Observium is an autodiscovering network monitoring tool which includes support for a wide range of network hardware and operating systems. HostBill integration with Observium gives you the ability you to keep track of data transfer, display selected usage graphs in admin and client interface and bill based on total transfer, averages or 95th percentile. Both customer and admin areas are equipped with number of functionalities allowing you to display bandwidth overage projection to warn the customers, and if needed, automatically add overage charge to client's invoice. Moreover, clean and powerful admin panel gives you a range of options to manage billing details and graphs from Observium.