Hi all,
my name is Daniel, and I am the CEO of MyArcadePlugin (WordPress Arcade Plugin). We have released a simple-to-use Scores and Achievements API for HTML5 / JS games. It allows you to send scores, medals, achievements to sites which use MyArcadePlugin. With this awesome feature game publishers will be able to run each own leader boards, tournaments and much more with your games. This API will also work with any game distributor like Gamepix, Famobi, GameDistribution.
We have released the API on GitHub and you are free to use it. It will help you to grow your audience and to make your games more attractive.
Scores and Achievements API for HTML5 games and MyArcadePlugin: MyArcadeScoresBridge on GitHub.
Let me know if you have any question about the API. 
Best regards,
Daniel