The EasyPost Java SDK by EasyPost communicates with the API to access shipping data that can be useful to integrate USPS, UPS, and FedEx into web services. It requires Java 1.5+ and Google Gson to start implementation.
Postmaster, a technology company that specializes in small package logistics optimization, has just announced the addition of a new Box and Bin Packing feature to the Postmaster API. Earlier this year, Postmaster launched a beta version of the Postmaster API which helps businesses integrate and optimize the shipping process when using carriers Fedex, UPS, and USPS.
The Saia API helps this first class less-than-a-truckload (LTL) carrier deliver by giving developers access to tracking information inside their applications. Rate quotes and pick up scheduling are also accessible. The API uses SOAP and XML, and is implemented using Microsoft's .NET Framework.