{"uid":"cap_MymTSKE35jOVD8-m810Qy","slug":"kairostamp-receipt-verification-11ab6e11","name":"Kairostamp Receipt Verification","description":"Receipt verification: read-only hash-chain verification of one existing Kairostamp receipt id. Recomputes the canonical SHA-256 digest, compares it with the stored chain hash, checks linkage to the preceding entry and reports whether the entry is covered by an on-chain checkpoint. Performs no outbound fetch. Single GET query parameter (receipt_id).","url":"https://kairostamp.com/api/v1/verify","method":"GET","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_aZxEPkvNV_YTDmpeaWhFo","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x036CbD53842c5426634e7929541eC2318f3dCF7e","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies an existing Kairostamp receipt by recomputing its SHA-256 digest, checking hash-chain linkage to the preceding entry, and reporting whether it is covered by an on-chain checkpoint.","exampleAgentPrompt":"Can you verify Kairostamp receipt 85cd424c-b68b-440e-8f4f-e02147799f30 and tell me whether it's valid, properly linked in the hash chain, and covered by an on-chain checkpoint?","exampleUseCases":[{"title":"Auditing a document timestamp receipt","prompt":"I have a Kairostamp receipt with ID 85cd424c-b68b-440e-8f4f-e02147799f30 from a document I timestamped last week — can you verify it's still valid and that the chain hash checks out?"},{"title":"Compliance check before contract execution","prompt":"Before we proceed, I need you to verify that Kairostamp receipt b3a12f9e-44cc-4d1e-9f22-abc123456789 is authentic, correctly linked to its predecessor in the chain, and anchored on-chain."},{"title":"Detecting tampered receipts in automated pipeline","prompt":"We just received receipt ID f7c0012d-99b2-47ea-a341-deadbeef0001 from a partner — run a Kairostamp verification on it and tell me if the verdict is valid or if there's any integrity issue."}],"resultDescription":"Returns a JSON object containing the receipt UUID, a boolean indicating whether it exists, a verdict enum (valid, invalid, indeterminate, or quarantined_legacy), chain details (sequence number, chain hash, previous chain hash, and a linked boolean), and an anchor object indicating whether an on-chain checkpoint covers this entry along with network and status details where available.","failureModes":["Receipt ID does not exist in the system — exists: false, verdict: indeterminate","Malformed or non-UUID receipt_id — HTTP 400 or validation error","Receipt hash mismatch — verdict: invalid indicating possible tampering","No on-chain checkpoint yet — anchor.covered: false with explanatory note","Legacy receipt with incompatible format — verdict: quarantined_legacy"],"whenToPreferThis":"Use this endpoint when you need to cryptographically verify the integrity of a receipt previously issued by a Kairostamp paid endpoint, without making any external network requests. It is the canonical tamper-detection tool for Kairostamp receipts, checking both the local hash-chain linkage and on-chain anchor coverage in a single lightweight GET call. Prefer it over manual digest recomputation or external blockchain explorers for Kairostamp-specific receipts.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-16T00:32:02.569Z","isFirstParty":false}