You can price your individually or in bulk on Mascot, either via the Collection screen or when you go to list your items for sale. You can do this in numerous ways: 1) Make sure the "Listing Price" column is checked off. Simply enter in your desired listing prices directly in "Collection".
You can also price your assets when you go to list them for sale. Simply select the items you would like to list ---> Manage Listings ---> this will take you to the Sell screen. You can enter in your listing price(s) directly here, as well.
Mascot has partnered with leading pricing data providers, such as CardHedger and GPAnalysis, to offer recent sales data on your collectibles. This will help you price your items more intelligently, based on current market value.