Beeminder – Flexible Self Control
https://www.beeminder.com/

Beeminder plots your progress along a path to your goal and takes your money if you go off track. Beeminder is the only self-tracking system that uses monetary incentives to help you stick to your goals. If you just want self-tracking you have a lot of choices and if you just want commitment devices you have more and more options as well. Beeminder combines self-tracking and commitment contracts: keep all your data points on a Yellow Brick Road to your goal or we take your money. The combination is powerful. They call it flexible self-control. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.