I am the founder of WhoAPI, a small company that operates a few APIs that we built. Whois API, Screenshot API, Blacklist API, Domain Score API, and a few others.
Using these same APIs we've built Webmaster.ninja. This software as a service notifies website owners and operators when their website is not working. It also does domain monitoring really well.
In my spare time I read a lot of books, and I write white papers, ebooks, guides, articles, interviews and so on.