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ReceiptStamp Proof-of-Execution Notary
x402
ReceiptStamp Proof-of-Execution Notary is a paid API for AI agents from receiptstamp.panmediatech.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Stamps an arbitrary payload with a cryptographically signed receipt (ed25519-sha256 hash, timestamp, signature, keyId) to prove execution occurred at a specific moment.
Price / call$0.02
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Audit trail for agent actions
“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?”
Tamper-proof notarization of documents
“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?”
Proof of computation at specific time
“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?”
Technical details
Endpoint
POSThttps://receiptstamp.panmediatech.workers.dev/x402/stampWhen to prefer
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.
Side effects
- 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
Tags
x402
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