I'm the maintainer of LiteRumble [1], which is the official continual rankings of all Robocode bots. The Robocode install includes a client, which (offline) runs the battles that then get uploaded to the LiteRumble server, similar to SETI/Folding@home.

If you need anything on the Literumble which would help with an integration, don't hesitate the let me know. Discussion about developement of all Robocode related things happens on the RoboWiki [2].

1. http://literumble.appspot.com 2. http://robowiki.net