Vibes-Coded Outcome Attestation API

x402

Vibes-Coded Outcome Attestation API is a paid API for AI agents from vibes-coded.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-11).

Generates a cryptographically signed, offline-verifiable attestation record for a completed agent work product or deliverable

Price / call$0.05

Seller volume →—

Success—

StatusUnknown

How this service works

Pay-per-call JSON for AI agents: skill search, listing optimization, install plans, productization, and artifact risk scoring. HTTP 402 → USDC. Full skill marketplace on-site.

Output

Returns a JSON object containing: a unique attestation_id, the signed claim with fields like pages, sha256, and delivered status, an HMAC-SHA256 and Ed25519 dual signature, a public key for offline verification, a nonce, issued_at and generated_at timestamps, the claim_type and subject, and a verify_endpoint URL for on-chain or remote re-verification.

Example use cases

Proof of deliverable for client billing

“Attest that agent-42 just delivered the 12-page audit-report.pdf with SHA-256 hash abc123 under a work_done claim — I need a signed, offline-verifiable receipt I can send to the client as proof before invoicing.”

Accountability trail for multi-agent pipeline

“After my summarization agent finished processing the dataset, create a cryptographic attestation for that completed task — subject is 'dataset summarization', agent ID is agent-99, so I have an immutable record in case there's a dispute later.”

Artifact integrity verification for compliance

“I need to certify that the compliance-check.pdf artifact was genuinely produced and delivered by agent-17 today — can you generate an Ed25519-signed attestation with the file's hash so auditors can verify it offline?”

Technical details

Endpoint

POSThttps://vibes-coded.com/api/v1/outcomes/attest?utm_source=zero.xyz

When to prefer

Choose this endpoint when an AI agent needs to produce a tamper-proof, offline-verifiable cryptographic receipt of completed work — particularly in agent-to-agent handoffs, client billing scenarios, compliance audits, or any context where a human or downstream system needs provable assurance that a specific artifact was delivered by a specific agent. Prefer this over simple logging when non-repudiation and cryptographic verifiability are required.

Side effects

Missing required fields (agent_id, subject, claim_type) → 400 Bad Request
Insufficient USDC balance or failed x402 payment → HTTP 402 Payment Required
Invalid or malformed artifact hash → rejection or unsigned response
Duplicate nonce or replay attack detection → rejection
Service unavailability → 503 or timeout

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "note": "Offline-verifiable attestation.",
    "claim": {
      "pages": 12,
      "sha256": "abc123…",
      "delivered": true
    },
    "nonce": "f3a9b1c2…",
    "subject": "delivery of report.pdf",
    "agent_id": "agent-42",
    "resource": "attest",
    "algorithm": "HMAC-SHA256+Ed25519",
    "issued_at": "2026-08-16T20:00:00Z",
    "signature": "a1b2c3…",
    "claim_type": "work_done",
    "public_key": "-----BEGIN PUBLIC KEY-----…",
    "claim_digest": "d2c8f1e0…",
    "generated_at": "2026-08-16T20:00:00Z",
    "attestation_id": "att_9f2c81e4ab5d6c7d8e9f0a1b2c3d4e5f",
    "verify_endpoint": "/api/v1/outcomes/attest-verify",
    "ed25519_signature": "MEUCIQ…"
  }
}

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