Cost basis per card
Each card stores the price you paid (or the value at the time of acquisition for trades and pulls). The portfolio screen sums those into a total cost basis, then subtracts the current market value to show realized exposure card-by-card and across the whole collection.
The breakdown separates raw cards from graded cards, so you can see at a glance how much of your collection's value is locked behind grading premiums versus sitting in raw form.