How to programmatically get a list of all Lemmy instances?

I'm working on a Python script to find a snappy Lemmy instance, as the one I was using (not dbzer0) has recently slowed down to about 5 seconds per page load. I have a rough version of the script, but I need to fetch a list of available Lemmy instances through their API.

Could anyone guide me on how to access the Lemmy API to retrieve a list of instances?