API Evangelist overlay for the SYNTHORA Agent Notary OpenAPI

overlay: 1.0.0
info:
  title: API Evangelist overlay for the SYNTHORA Agent Notary OpenAPI
  version: '2026-09-19'
  description: 'Non-destructive enhancements on top of openapi/hergertsynthora-com-agent-notary-openapi.yml (fetched
    verbatim from https://notary.hergertsynthora.com/openapi.json on 2026-09-19). The source declares no tags, no
    components and no securitySchemes; the overlay adds a tag, termsOfService, externalDocs to the notary llms.txt
    and cross-links the A2A card and MCP endpoint that expose the same operation. It does NOT add a security scheme:
    the x402 requirement is stated in info.x-payment and the 402 response, and declaring a scheme the provider did
    not declare would change the contract.'
extends: hergertsynthora-com-agent-notary-openapi.yml
actions:
- target: $.info
  update:
    termsOfService: https://hergertsynthora.com/terms/
    x-apievangelist:
      profile: https://github.com/api-evangelist/hergertsynthora-com
      generated: '2026-09-19'
      method: searched
      source: https://notary.hergertsynthora.com/openapi.json
      a2a_card: a2a/hergertsynthora-com-notary-agent-card.json
      mcp: https://notary.hergertsynthora.com/mcp
      llms_txt: llms/hergertsynthora-com-notary-llms.txt
- target: $
  update:
    externalDocs:
      description: Notary llms.txt (endpoints, discovery, payTo)
      url: https://notary.hergertsynthora.com/llms.txt
    tags:
    - name: notary
      description: Proof-of-existence, proof-of-execution and proof-of-agreement receipts, Ed25519-signed.
- target: $.paths['/service'].post
  update:
    tags:
    - notary
    x-apievangelist-note: 'Observed 2026-09-19: anonymous POST returns 402 with x402Version 2, amount 2000 (0.002
      USDC), payTo 0x6D9F318463168fF637b50E5b9a21392e97c7c167, headers payment-required (base64 JSON), x-402-asset,
      x-402-network, x-402-payto, x-free-tier: 3.'