The line between what constitutes a platform versus an application is getting more blurry with each passing day. Applications are increasingly coming complete with SDKs that provide developers with access to APIs through which they can extend the application. Case in point is Decisyon, which recently launched a Decisyon 360 collaborative decision making (CDM) environment that makes extensive use of RESTful APIs and Web Services that are exposed via an SDK.
The Streak API integrates its client relationship management (CRM) platform into other applications like MailChimps and Wufoo. The API's webpage reveals that it requires an API key and uses HTTP Basic Auth. The request format supports Create, retrieve, update, and delete (CRUD) with response in JSON. The purpose of the API is to manage CRM relationships through your application.