How do I choose between monthly and hourly billing?
There is no difference between monthly and hourly billing. All droplets are billed hourly, up until a monthly cap. We have estimated that each month has about 672 hours (28 days). If you use your server for less than 672 hours during the month, you will be billed for each hour that you used it. If you use your server for more than 672 hours that month, you will be billed at the monthly cost, which is no greater than 672 hours.
刚看了他们faq。是按小时算的。新建一个就已扣了1小时的费用