allow one free withdrawal per month

In continuing my adventure with balance with interest. Look like interest showing up daily consistently and when I tried to withdraw got the following messages. Notice the second screen shot, look like I get one free withdrawal per month, I think this is pretty good. However I have not done the actual withdrawal yet, just an attempt to see if it work. There is no transaction fees, but are there other fees other than transaction fees?

Well refer to this link: