endpoint uses behavioral fingerprinting with raw evidence, making it suitable for compliance, vendor accountability, or long-term monitoring workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:39:41.033Z","isFirstParty":false,"canonicalSlug":"model-substitution-attestation-fingerprint-verify-25d63886"}