Rest API returns the result set (top #). The pagination is a table-related feature, so if you're thinking about creating an application that uses DC RUM data, you need to develop your own pagination method. At least, this is how it used to work.
Yes change the topFilter parameter to what you would like, and then sort based on how you need. Here is a link to a helpful rest builder that should help with some of the intricacies https://github.com/barrebre/RESTfulDC