Txt Mobster provides a two-way API enabling users to send or receive SMS mobile text messages to a single contact or multiple contact groups or keyword contact lists. The API allows developers to integrate Txt Mobster into their applications. A wide variety of programming such as managing keyword lists, activating new keywords, and billing management is available. The API is a common straight-forward URL HTTP post. API documentation is available once users register.
Coverage: Not explicitly stated but covers all major carriers.