I've used https://httpstat.us/ which seems to offer the same features plus configurable delay, although when you hit it 3,000 times a second it doesn't necessarily respond with the code you ask for.
I think the proper term is "status code". Simply using the word "status" by itself is ambiguous and misleading. So any new entrants to this space could choose from a lot of domain suffixes: status.codes, statusco.de, statuscode.info, etc...