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.
Look at how Dynamic DNS supported. Does it require full access to the account-- dangerous-- by using your login credentials or an API token with full read/write access? Or does it over a very limited scope access that gives the Dynamic DNS tool precisely the access it needs to update a single DNS record-- much safer! The latter is what CloudDNS does.