USPS Shipping API

With the ShipEngine platform and USPS API Integration, shipping for your business is easier and more convenient than ever with rate comparison, pricing, tracking, proof of shipment, and more! To print USPS postage online, you need to have your own USPS postage account with, which includes deep discounted Priority Mail and Priority Mail Express postage rates. Luckily, we include a account for FREE when you sign-up with ShipEngine, so there's no extra cost to you!

Features We Support

Access to all Domestic USPS Mail Classes
First Class Mail, Media Mail, Parcel Post, Priority Mail, and Priority Mail Express
Access to all International USPS Mail Classes
First Class Mail International, Priority Mail International, and Priority Mail Express International
Flat Rate Pricing
Quick, easy, and convenient!
Regional Rate Pricing
Save big on short-distance shipping!
Real-time Rate Calculation
Easily compare rates for various USPS services
USPS SCAN Form Support
Provides quick tracking information and proof of shipment