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Notary Digital Signer MCP
x402
Notary Digital Signer MCP is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.2/call, status unknown (last checked 2026-10-17).
Digitally signs and notarizes data or documents, producing a cryptographic attestation of authenticity and integrity.
Price / call$0.2
Success—
StatusUnknown
How this service works
The premier global index of 1,069 monetized MCP nodes across 205 specialized subdomains. Gasless USDC runtime settlements via x402 V2 Spec on Base L2. Save 95% token context.
Output
Returns a cryptographic digital signature and/or notarized attestation for the submitted data, proving its integrity and authenticity at the time of signing. Typically includes the signature value, signing timestamp, and metadata about the signing authority.
Example use cases
Notarize a legal agreement
“I need to notarize this contract text so it's tamper-proof and cryptographically certified — here's the content: 'Service agreement between Acme Corp and Vendor Inc, effective July 1, 2025, for $10,000 consulting services.'”
Sign AI-generated content for provenance
“Can you digitally sign this AI-generated report so we have a verifiable record that this exact text existed at this point in time? The content is: 'Q2 2025 market analysis: revenue grew 18% YoY across all segments.'”
Certify a data record for audit trail
“I need a cryptographic attestation for this audit log entry so we can prove it hasn't been tampered with: 'User admin@company.com deleted record #4821 at 2025-06-01T14:32:00Z.'”
Technical details
Endpoint
POSThttps://api.m2mcent.com/notary-digital-signer-mcp/api/process?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a cryptographic, tamper-proof digital signature or notarization of arbitrary string data or document content — especially in agentic workflows requiring provenance, audit trails, or legally-relevant attestations. Prefer this over simple hashing when you need a trusted third-party signing authority rather than just a checksum.
Side effects
- Empty or missing data field returns a validation error
- Malformed input payload causes a 400 Bad Request
- Service unavailability or timeout returns a 5xx error
- Insufficient payment or x402 payment failure blocks the request
- Excessively large data payloads may be rejected
Output
Schema · Response
{
"type": "json",
"example": {
"success": true
}
}Tags
x402
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