The EasyPost Python SDK by EasyPost communicates with the API to implement shipping services into applications such as USPS, UPS, and FedEx. Along with installation, examples demonstrate how to create an address, verify address, create parcel, create custom information form for international shipping, create shipment, and buy postage label.
Postman REST Client, a powerful HTTP client that helps developers test and develop web services, has just released version 0.9.3. (Google Chrome Packaged App) which includes brand new features including OAuth 2.0 support, user accounts, bulk uploading/importing, and a brand new API Directory.
Our API directory now includes 32 postal APIs. The newest is the Stamps.com API. The most popular, in terms of mashups, is the GeoNames API. We list 84 GeoNames mashups. Below you'll find some more stats from the directory, including the entire list of postal APIs.