API Evangelist enhancements for Exchange Rates API

overlay: 1.0.0
info:
  title: API Evangelist enhancements for Exchange Rates API
  version: 1.0.0
extends: ../openapi/apilayer-exchangeratesapi-openapi.yml
x-generated: '2026-09-12'
x-method: generated
x-source: derived from the provider spec plus the probed artifacts in this repo; the original spec is
  never mutated
actions:
- target: $.info
  description: Record where this contract was harvested from and who publishes it.
  update:
    x-apis-io-provider: apilayer
    x-apis-io-source: https://docs.apilayer.com/exchangeratesapi/docs/api-documentation
    x-apis-io-harvested: '2026-09-12'
- target: $
  description: Declare the account-wide query-string API key that every operation requires but the source
    spec does not declare as a securityScheme.
  update:
    x-apilayer-auth:
      scheme: apiKey
      in: query
      name: access_key
      artifact: authentication/apilayer-authentication.yml
- target: $
  description: Point at the derived error catalog; the source spec carries examples but no consolidated
    registry.
  update:
    x-error-catalog: errors/apilayer-error-codes.yml
    x-error-envelope: '{"success": false, "error": {"code": <int>, "type": "<slug>", "info": "<sentence>"}}'
    x-status-code-fidelity: observed 200 on auth failure; branch on the success boolean, not the HTTP
      status
- target: $
  description: Record the read-only nature of the surface for agent planning.
  update:
    x-write-surface: false
    x-idempotency: na (no mutating operations)
    x-reversibility: na (no mutating operations)