Calculate checkout rates

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Calculate the shipping rates a buyer should see at checkout for the given destination and cart, using the delivery options defined on the configuration. The response contains one rate per delivery option that produced a price, and each rate carries its own quote_id that can be retrieved later with Get a checkout rate quote.

{
  "ship_to": {
    "address_type": "residential",
    "address_line1": "525 S Winchester Blvd",
    "address_line2": "Suite 200",
    "city_locality": "San Jose",
    "state_province": "CA",
    "postal_code": "95128",
    "country_code": "US"
  },
  "items": [
    {
      "name": "T-Shirt",
      "quantity": 2,
      "sku": "SKU-1234",
      "price": 19.99,
      "weight": {
        "value": 23
      },
      "dimensions": {
        "length": 2,
        "width": 2,
        "height": 1
      }
    }
  ],
  "currency": "USD"
}

{
  "config_id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "rates": [
    {
      "quote_id": "f1a2b3c4-d5e6-7890-abcd-ef1234567890",
      "option_id": 100001,
      "option_name": "Standard Shipping",
      "type": "live_rate",
      "carrier_id": "se-1234567",
      "service_code": "usps_priority_mail",
      "final_amount": 10.69,
      "currency": "USD",
      "estimated_delivery_days": 2,
      "estimated_delivery_date": "2026-06-26T00:00:00Z"
    }
  ],
  "created_at": "2026-06-24T10:00:00Z"
}