Watucomes with a 30 day free trial. When you register with a new account at Watu, you are given a demo account with some data to play with. We call it playground. You can use the playground for as 30 days. Once you are ready to start using Watu for your business, you end the trial, which graduates you to a real account. That's when we start charging. The first bill will come on the last day of the month and we'll pro-rata the days of that month depending when you graduated.
You can access the playground again any time you want, it's a good way to learn how to use Watu.