The Leading USPSAPI

Unrivaled Uptimes.
Unique Features.
Easy Implementation.

What the numbers show

Over
ONE BILLION
USPS
shipments
Integrates
with over
200
e‑commerce
apps
Helps
deliver
Half
of first‑class
packages*

*Includes Stamps.com family of companies

Trusted by eCommerce and Shipping Leaders

Create your first shipping label!

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Quick and Easy Access to USPS Services

Endicia Label Server (ELS) offers the most comprehensive USPS integration available in a simple and seamless API. ELS helps hundreds of thousands of online businesses and warehouses save time and money.

Rates

Supports all USPS rating models and provides rate comparisons for single or multiple mail classes.

Print Labels

Easily buy and print live USPS postage. Automatically chooses the correct labels and customs forms for each shipment.

Real-Time Tracking

Get the most recent tracking status for all of your USPS packages, instantly.

Looking for a multi-carrier shipping API?

Then take a look at ShipEngine. With ShipEngine you can easily integrate with a RESTful API to ship with the top global carriers in minutes. ShipEngine gives you access to powerful core features such as multi-carrier rate comparison and label generation, domestic and international address validation, label batching — all with one partner API.