---
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.
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[Back to Developer changelog](https://shopify.dev/changelog)

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)