Right now the API allows you to get a list of people that are on a list but not the other way around. In other words it would be great to be able to get a list of the lists that a person has been added to rather than having to get every single list on the nation to look for a person.
Makes sense! Thanks for the suggestion. It's something we will consider but does not have a timeline at the moment.
Depending on what you are doing, tags could also be a great way to segment your supporters and has more robust API functionality.