'repository_created' webhook for oauth app

Hello, I have an oauth app and I’d like to know when a user creates a new repository on github. I’m stuck between a rock and a hard place in that it seems that you can only create webhooks _on _repos (i.e. once they have already been created) or on organisations (which isn’t relevant for me). Is there any way to be notified that a repository has been created rather than having to poll the user’s list of repos to see if one has been created?