Endicia ELS joins ShipStation API

We are bringing Endicia Label Server (ELS) under the ShipStation API platform family. This change brings new features and functionality to you without requiring any changes to your existing API code or workflow.

Yes, your existing XML-based Endicia API code will continue to work without any changes. This means you can keep printing labels, calculating rates, and tracking shipments just like you always have.

No, you do not need to rebuild or re-integrate your existing setup. Your current integration will be preserved and will continue to function as-is. The purpose of this migration is to give you access to new features within ShipStation API.

With your new ShipStation account, you’ll gain access to the ShipStation API Enterprise package which gives you multi-carrier shipping, our latest analytics capabilities, enterprise-grade reliability and speed, and easy tools to build customer-facing checkout experiences.

Learn more about ShipStation API here

To use new ShipStation API functionality, you can add new JSON-based endpoints alongside your existing Endicia XML code. You’ll use a new ShipStation API key, which you can manage in the new ShipStation API Portal. You can use both the old and new code together in the same development environment.

The existing Endicia API portal will be retired. You will now manage all your API keys, carrier settings, and usage through the new ShipStation API Portal. 

Through the ShipStation API login, you’ll see a link to the Endicia Web Client on the left side navigation. Through Endicia Web Client you’ll be able to manage refunds or print one-off labels. 

You will have unlimited access to ShipStation Enterprise package functionality through the end of February. Your pricing will not change unless you choose to upgrade to a higher-tier ShipStation plan to activate additional capabilities after February. If you only use your existing Endicia functionality, you will remain on your current pricing plan.

We will be providing proactive support to help with this transition. Once you log in to the new portal, you’ll find in-app guidance, documentation, and technical support to help you get comfortable with the new platform and unlock any new features you’d like to use.

Support for customers

Support for partners

• There are two important changes happening: 
  • You’re getting a new ShipStation API Partner account. The best part? your setup won’t skip a beat. You’ll keep everything you rely on today— no code changes, no workflow disruptions—while unlocking additional capabilities for you and your customers. 
  • While the Endicia web client is becoming Stamps.com, your customers will still be able to use their existing Endicia UI username and password, and access existing configurations such as contacts, store connections, presets, and more without any additional action required.
    • Effective January 31, 2026, when your customers log in to Endicia, they will be redirected to Stamps.com, which has the same functionality—just a different look. On this date, referring customers to Stamps.com will require you to use a new link and promo code.
    • We will email your customers starting December 3, 2025 to let them know of this upcoming change.
    • On this date, referring new customers to Stamps.com will require you to use a new link and promo code. We will share your new code with you in early January.

Effective January 31, 2026, when your customers log in to Endicia, they will be redirected to Stamps.com, which is part of the Auctane family of brands and has the same (and more) functionality as Endicia – just a different look. 

Your users will be able to use their existing Endicia UI username and password, and access existing configurations such as contacts, store connections, presets, and more without any additional action required.

We encourage you to start updating branding references for both Endicia ELS (now ShipStation API) and Endicia Web Client (now Stamps.com).
👉 View Branding Guidelines

No, Your integration with the Endicia Label Server API, now part of ShipStation API, will continue to work as it does today. You can use your new, free Shipstation API sandbox account to explore the new features available to you on the ShipStation API platform. 

Similarly, Stamps.com offers your customers the same (and more) functionality as Endicia, and even allows them to use the same credentials to log in.

ShipStation API gives partners everything they love about Endicia Label Server, plus much more. Built for modern commerce, the ShipStation API goes beyond USPS to power hundreds of domestic and international carriers in a single integration. Learn more: www.shipengine.com 

With the ShipStation Partner API you can:

• Expand beyond USPS instantly – Connect to 200+ carriers worldwide, compare live rates, and print labels for multiple services through one easy endpoint
• Integrate faster with REST + JSON – Our modern REST architecture can replace SOAP/XML complexity with clean, intuitive calls, extensive documentation, and robust SDKs. 
  • To use new ShipStation API functionality, you can add new JSON-based endpoints alongside your existing Endicia XML code. You’ll use a new ShipStation API key, which you can manage in the new ShipStation API Portal. You can use both the old and new code together in the same development environment.
• Enhance delivery accuracy – Validate U.S. and international addresses in real time to reduce failed deliveries and surcharges
• Automate everything – Schedule pickups, create manifests, add insurance, and trigger proactive tracking updates all via API
• Stay future-ready – As new carriers and services launch, they’re automatically available to you without rewriting your integration

For 30 years, Stamps.com has made it easy to print discounted stamps, labels, and Certified Mail® from USPS®, UPS®, and other top carriers in under 2 minutes. This trusted platform helps businesses save time, money, and headaches with free pickups, tracking, and tools to manage everything they send and spend from a single place online.

Stamps.com offers your customers:

• Additional UIs including desktop and mobile app
• More services and new carrier options like FedEx
• Easier refunds that do away with manual processes
• Advanced reporting and analytics
• Flexible payment options
• A better store experience
• And much more – in one simple app

As a partner, you will have access to our ShipStation Partner API. Your API keys will be sent directly to you in early October. 

• Partner-specific documentation:  Partner API docs

Is there a Getting Started guide? Getting Started

Your new ShipStation API Partner keys will be sent to you in early October.

Moving forward, you can refer customers to Stamps.com, which is part of the Auctane family of brands and has the same (and more) functionality as Endicia – just a different look. Referring customers will require you to use a new link and promo code. We will send your new link and promo code in January 2026.