SMKlog Agent API

openapi: 3.2.0
info:
  title: SMKlog Quote Agent API
  version: 1.4.0
  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.'
  termsOfService: https://smklog.com/terms
  contact:
    name: SMKlog
    email: info@smklog.com
    url: https://smklog.com/api
servers:
- url: https://quote-api.smklog.com
tags:
- name: Agent
paths:
  /agent/checkout-session:
    post:
      operationId: createPaymentSession
      summary: Create a payment session for one parcel label (MPP intent "session")
      description: 'Prices the shipment live, anchors the amount to one service, and returns a handoff URL opening the SMKlog checkout prefilled with the shipment. The human confirms the contents certification and the carrier-adjustment consent there and pays on Stripe hosted checkout. This operation never charges: the agent prepares, the human pays.'
      x-payment-info:
        intent: session
        method: stripe
        amount: '0'
        currency: USD
        description: Creating the session is free. The label amount is set by the live quote in the response and paid by the human on Stripe hosted checkout behind the site consent gates; no autonomous charge is possible through this API.
        offers:
        - intent: session
          method: stripe
          amount: null
          currency: USD
          description: Amount is set by the live quote returned in the response; null per the draft means dynamic pricing.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: []
              properties:
                quote_id:
                  type: string
                  description: quote_id from a previous get_parcel_quote call, valid 15 minutes. When given, the shipment comes from that quote and product, from_zip, to_zip, to_country and quantity are ignored.
                product:
                  type: string
                  description: Required unless quote_id is given.
                from_zip:
                  type: string
                  description: 5-digit US ZIP. Required unless quote_id is given.
                to_zip:
                  type: string
                  description: 5-digit US ZIP, or the destination country's own postal code. Required unless quote_id is given.
                to_country:
                  type: string
                  enum:
                  - US
                  - CA
                  - GB
                  - DE
                  - AU
                  default: US
                quantity:
                  type: integer
                  minimum: 1
                  default: 1
                  description: Identical parcels. Default 1; more than 1 returns no session because a person prices it.
                service:
                  type: string
                  description: Optional service to anchor the amount, matched as a case-insensitive fragment of the display name; cheapest when omitted or unmatched.
      responses:
        '200':
          description: 'The session: intent, method, amount, currency, service, handoff_url, session_id, note. Keep session_id for getCheckoutStatus.'
        '422':
          description: session_failed — unpriceable, restricted, or routed to human freight review.
        '429':
          description: rate_limited — shares the quote bucket.
      tags:
      - Agent
  /agent/checkout-session/{session_id}:
    get:
      operationId: getCheckoutStatus
      summary: Read where a payment session stands
      description: 'The stage of the checkout a payment session led to: awaiting_checkout, checkout_started, paid, label_ready (with the tracking number), delivered or refunded. Reads SMKlog order records only, no carrier call. Sessions live 30 days; an unknown or expired id answers 404 session_not_found. The answer never carries names, addresses or emails.'
      parameters:
      - name: session_id
        in: path
        required: true
        schema:
          type: string
          pattern: ^as_[A-Za-z0-9-]{8,80}$
        description: The session_id returned by createPaymentSession.
      responses:
        '200':
          description: session_id, status, created_at, expires_at, amount, currency, service, checkout (order_id, paid, label_ready, carrier, service, tracking_number, tracking_status, estimated_delivery, delivered_at) and next.
        '404':
          description: session_not_found — unknown, malformed or expired session_id.
        '429':
          description: rate_limited — 60 checks an hour per client.
      tags:
      - Agent
x-mcp:
  transport: streamable-http
  endpoint: https://quote-api.smklog.com/mcp
  serverCard: https://quote-api.smklog.com/.well-known/mcp/server-card.json