The Zacks Data C# SDK by HubertJ access the financial analysis, earnings, and trends features of the API. Resources include a tutorial that explains data validation before a request. Download references available. To know more about how the API works, visit https://www.quandl.com/help/api
The PayChannel API makes it possible to incorporate its credit card processing gateway into your software platform. Public information on the API is not available, though it does provide 8 payment features.
ZenPayroll, Inc., a cloud-based payroll service provider, has just announced the release of the brand new ZenPayroll API which allows developers to connect HR, Finance, scheduling and other back office applications with the ZenPayroll platform.
GoodGuide is a service that we have been using as a family for a while. It attempts to analyze a product holistically & scientifically to produce a simple 1 to 10 rating of its "goodness." I am personally satisfied to see that the GoodGuide API will share this data with the world.