StumbleUpon is website discovery app and Su.pr is its link shortening tool. The Su.pr API provides functionality for URL shortening, expansion, and posting to authorized services, such as Facebook. The API also includes a parameter to switch versions of the API without interrupting production code. It is a RESTful API and returns JSON and XML responses.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.