Set a goal to track a certain number of hours each day, week, or month for a certain project or tag on Toggl. If you don't, Beeminder will take your money.

Track your time on Toggl like normal. Toggl will automatically report it to Beeminder.

Beeminder will warn you if you're in the danger zone. As long as your dots don't cross the bright red line, your money is safe!
(Details on our blog)