Looks great but these services have a tendency to come and go. Bad actors just end up hammering it. But I've been using icanhazip.com for years and it's still going strong.
If the software behind the service is available and looks like it'll be easily usable for years because it has few to no dependancies that are likely to deprecated, I might actually commit the effort to memory and use it for all similar demands, similar to how I keep track of specific CLI *nix tools which I can rest assured, even if there are no updates and potential security issues, most are going to be usable at some future date in a pinch.