SMKlog Operations API

openapi: 3.2.0
info:
  title: SMKlog Quote Operations API
  version: 1.4.0
  summary: Live parcel rates from a US origin, a checkout handed to a human, and where that checkout stands.
  description: 'Live parcel rates from USPS, UPS, FedEx and DHL Express for a single shipment sent from a US origin: inside the US, or to Canada, the UK, Germany or Australia. Describe the item in plain words and the packed box size and weight are estimated server-side; supply exact dimensions and weight to skip the estimate. No account and no key. Rate limited per client (about 80 quote requests per hour); quotes cost real money to produce, so cache on your side and do not poll. Buying a label happens on smklog.com — this API prices, it does not sell.'
  termsOfService: https://smklog.com/terms
  contact:
    name: SMKlog
    email: info@smklog.com
    url: https://smklog.com/developers/
  x-publisher: SMKlog (SMKLOG-2022 LLC)
servers:
- url: https://quote-api.smklog.com
  description: 'Production. There is no sandbox host: quoting is free and read-only, so production is the place to try it.'
security:
- {}
- clientCredentials:
  - quote
tags:
- name: Operations
  description: Liveness.
paths:
  /status:
    get:
      operationId: status
      tags:
      - Operations
      x-agentic-access:
        action-class: connected
        consequence: read
        subject: optional
        audit: none
        note: Unauthenticated liveness probe; no token is read.
      summary: Liveness probe
      description: Answers 200 with the serving version while the service is up. Linked from the RFC 9727 api-catalog as the status relation; it carries no incident history — the status page at https://smklog.com/developers/status does.
      security:
      - {}
      responses:
        '200':
          description: ok
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Liveness'
              example:
                ok: true
                service: smklog-quote-api
                version: 1.4.0
                time: '2026-10-12T15:04:05.000Z'
                last_estimate_race: null
components:
  schemas:
    Liveness:
      type: object
      description: 'The liveness answer: the service is up and which version is serving.'
      required:
      - ok
      - service
      - version
      - time
      properties:
        ok:
          type: boolean
          enum:
          - true
        service:
          type: string
          enum:
          - smklog-quote-api
        version:
          type: string
          description: Product version shared by the OpenAPI, the MCP server and the agent card
        time:
          type: string
          format: date-time
          description: Server time, ISO 8601
        last_estimate_race:
          type:
          - object
          - 'null'
          description: 'Diagnostic: the latest estimator race outcome, null when none is recorded'
          additionalProperties: true
  securitySchemes:
    clientCredentials:
      type: oauth2
      description: 'Optional. Every operation works without a token. A client that wants its own hourly rate-limit bucket, or the external_id create-or-update on createPaymentSession, holds OAuth 2.0 client_credentials issued by hand (registration instructions at https://smklog.com/auth.md) and sends the opaque bearer it gets from /oauth/token. Discovery: /.well-known/oauth-authorization-server.'
      flows:
        clientCredentials:
          tokenUrl: https://quote-api.smklog.com/oauth/token
          scopes:
            quote: Price parcels and prepare checkouts from a dedicated per-client rate-limit bucket
externalDocs:
  description: 'Developer portal: docs, schemas, playground, rate limits, status'
  url: https://smklog.com/developers/
x-provenance:
  method: published
  publisher: SMKlog (SMKLOG-2022 LLC)
  source: https://quote-api.smklog.com/openapi.json
  published: '2026-10-19'
x-mcp:
  transport: streamable-http
  endpoint: https://quote-api.smklog.com/mcp
  serverCard: https://quote-api.smklog.com/.well-known/mcp/server-card.json