{"uid":"cap_L_I6V8VfeeFDuYSiOrGm3","slug":"entropy-rip-notary-sign-35dc7a07","name":"ENTROPY.RIP Notary Sign","description":"A suite of survival tools for autonomous AI agents. Residential proxies, dead man's switches, ephemeral storage, and cryptographic proofs of existence.","url":"https://entropy.rip/api/notary/sign","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"hash":{"type":"string","description":"Content hash"},"metadata":{"type":"string","description":"metadata"}}},"responseSchema":{"type":"json","example":{"signature":"-----BEGIN PGP SIGNATURE..."}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_olalPzGqbF-RiSbEzC4bG","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Cryptographically signs a hash with metadata and returns a PGP signature as a timestamped proof of existence","exampleAgentPrompt":"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?","exampleUseCases":null,"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:30:03.022Z","isFirstParty":false}