Patchew is an open source CI project to automate testing of patches submitted as emails on mailing lists. Currently Patchew has a simple API, but it is complicated to use it because it is not REST-like and it exposes low-level details of the patchew database schema. The project aims at replacing it with a new REST API.
The proposal submitted: https://docs.google.com/document/d/1G7Wm7WxDP0lRVOLJflhIsdDAq6yc84snmIy8EJSc8fA/edit?usp=sharing
Each patch has commit message which explains the functionality of the commit. The main goal of converting legacy endpoint to REST was achieved during the summer. However additional features like adding OAuth and adding new parameter were not done. That is something I plan to cover post GSoC. The new APIs are hosted at http://patchew.org/api/v1/