We currently have a statistics API for AS2 and AS3 and a shared content API for AS3. Our Documentation site has the instructions for implementing the various APIs for your game on Kongregate.
Once you’ve implemented the APIs that are required for the bonus at the time of upload (currently the Statistics & Challenges API), your game is locked in with the 10% bonus. New games must comply with the current API requirements at the time of upload to be eligible the bonus. The API bonus will be applied when your game reaches 50 score submissions from players.