Ask HN: Domain Hosting that 1) is cheap and 2) offers a full-featured API

I have been working on lots of little side projects lately, and I've written some pretty elaborate scripts to get up-and-running as quickly as possible.

The one, obnoxious part I still have to do manually, though, is when I'm ready to launch on a unique domain I need to go a domain host, buy a domain, then manually change each of the A Records, CNames, MX Records, etc. to point to my servers, etc.

I was wondering if anyone knows of a domain host out there that lets you buy a domain and configure it entirely through an API?

Thanks so much in advance!