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use cases

Save Money on Shipping Save Money on Shipping Manage Your Inventory Manage Your Inventory Centralize Your Operations Centralize Your Operations Automate your workflow Automate your workflow

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Core Features

Rate Shopping Rate Shopping Buy and Print Labels Buy and Print Labels Access Integrations Access Integrations Order Management Order Management Inventory Management Inventory Management Warehouse Management Warehouse Management

Effortless returns and exchanges

Turn returns into revenue with effortless exchanges, a branded customer portal, and centralized tools that cut manual work and unify returns across every channel.

Featured Integrations

UPS UPS Shopify Shopify USPS USPS Amazon Amazon Squarespace Squarespace

Integrations

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Resources

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Help Center

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New features that fuel growth

Power growth at every stage of fulfillment. Our enhanced tools for inventory, returns, and analytics help you scale smarter—from order to outcome.

API Documentation

Build faster, smarter workflows with our robust APIs—designed to connect your end-to-end  shipping process, from order to doorstep.

ShipStation API

High-performing, standalone API that allows you to integrate once to access 200+ carriers, automate fulfillment, manage returns, and grow with confidence.

Documentation Full API Reference
View Endicia API (Legacy) Documentation
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API Status
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Libraries & SDKs
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Setup Carriers
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Calculate Costs
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ShipStation Companion API

Consolidate orders, print discounted labels, track shipments, and sync inventory in real time–all while plugging directly into your shipping UI.

Over 100,000 marketplaces, ERPs, and fulfillment systems rely on the Companion API to connect seamlessly with ShipStation and power their shipping.

V1 Documentation V2 Documentation
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