No. Once a server is deployed it cannot move between pay monthly and pay hourly. You will need to deploy a new server if you would like to change billing type.
All pay-per-hour servers have a monthly cap, so if you are using an hourly server it will never charge more than the monthly amount in each calendar month.
If you have deployed a server on pay monthly by mistake and would like to use pay hourly, please contact our team via Discord or a new support ticket and we will resolve the issue for you - please note we are only able to do this in the first hour the server is running.