[manveru]

They have a really good and simple API for the Cloud hosting at https://docs.hetzner.cloud/ and there's also https://www.terraform.io/docs/providers/hcloud/index.html I've been using this to setup some servers with little effort.

For dedicated hosting there is https://robot.your-server.de/doc/webservice/en.html

I just wish they had NixOS images so I'd save a few minutes of initial deploy time.