Cloudfrag is a fresh concept offering gamers, communities and clans server rental, charging only for the uptime of the server. In effect, this means if you’re not playing, you’re not paying. As simple as that.
In their own words:
Having your own game server is cool. No waiting in lobbies, no laggy public servers. But why should you pay for your server even when you are not using it?
With Cloudfrag, you don’t have to. You get all the benefits of running your own server, but you only pay for the time the server is actually running.