There are specs. Notably the folks at RadioPublic put one out a few years ago that would standardize the process, but it never panned out. At Pinecast you get a

There are specs. Notably the folks at RadioPublic put one out a few years ago that would standardize the process, but it never panned out. At Pinecast you get a unique feed URL that's tied to a paid subscription, but that's a bit hard to use, unfortunately.