{"uid":"cap_Smil8HlqRPbjBFJyKrIuB","slug":"receiptstamp-proof-of-execution-notary-f735ef98","name":"ReceiptStamp Proof-of-Execution Notary","description":"Signed proof-of-execution notary for AI agents: POST a payload, get hash + timestamp + signature receipt verifiable via /pubkey. Independent attestation for agent jobs and tool outputs. Pay-per-stamp x402 USDC on Base. Not custody, escrow, or delivery verification.","url":"https://receiptstamp.panmediatech.workers.dev/x402/stamp","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_JfbiwXJJgSQETgNHowx6G","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Stamps an arbitrary payload with a cryptographically signed receipt (ed25519-sha256 hash, timestamp, signature, keyId) to prove execution occurred at a specific moment.","exampleAgentPrompt":"Can you notarize this payload for me — stamp it with an ed25519-signed receipt so I have a verifiable hash, timestamp, and signature I can check against the public key later?","exampleUseCases":[{"title":"Audit trail for agent actions","prompt":"After my agent completes each task, I want a signed receipt stamped on the output so I have an independent, verifiable audit trail proving exactly when each action was executed — can you set that up?"},{"title":"Tamper-proof notarization of documents","prompt":"I have a JSON document I need to notarize before sending it to a client — can you stamp it with a cryptographic receipt so I can prove later it wasn't altered after this moment?"},{"title":"Proof of computation at specific time","prompt":"My pipeline just finished a sensitive computation and I need to prove to a third party that it ran at a specific time without relying on my own server's word — can you get a signed timestamp receipt for the result?"}],"resultDescription":"Returns a receipt object containing: a SHA-256 hash of the payload, an ISO timestamp, an ed25519 signature over the hash and timestamp, the keyId identifying the signing key, and the algo string 'ed25519-sha256'. The signature can be independently verified against the public key at /pubkey.","failureModes":["Empty or missing payload may return an error or produce a receipt over an empty body","Payment not provided or insufficient USDC ($0.02) returns a 402 Payment Required response","Malformed request may return a 4xx error","Service unavailability on Cloudflare Workers edge returns a 503"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, independent, third-party cryptographic proof-of-execution receipt with a verifiable ed25519 signature — especially in agentic workflows where auditability and non-repudiation of actions matter. Prefer it over self-signed timestamps or centralized notaries when you want a publicly verifiable signature against a known public key.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:37:23.722Z","isFirstParty":false}