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Top 11 Essential SaaS APIs of 2025

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    SaaS APIs

    Updated 17 July 2025 |

    Application Programming Interfaces (APIs) are essential tools that enable different systems to communicate and perform tasks automatically. In eCommerce, SaaS APIs allow eCommerce software to access and manage store data such as orders, products, customers, and shipments. These APIs help perform key functions for online store owners, allowing them to optimize their workflows.

    As the eCommerce industry grows, eCommerce software need to know which SaaS APIs to integrate with to gain a competitive edge. The SaaS market is booming, with projections to reach $793.1 billion by 2029. This rapid growth is fueled by the increasing use of SaaS APIs. In this article, we’ll explore the top 11 SaaS APIs that eCommerce software and apps should integrate with to improve functionality and enhance performance.

    What are SaaS APIs?

    SaaS (Software as a Service) APIs are tools that help eCommerce software or apps access and manage store data. They make it easy for eCommerce apps to integrate with eCommerce platforms and automate key processes such as data transfer, payment processing, and inventory updates.

    List of Top 11 SaaS APIs

    BigCommerce API

    BigCommerce offers a variety of APIs for managing store data, authenticating customers, and making client-side queries for product info. These APIs ensure efficient real-time responses, keeping users updated on events in BigCommerce e-stores.

    BigCommerce REST APIs help users add new products, update existing items, modify order statuses, create coupons, and more, all via JSON format.

    WooCommerce API

    The WooCommerce API allows users to streamline operations by accessing, updating, and deleting product lists, orders, and shipments using the REST API.

    WooCommerce API offers flexible features such as filtering items, updating inventory, reserving stock, and performing many other essential tasks from one centralized data portal.

    Shopify API

    The Shopify API offers a variety of features for customizing and managing store data, from product reviews to shipments and orders. It supports both XML and JSON formats.

    Shopify API also supports HTTP commands like PUT, POST, DELETE, enabling developers to integrate various services with Shopify stores efficiently.

    Ecwid API

    Due to the growing popularity of Ecwid, many eCommerce software vendors are integrating their systems with its API.

    Ecwid API is secure and uses oAuth2 authentication. It provides benefits for managing regular store data and offers the ability to customize the storefront and add new interfaces to the control panel.

    Lightspeed API

    Lightspeed API gives users access to all operation endpoints, utilizing the OAuth2 protocol for authentication. It supports HTTP requests and allows users to add, delete, or edit records using XML or JSON formats.

    Magento API

    Magento's API supports both JSON and XML formats, making it versatile for users to manage sales, customers, and deliveries.

    In addition to REST, Magento offers SOAP APIs, allowing comprehensive communication across various operational categories. Communication is mainly through XML-RPC clients due to the XML format.

    Salesforce Commerce Cloud API

    Salesforce Commerce Cloud API is a REST API designed for the B2C commerce platform, offering seamless store function integration. It provides access to three main types of APIs: Shop API, Data API, and Meta API.

    Shift4Shop (formerly 3dcart)

    Shift4Shop API offers REST and OAuth authentication methods. It supports 50 requests at a rate of 2 requests per second, making it scalable and easy to integrate with various eCommerce platforms.

    Squarespace Commerce API

    Squarespace Commerce API is versatile, allowing easy access to inventory, orders, and customer data.

    X-Cart API

    The X-Cart API enables seamless data exchange with the X-Cart platform using basic HTTP methods and JSON format.

    API2Cart API

    API2Cart API supports integration with over 60 popular shopping platforms, such as Shopify, Magento, WooCommerce, and more. The unified API reduces the cost and complexity of single point-to-point connections.

    API2Cart API is a unique unified API that simplifies the integration process across multiple platforms. It supports popular platforms like Shopify, WooCommerce, Ecwid, OpenCart, 3dcart, and more. It even integrates with online marketplaces like Amazon, eBay, Etsy, and Walmart.

    Test API2Cart's unified API functionality for 14 days for free. Simply book a demo now and register your account with the help of our specialist.

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