I use this service for my business accounts, it's easy to set up an account in just minutes with all that you need when starting out included (no more having tons oof paperwork).
There are no additional charges if your balance goes below $100 or above than 100k - sometimes there can be fees but not always so great! If anyone has any questions don't hesitate as they have amazing customer support who will help solve anything within seconds!! We love how simple yet powerful our system looks like after we installed countup onto each clients website / phone number/ email address etc.. It also makes reconciling bank deposits easier since everything happens at once without needing multiple checks from different banks which would delay things by weeks even months now.