API Integration is a leading provider of Internet-based postage services.'s online postage service enables small businesses, enterprises, and online retailers to print U.S. Postal Service-approved postage with just a computer, printer, and Internet connection, right from their home or office. We target our services to small businesses and home offices, and currently have PC Postage partnerships with Avery, Microsoft, HP, the U.S. Postal Service, and others.

You can't print USPS shipping labels without access to USPS postage. That's why we give all of our customers a free account! That's right… FREE! Plus, as a new customer you receive $100 to spend on cool shipping equipment at the store. That's $50 towards a professional scale and $50 towards select thermal printers. So what can you do with Glad you asked. Here's a list of all the powerful API integration features that you can access through ShipEngine.

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