GoDaddy really lived up to its bad reputation and recently changed their API rules. The rules are simple: either you own 10 (or 50) domains, you pay $20/month, or you don't get the API. I personally didn't get any communication, and this broke my DDNS setup. I am clearly not the only one judging from what I found online. A company this big gating an API behind such a steep price...
So I will repeat what many people said before me (being right): don't. use. GoDaddy.
desec.io can be used with any domain registrar and has an API with support for various ddns clients (ddclient, lego).
deSEC is a free DNS hosting service, designed with security in mind.
Running on open-source software and supported by SSE, deSEC is free for everyone to use.
Edit: To clarify, desec.io does not sell/rent domains. Desec has to be set as the authoritative nameserver on the registrar, then desec can manage domain records instead of the registrar (which usually also provides their own domain hosting for "free" by default).
Yes, a thousand times this. DeSEC is awesome, I moved my domain record management there. I'm usually buying domains on namecheap, and the IP allow list thing for the API was just too annoying to deal with.
What's the benefit of having a separate DNS host? I'm using porkbun and had to mess around with its dns records to configure my email hosting. Does having separate service mean I don't have to do this all over again If I switched registrars?
Yes, pretty much that. Plus some configuration might be easier with a DNS hosting. But the main benefit is decoupling domain and DNS for easier change.