I manually update the DNS settings at the registrar for my domains, such as

https://domains.google.com/registrar

What are people using to automate updates to DNS settings? which registrars have an API ?

Specifically I need to manually update :

• TXT field for the DKIM setting

• TXT field for spf

  @ TXT 1m "v=spf1 ip4:100.22.22.100 include:blah.com -all"

• A record everytime I change external IP

To run my own DNS host servers seems like overkill. Ideally I would just make some secure REST call to perform programmatic updates.