You are here API - Libraries is an e-mail marketing service that offers monitoring of e-mail receivers. The company aims to provide consumer insights with the goal to create targeted marketing campaigns. Developers can integrate to any online application through a REST API that requires access key. The main benefit of this API about e-mail marketing is to keep contacts in sync. In the site, developers can review tutorials. They can also access a code library available in Java, PHP, Ruby, Python, Objective-C, Windows 8, and .NET.