Our API directory now includes 199 email APIs. The newest is the Uptime Robot API. The most popular, in terms of mashups, is the SendGrid API. We list 10 SendGrid mashups. Below you'll find some more stats from the directory, including the entire list of email APIs.
Need a CRM package that fits a small business requiring simplicity on a cost structure that makes sense? Stride could be it. The API documentation and the information on github points out this is a RESTful API, with JSON and XML responses. JSON is preferred. OAuth2 is used for authentication. The Stride API joins three other sales tracking APIs in our directory.