How to query ALL User Profiles?

Hello,

I am looking for a way to call a web service that will get and return All User Profiles stored in the User Profile Manager for SharePoint 2013? To make it more specific, I am not getting a information from a specific user but would like to gather information from ALL User Profiles. 

What can I do so I can do the query? I am looking at using this within a workflow, particularly, Nintex Workflows. I am looking at no code if possible..

Thanks!