In the “Cap-Out Details” report you can view the information about caps for the Campaigns or Buyers, check the cap limitation, number of sent and sold leads, etc.
Go to the Analytics and optimization > Buyer Analytics > Cap-Out Details. This section view campaign's or buyer's cap out details. For information on buyer or campaign, click on the“Buyer” or “Campaign” column. To view detailed information about the campaign, press the arrow icon next to the name of buyer or campaign.