We have two wonderful options for you:
AdultCentro Publisher if you are interested in creating an adult paysite with billing included. It's an adult content leasing platform with the content library which today contains over 100 000 scenes. The setup process wouldn't cost you anything as all our services are free. We only charge for bandwidth generated by your users. You can learn more about pricing
here.
And the second option is
ModelCentro. It's a system that allows models and studio managers to create and manage solo paysites. There are no start up costs, it works on a revenue share basis.