Amazon’s Selling Partner API (SP-API) is the backbone of modern Amazon integrations, powering inventory synchronization, pricing updates, order management, and analytics across thousands of ecommerce tools.
However, starting January 31, 2026, Amazon will tighten SP-API usage limits and introduce mandatory fees for all third-party developers, including an annual subscription and monthly charges based on GET API call volume. As a result, sellers and software providers are facing rising operational costs directly tied to API usage.
To control these costs, many tools are forced to reduce API call frequency or limit real-time synchronization. Either way, merchants lose — through outdated data or higher monthly fees. This is especially painful for sellers with large catalogs or multiple Amazon marketplaces. Poor data freshness can lead to overselling, lost Buy Box opportunities, and decisions based on outdated analytics, while higher fees create long-term margin pressure for SMBs and growing brands.
There is a way to avoid these trade-offs without cutting corners. By using Store Manager for Magento and registering as your own Amazon private developer, you can eliminate third-party SP-API usage fees entirely.
When you register as a developer in Amazon Seller Central, API calls are made on your behalf — not through a SaaS provider. This means no third-party overhead, no per-call fees, and full use of Amazon’s native limits.
Because Store Manager is a downloadable desktop application, not a cloud-based platform, you connect SP-API using your own credentials, maintain real-time inventory, pricing, and order sync, and keep full control over update frequency — with no hidden SP-API costs passed on to you.
Learn how to register as a private developer, create an app, and connect your Magento store to Amazon via Store Manager to keep your data fresh without increasing costs — https://amazon-integration-doc.emagicone.com/2-quick-start-guide/developer.
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