Amazon Marketplace SP API: A Guide for Developers

Updated 19 June 2024 |

For a software developer, it opens a whole new world of opportunities for you to leverage Amazon’s marketplace for your applications and services. Amazon Marketplace SP API can be viewed as a strong entry point that allows accessing the vast potential of one of the global leaders in the eCommerce industry. If your objective is to automate inventory updates, process orders, or extract more data, it’s important to understand how the Amazon Marketplace SP API works. This ultimate guide will provide you with all the information and tips that you will need to make the best of Amazon Marketplace through API.

Overview of Amazon Marketplace SP API

The Amazon Marketplace Selling Partner (SP) API describes the interaction between third-party sellers and developers and Amazon’s massive marketplace. This API suite is aimed to simplify, accelerate and amplify different eCommerce processes by providing a direct connection to the powerful Amazon system. It is a newer version of the earlier APIs used for Amazon, known as MWS or Marketplace Web Service APIs, but is more versatile, secure, and efficient.


Technical Aspects of Amazon Marketplace SP API

  1. RESTful Architecture: The Amazon SP API relies on a RESTful architecture, which is more in tune with the current web standards than the MWS, which is based on SOAP. This architecture makes API more compatible with modern applications and makes interactions with it simpler, scalable, and more flexible.
  2. OAuth 2.0 Authorization: Security is very important when it comes to online transactions, especially within the context of eCommerce. To keep the API secure, the SP API complies with OAuth 2.0 for authorization. It provides a good and solid foundation for accessing resources. This means that third-party applications need permission from Amazon sellers to manage the sellers’ accounts; hence data security is maintained.
  3. JSON Data Format: Unlike the MWS, which utilizes the XML format to encode its data, the SP API uses JSON for data transmission. It is not only easy to read and write but also compatible with most modern programming languages, thus simplifying and lowering the overhead of data handling.
  4. API Endpoint Coverage: The Amazon SP API encompasses a wide set of endpoint functions crucial to a marketplace's functioning.
  5. Rate Limits and Quotas: To maintain stability and fairness, the SP API employs a rate limit. These are based on a “leaky bucket” algorithm meaning that while there are bursts of requests are allowed, the total number of requests cannot exceed a certain amount within a specific time. Application developers are required to build their applications to work within these limits and should include retry mechanisms and follow exponential backoff protocols.
  6. API Sandbox Environment: Amazon offers a testing environment for the SP API, that allows developers to test applications on sample data without interfering with live data. This is very useful in checking and confirming integration before deploying to the live environment, thus reducing the occurrence of errors and downtime.

Getting Started with Amazon Marketplace SP API


Starting as a software developer in the Amazon Marketplace SP API entails getting acquainted with the basics of implementing a secure connection with the Amazon systems. The first one is to sign up for an Amazon developer account if you do not have one already. After creating your account, you will have to go through the process of linking your application to Amazon Seller Central and get the credentials which include the client ID and the client secret. This entails identifying the characteristics of your application and the kind of data you wish to retrieve. Following registration, you will also have to deal with the OAuth 2. 0 authorization flow to make it possible for your application to safely access data belonging to sellers on Amazon. This authorization process is important as it ensures that it meets the required security measures that Amazon has set for sellers’ data.

After you have received all your credentials and managed the authorization, you can start to look through the various endpoints provided by the SP API. Begin with the Amazon SP API sandbox environment because it enables the development and testing of the application on a non-live database. Here, you simulate API calls to understand how the API responds to different requests. To help with this, Amazon offers extensive reference materials explaining each endpoint and the input and output formats that should be expected as well as the error codes that may be received. Also, it is crucial to know the rate limits and use the API most effectively and efficiently to avoid any interferences while integrating. With these first steps, you are ready to make the most of the Amazon Marketplace SP API for your e-commerce solutions and benefit the Amazon sellers through your application.

Integrating Amazon Marketplace SP API via Specialized Third-Party Tools

Integration with Amazon Marketplace can be complex especially for developers who are new with Amazon as it has many requisites and has strict security policies. The integration process involves understanding OAuth authentication mechanisms, proper manipulation of JSON data, and strict compliance with rate limits and APIs. Moreover, this integration requires constant checking and modification to adhere to the latest specifications and security measures set by Amazon.

That is where a specialized third-party tool, such as API2Cart, can be of help. API2Cart makes integration with Amazon Marketplace SP API easier by providing a single API that connects your software to over 40 eCommerce platforms and marketplaces, including Amazon. With API2Cart, it becomes easy for developers to avoid the time-consuming process of direct API integration and instead, concentrate on creating additional features for their applications. API2Cart is responsible for all the complex processes connected with working with Amazon’s SP API, including authentication, security, and data synchronization.


You can test API2Cart for free and see how it can help you integrate with Amazon with minimum effort. All you need to do is book a quick call with one of the API2Cart's managers, and they will create an account on the service. Schedule a demo today and start your journey towards streamlined Amazon Marketplace SP API integration.


To sum up, it can be stated that integrating with Amazon Marketplace SP API can help boost your eCommerce software activities by leveraging one of the most popular online marketplaces worldwide. However, direct integration is a bit challenging due to the intricacies and the technicalities involved. This can be done using a third-party service such as API2Cart which can help you save time to work on what is really important – expansion of your business and improvements to your products.

Related Articles

How to Develop Amazon Shopping Cart API Integration
Amazon Product API: How To Get All Needed Product Data
What is an API Integration Platform and How to Choose It?