{"uid":"cap_IjXzYoO4k_GwolcbjPKGr","slug":"synthora-agent-notary-trust-layer-eu-421978af","name":"SYNTHORA Agent Notary (Trust Layer EU)","description":"Proof-of-existence, proof-of-execution and proof-of-agreement for M2M deals. Notarize a SHA-256, get an Ed25519-signed receipt anyone can verify later.","url":"https://notary.hergertsynthora.com/service","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"op":{"enum":["notarize","execution","agreement","verify"],"type":"string","description":"operation"},"hash":{"type":"string","description":"sha256 hex (notarize/verify)"},"input":{"description":"execution input (execution)"},"terms":{"description":"agreement terms (agreement)"},"output":{"description":"execution output (execution)"},"content":{"description":"content to hash (notarize)"},"party_a":{"type":"string"},"party_b":{"type":"string"},"receipt_id":{"type":"string","description":"nt-.. (verify)"}}},"responseSchema":{"type":"json","example":{"ok":true,"niche":"notary","result":{"kind":"document","sha256":"..","statement":"SYNTHORA Trust Layer certifies ...","receipt_id":"nt-..","notarized_at":"2026-07-10T00:00:00+00:00"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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_NydjXpuea8ALciAg-HnGE","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":"Notarizes SHA-256 hashes and M2M execution/agreement records, returning Ed25519-signed receipts for tamper-evident proof-of-existence, proof-of-execution, and proof-of-agreement.","exampleAgentPrompt":"Notarize this SHA-256 hash — a4f3c2b1...9d8e — using SYNTHORA's Trust Layer and give me the signed receipt ID I can use to verify it later.","exampleUseCases":[{"title":"Timestamping a signed contract hash","prompt":"I've got a SHA-256 hash of a contract I just finalized — 3b4e9f2a...c1d7 — can you notarize it with SYNTHORA's Trust Layer so I have a signed receipt proving it existed today?"},{"title":"Proof-of-execution for an agent task","prompt":"Two of my agents just completed a data exchange: agent-alpha was party A, agent-beta was party B, and here are the input and output payloads. Can you create a proof-of-execution record on SYNTHORA Notary so I have an auditable receipt of what was processed?"},{"title":"Verifying a prior notarization receipt","prompt":"I have a SYNTHORA notary receipt ID — nt-7f3a29c — and I need to verify it's still valid and matches the original hash, can you check it?"}],"resultDescription":"Returns a JSON object with ok:true, the operation kind (document, execution, or agreement), the SHA-256 digest, a human-readable certification statement issued by SYNTHORA Trust Layer, a unique receipt ID (prefixed nt-), and an ISO 8601 notarized_at timestamp. The receipt is Ed25519-signed and can be independently verified later using the verify operation.","failureModes":["Invalid or malformed SHA-256 hex string returns an error with the hash field","Missing required fields for the chosen op (e.g. missing terms for agreement) returns a validation error","Unknown or invalid receipt_id on verify returns a not-found or invalid receipt error","Malformed op enum value returns an unsupported operation error","Payment failure or insufficient USDC balance returns HTTP 402 before processing"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, cryptographically-signed proof-of-existence or proof-of-execution record for M2M or agent-to-agent interactions, particularly in EU-regulated contexts. Prefer it over blockchain-based notarization when low cost ($0.002/call), low latency, and Ed25519-signed receipts are sufficient — and when you need a verify operation to later audit the same record. Best suited for AI agent pipelines that require audit trails without smart-contract overhead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:32:14.116Z","isFirstParty":false}