Their API works very much like the connection to dnsimple.com. There are a bunch of tools provided by developers that allow you to interactively manage your domains the same way it works on GoDaddy or any other registrar. I'm using a service called Interstate 53. The first thing you have to do is give it a domain to work with. They give you four nameservers, and you tell your registrar about those servers. I chose one of my many blork.xxx domains -- blorkmark.net.