You can query the associated known lead using the Munchkin cookie as a filter value in the GET leads endpoint, and use the obtained leadid to query the visited web page activity using the activities endpoint. Also, I don't think you could query data using API for the unassociated Munchkin sessions, you could look at the anonymous webpage activity report to review/monitor the anonymous visitors though. Furthermore, I don't think you can query for all the cookies and then query all the respective associated activities in one swoop, you gotta get the lead-id of the munchkin cookie-associated lead, and then get the activities using API. Also, what's your starting point? Do you have Munchkin Ids or lead ids of people? If you have got the latter, you could directly query the activities using API instead of bringing Munchkin into the picture.