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ForgeMesh Notary — AI Inference Attestation
x402
ForgeMesh Notary — AI Inference Attestation is a paid API for AI agents from notary.forgemesh.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Creates a cryptographic receipt for a single AI inference: an Ed25519-signed attestation, SHA-256 content hash, receipt token, and Merkle anchor status that proves an AI model produced a specific output.
Price / call$0.001
Success—
StatusUnknown
How this service works
Notarize AI output: a signed Ed25519 attestation of the model response plus sha256 content hash, receipt token, and Merkle anchor status for one AI inference — a cryptographic receipt for inference that lets you prove an AI said X and verify model output authenticity, checkable free by anyone, anytime.
Output
Returns an Ed25519-signed attestation object containing: a digital signature over the content, a SHA-256 hash of the prompt+response+model_id+timestamp bundle, a receipt token (unique identifier for this notarization), and a Merkle anchor status indicating whether the record has been anchored to a Merkle tree. The receipt is publicly verifiable by anyone at any time at no cost.
Example use cases
Legal evidence of AI advice
“I need a notarized receipt proving that claude-3-5-sonnet-20241022 generated this contract summary — the original prompt was 'List all indemnification clauses' and the response was 'Section 9.1 indemnifies the licensor against third-party IP claims.' Timestamp it as 2025-06-10T09:00:00Z so it's legally defensible.”
Compliance audit trail for regulated AI outputs
“Our compliance team needs a signed attestation for every AI decision we log. Notarize this response from openai/gpt-4-turbo: the prompt was 'Is this transaction flagged for AML review?' and the model said 'Yes, flag for review — unusual cross-border pattern detected.' Client timestamp is 2025-06-09T18:45:00Z.”
Journalism fact-check provenance
“I want a cryptographic receipt showing that the model openai/gpt-5 produced this fact-check summary — prompt was 'Verify the claim: city unemployment fell 3% in Q1' and response was 'Bureau of Labor data confirms a 2.9% reduction, within rounding of the claim.' Please notarize it now so readers can verify the AI's exact output.”
Technical details
Endpoint
POSThttps://notary.forgemesh.io/api/notarizeWhen to prefer
Choose this endpoint when you need a single-inference cryptographic receipt with a human-readable receipt token and Merkle anchoring — ideal for one-off notarizations where auditability, legal defensibility, or public verifiability of a specific AI output is required. Use the sibling bulk endpoint for high-volume batch attestation. Prefer this over generic logging or timestamping services when the signed Ed25519 attestation and SHA-256 content hash are specifically needed to prove model identity and output integrity.
Side effects
- Missing required fields (prompt or response absent) — returns 400 Bad Request
- Malformed model_id format — returns 400 with validation error
- Payload too large (metadata > 4 KB) — returns 413 or 400
- Payment failure (x402 micropayment not settled) — returns 402 Payment Required
- Invalid ISO-8601 client_timestamp format — returns 400
- Service unavailable or signing key error — returns 500
- Merkle anchor may be pending at time of response — anchor status returns 'pending' rather than confirmed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| prompt | string | Exact prompt/input sent to the model |
| metadata | object | Optional caller metadata, <= 4 KB — accepted but NOT persisted or hashed (reserved for future opt-in retention) |
| model_id | string | Model identifier, e.g. openai/gpt-5 or claude-fable-5 |
| response | string | Exact model output being notarized |
| client_timestamp | string | ISO-8601 time the inference ran (optional; included in the content hash) |
Output
Schema · Response
{
"type": "json",
"example": {
"anchor": {
"status": "pending"
},
"model_id": "openai/gpt-5",
"algorithm": "ed25519",
"signature": "base64-ed25519-signature",
"receipt_url": "https://notary.forgemesh.io/api/receipt/att_0123456789abcdef01234567",
"content_hash": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
"notarized_at": "2026-07-03T12:00:01.000Z",
"receipt_token": "private-receipt-token",
"signer_pubkey": "base64-ed25519-public-key",
"attestation_id": "att_0123456789abcdef01234567",
"payload_stored": false,
"client_timestamp": "2026-07-03T12:00:00Z"
}
}Tags
x402
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