Services are billed on monthly basis except for SSL certificates, which are billed yearly. Some addons, like VCL purchases from third party sellers, are billed once only. When you decide to load balance across multiple nodes, the total billed equals the total number of nodes times the monthly cost for one Cachoid. For example, if you sign up for the Medium plan ($15/mo) and choose to load balancer across two nodes for your domain , the total monthly recurring  is going to be $30 (2x $15).