Overview

Amazon's legacy Marketplace Web Service has officially gone dark, and sellers still clinging to old integrations are now operating without a safety net. The full shutdown of MWS, completed on October 31, 2024, marks the end of a drawn-out deprecation cycle and forces every seller with custom automation to either rebuild on the Selling Partner API or adopt third-party tools from the Seller Central app store.

What Changed

• MWS is permanently offline — All remaining MWS endpoints were shut down on October 31, 2024, after a phased wind-down that began restricting access in late 2023.
• Two-stage shutdown completed — Amazon first cut off select API sections including Merchant Fulfilled Network operations in October 2023, then pulled the plug on everything else a year later.
• SP-API is the sole path forward — The Selling Partner API is now the only supported method for programmatic access to Amazon seller data and operations.
• Third-party apps offer a shortcut — Sellers who lack developer resources can replace custom MWS tools with vetted applications from the Seller Central app store.

How the Shutdown Rolled Out

Amazon gave sellers roughly two years of warning before pulling the final switch. The first phase in October 2023 blocked MWS users from accessing three specific API sections, hitting sellers who managed self-fulfilled orders, shipment tracking, and logistics data through custom integrations. The second phase in October 2024 shut down every remaining MWS endpoint without exception.

Sellers who missed both deadlines found their automated workflows — inventory syncing, order processing, bulk listing management, and financial reporting — suddenly broken. Amazon did extend its original timeline to give stragglers more runway, but that grace period is now firmly in the past.

Why Amazon Made the Switch

SP-API brings meaningful upgrades over the aging MWS framework. The most significant improvement is security: SP-API uses OAuth 2.0 authentication instead of the static access keys that MWS relied on, reducing the risk of credential theft and unauthorized access. Sellers also get more granular permission controls, so they can limit exactly what data each connected application can see and modify.