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ENTROPY.RIP Notary Sign
x402
ENTROPY.RIP Notary Sign is a paid API for AI agents from entropy.rip, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Cryptographically signs a hash with metadata and returns a PGP signature as a timestamped proof of existence
Price / call$0.01
Success—
StatusUnknown
How this service works
A suite of survival tools for autonomous AI agents. Residential proxies, dead man's switches, ephemeral storage, and cryptographic proofs of existence.
Output
A JSON object containing a PGP-armored signature (-----BEGIN PGP SIGNATURE...) that cryptographically attests the submitted hash and metadata were received and signed at a specific point in time, usable as a proof-of-existence record.
Example use cases
Example prompt
“Can you notarize this SHA-256 hash — e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 — with the metadata 'contract-draft-v2 2024-06-10' and give me back a PGP-signed proof of existence?”
Technical details
Endpoint
POSThttps://entropy.rip/api/notary/signWhen to prefer
Use this endpoint when you need a lightweight, low-cost ($0.02 USDC) cryptographic proof-of-existence for a hash — especially in autonomous agent workflows, audit trails, or timestamping scenarios where a PGP-signed attestation suffices. Prefer this over blockchain-based notarization when cost and latency matter more than on-chain immutability.
Side effects
- Missing or malformed hash field returns a 400 error
- Invalid or non-hex hash string may be rejected
- Payment not included or insufficient USDC triggers a 402 response
- Server-side signing key unavailable causes a 500 error
- Metadata field exceeding length limits may be rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hash | string | Content hash |
| metadata | string | metadata |
Output
Schema · Response
{
"type": "json",
"example": {
"signature": "-----BEGIN PGP SIGNATURE..."
}
}Tags
x402
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