We first brought news of Postmaster a few months ago. Since then, the Postmaster API has gained new customers and Postmaster has raised significant capital from eager investors. Along with its recent success, Postmaster announced its first major shipping partner to use the Postmaster API for its services. Lone Star Overnight (LSO) white labels the Postmaster portal for access to its entire suite of features.
Adding shipping and posting functionalities to your applications may be necessary for your what you're trying to achieve, but it may not always be a quick and easy process. EasyPost is a posting and shipping service specifically designed for applications, saving developers some very valuable development time. The EasyPost API makes it possible for developers to access this functionality and easily integrate it with other applications.