An API endpoint and/or UI that people can drop their podcast link into, returning a Podlink URL.

In addition to how it currently works (search by name), this could also facilitate a 'search by URL' feature in which Podlink automatically retrieves the title from the user-provided external (e.g. Apple/Spotify) podcast url and then inserts it into its existing search function.

This would allow e.g. for a Chromecast extension which lets people share a Podlink URL from any single-platform podcast page that they happen to be visiting at that time (e.g. Spotify).

A native "convert any podcast link to a universal URL" app could similarly utilize the OS share function on iOS and Android to create a universal Podlink URL from any single-platform URL that the user retrieves from their smartphone podcast app of choice.

It would effectively function as an intermediate layer on the source/push side (in addition to the retrieving side that you already cover) of the single-platform podcast URLs that we don't want. :)