We are continuing to expand the RunSignUp API as we get more requirements from partners and from our own efforts to develop Mobile Apps.
Of note, we have our first partner (who we will announce next week) who uses the new OAuth access. This industry standard makes it easier and more secure to connect with other web services. For example, this new partner had already connected with EventBrite via OAuth, so it was simple for them to connect to RunSignUp as well.
You can check out our API at RunSignUp.com/API. If you think you need something else, please let us know!