How can I get a list of the files in a public folder without authentication?

Unfortunately, I don't have a good solution to offer here. Listing the contents of a folder via a shared link using the API requires an access token, and would be subject to that potential rate limiting. The API doesn't offer an alternative way to anonymously programmatically list the contents of a folder from a shared link, like one can on the web UI, but I'll pass this along as a feature request. I can't promise if or when that might be implemented though.