Nope, they don't. They keep a running total of how much server you've "used" (like, I've currently used $2.95 for the last few days of several droplets) and bi

Nope, they don't. They keep a running total of how much server you've "used" (like, I've currently used $2.95 for the last few days of several droplets) and bill you at the end of the month.