STAMPS.COM ANNOUNCES NEW INTEGRATION WITH X-CART SHOPPING CART SOFTWARE

Enables users of popular shopping cart software to easily print pre-paid USPS shipping labels

LOS ANGELES-September 22, 2010-Stamps.com® (Nasdaq:STMP), the leading provider of USPS® postage online and shipping software to approximately 400,000 customers, today announced its new integration with X-Cart, an e-commerce software solution that is used by thousands of online merchants in more than 100 countries around the world.

Stamps.com’s integration with X-Cart is offered at no additional charge to new and existing Stamps.com customers. It allows X-Cart users to batch print up to 1,000 pre-paid USPS shipping labels for all mail classes — including Media Mail® and First Class International Mail®. It also automatically posts order status details such as tracking number, ship date and mail class back to the X-Cart store. Additional Stamps.com features include hidden postage, insurance discounts and thermal printer support.

X-Cart is a PCI-DSS compatible shopping cart software with open source code and flexible template system for easy front-end modifications. It is SEO-friendly and offers tons of e-commerce features including the ability to manage and run an unlimited number of products and categories.

“Online merchants need convenient shopping cart systems that are easy to set up, administer and maintain, and they need shipping solutions that facilitate fast and cost-effective deliveries,” said Stamps.com president and CEO Ken McBride. “The integration between X-Cart and Stamps.com offers online merchants a convenient e-commerce solution coupled with the speed and efficiency of Stamps.com’s shipping software.”

About Stamps.com

Stamps.com (Nasdaq:STMP) is a leading provider of Internet-based postage services. Stamps.com’s service enables small businesses, high-volume shippers, enterprise shippers, and consumers to print U.S. Postal Service-approved postage with just a PC, printer and Internet connection, right from their home or office. The Company targets its services to small businesses and home offices, and currently has PC Postage partnerships with Avery Dennison, Microsoft, HP, Office Depot, USPS and others.

Stamps.com, the Stamps.com logo and PhotoStamps are trademarks or registered trademarks of Stamps.com Inc. All other brands and names are property of their respective owners.

Stamps.com Investor Contact:
Stamps.com Investor Relations
(310) 482-5830
http://investor.stamps.com

Press Contact:
Dena Cook
Brew Media Relations
(310) 526-8576
[email protected]