This document summarizes Spira API and how it provides version stability for developers. It discusses SOAP vs REST approaches and how Inflectra takes a REST approach with retrofitting old APIs so that they continue working with new versions. Examples are provided of how test case and template APIs continued working through multiple versions. The document also provides guidance on getting started with the Spira API including authentication methods and an example walkthrough of making a new task. Finally, some potential API usage ideas are listed like allowing users to self-add to products and analyzing test and incident data.