---
title: >-
  Fetching carrier-calculated rates through @defer directive in Storefront
  GraphQL API - Shopify developer changelog
description: >-
  Shopify’s developer changelog documents all changes to Shopify’s platform.
  Find the latest news and learn about new platform opportunities.
source_url:
  html: >-
    https://shopify.dev/changelog/fetching-carrier-calculated-rates-through-defer-directive-in-storefront-graphql-api
  md: >-
    https://shopify.dev/changelog/fetching-carrier-calculated-rates-through-defer-directive-in-storefront-graphql-api.md
metadata:
  effectiveApiVersion: 2024-07
  affectedApi:
    - displayName: Storefront GraphQL API
      handle: storefront-graphql
  primaryTag:
    displayName: API
    handle: api
  secondaryTag:
    displayName: New
    handle: new
  indicatesActionRequired: false
  createdAt: '2024-06-06T13:24:12-04:00'
  postedAt: '2024-07-01T09:00:00-04:00'
  updatedAt: '2024-06-06T13:25:51-04:00'
  effectiveAt: '2024-07-01T09:00:00-04:00'
---

July 1, 2024

Tags:

* Storefront GraphQL API
* 2024-07

# Fetching carrier-calculated rates through `@defer` directive in Storefront GraphQL API

As of `2024-07`, `Cart#deliveryGroups` supports a new `withCarrierRates` argument, used to indicate intent to fetch carrier-calculated rates. This capability requires mandatory use of `@defer` directive, which ensures that the cart response is not blocked on calculating rates.

Test out the carrier-calculated rates on the cart today by [following our tutorial](https://shopify.dev/docs/custom-storefronts/building-with-the-storefront-api/defer#fetching-carrier-calculated-rates-for-the-cart-using-defer). We value your input, please share your [feedback on Github.](https://github.com/Shopify/storefront-api-feedback/discussions/234)