Official ConstantContact .NET SDK. It provides installation, documentation, and usage. To install, download and build the CTCTWrapper project. Next, place developers' credentials. To use, include namespaces, obtain an access token, create a service object, and use the SDK. Authored by Brian Vysocky.
Here is a follow up interview with Raj Kadam, CEO of Viralheat API whom we have interviewed on the Sentiment Analysis API here. In 2012, Viralheat had about 30 billion calls over all its' APIs. Viralheat just announced a new API called Human Intent API.