{"uid":"cap_M7XoSx4I28Wf4i8Nhe9Kd","slug":"genexxis-notary-stamp-02b9ad4b","name":"Genexxis Notary Stamp","description":"Timestamp a SHA-256 hash: returns a stored, server-signed receipt (id, hash, label, timestamp, signer, message, signature, verify URL) proving the hash was presented at that time.","url":"https://notary.genexxis.com/stamp?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"hash":{"type":"string","description":"SHA-256 digest of your document, 64 hex chars, optional 0x prefix"},"label":{"type":"string","description":"Optional label, max 120 chars, no | character"}}},"responseSchema":{"type":"json","example":{"id":"3f2b8c1e-5d4a-4f7b-9a62-1c0e8d7f6a55","hash":"0x1a19868d3b6b3f57f523b3202b9ae40155dc1491b3727c608f573acc615d9a0c","label":"contract-v1","signer":"0x02A5A59fdC30Ec50c091F7EE1486D08B49F56940","message":"genexxis-notary:v1|stamp|0x1a19868d3b6b3f57f523b3202b9ae40155dc1491b3727c608f573acc615d9a0c|2026-10-24T20:55:00.123Z|contract-v1","signature":"0x...65-byte signature","timestamp":"2026-10-24T20:55:00.123Z","verifyUrl":"https://notary.genexxis.com/verify"}},"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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_koctXeDva0BmRBcbYpz4E","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Timestamps a SHA-256 hash and returns a cryptographically signed receipt proving the hash existed at a specific moment in time.","exampleAgentPrompt":"Please notarize this SHA-256 hash — 1a19868d3b6b3f57f523b3202b9ae40155dc1491b3727c608f573acc615d9a0c — and label it 'contract-final-v2' so I have a signed, timestamped receipt proving it existed right now.","exampleUseCases":[{"title":"Pre-deadline contract submission proof","prompt":"I need to prove this contract existed before the submission deadline — can you stamp the SHA-256 hash a3f8c2d19b0e47f65c1d8a290bcf3e7a4521b0d6e8f9c3a71d2b4e5f08c6a19d with the label 'vendor-contract-Q4-2025' and give me the signed receipt?"},{"title":"Intellectual property creation timestamp","prompt":"I just finished writing my white paper and want proof of when it was created — please timestamp the SHA-256 hash 7d4e2a1f9b3c8e6d0f5a2c7b4e1d8f3a6c9b0e5d2f7a4c1b8e3d6a9f0c5b2e8 with the label 'whitepaper-original-draft'."},{"title":"Software release integrity certification","prompt":"Before I publish this software release, stamp the hash 2b9f4e1d7a3c6b8e0f5d2a9c4b7e3f1d6a8c0b5e2f4a7c9b1e3d8f6a0c2b5e9 with the label 'app-v2.3.1-release' so users can verify it hasn't been tampered with."}],"resultDescription":"A JSON receipt containing: a unique record ID (UUID), the submitted hash, the optional label, the server's signer Ethereum address, an ISO 8601 timestamp of when the hash was presented, a structured signed message string, a 65-byte cryptographic signature over that message, and a verifyUrl pointing to the endpoint where the receipt can be independently verified.","failureModes":["Invalid hash format (not 64 hex chars) returns a 400 error","Hash with invalid characters or wrong length rejected","Label exceeding 120 characters or containing pipe character rejected","Payment failure or insufficient USDC balance returns 402","Server signing key unavailable returns 500","Duplicate hash submission creates a new independent receipt (not idempotent)"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, cryptographically signed proof-of-existence for a document or file hash without requiring a full blockchain transaction. It is ideal for compliance workflows, legal timestamping, intellectual property protection, and audit trails where a server-signed receipt is sufficient. Prefer this over blockchain anchoring when cost, latency, or simplicity are priorities, and the trust anchor of a known server key is acceptable.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T12:33:05.390Z","isFirstParty":false,"canonicalSlug":"genexxis-notary-stamp-02b9ad4b"}