I am building Ethercup and I wanted to show you how it works: https://ethercup.github.io/ .

On the website is a demo bet live right now on the Kovan test network. This bet opens today and will close in a few days. A How-to is provided on the website, but you can check out the code directly on GitHub: https://github.com/ethercup/ethercup.github.io

There's no bug-bounty program, but I'm willing to share profits (if it'll yield any) in case you can break it and point me to it. Looking forward to hearing your feedback :) Also, feel free to ask questions.

UPDATE: Betting is open now! Place your bets!