I personally use https://www.inwx.de/en https://www.inwx.de/en They have an API, provide nameservers, are comparatively cheap (at least for the TLDs I own) an

I personally use https://www.inwx.de/en https://www.inwx.de/en They have an API, provide nameservers, are comparatively cheap (at least for the TLDs I own) and have a nice minimalistic interface targeted at professional users