Not yet, but it makes sense to have the functionality for expanding shortcuts available through an API. The change in April was so that the website cannot be used to obfuscate URLs for normal web browsers.

I think basically the API would still be to make a GET (or POST) request and get back the resolved URL. The main change would be that it's not a HTTP redirect anymore but in the body.

If you have a better idea for the API, I'm interested in hearing it :)