There are two separate costs: one is the domain registration and the other one is the hosted DNS solution. With the hosted DNS solution you get access to stuff

There are two separate costs: one is the domain registration and the other one is the hosted DNS solution. With the hosted DNS solution you get access to stuff like the one click setups I mentioned earlier, API access, domain forwarding, vanity name servers and who knows what else. Keep in mind you can use their DNS service even if you don't register your domains with them.