Close icon Two crossed lines that form an 'X'. It indicates a way to close an interaction, or dismiss a notification. Icon Sportswire/Getty Images This story is available exclusively to Insider subscribers. Become an Insider and start reading now. The rise of sports betting and NFTs like NBA Top Shot have fueled a trading boom in sports cards. Collectable is a trading platform that allows fans to buy fractional shares of valuable cards. CEO Ezra Levine breaks down how digital collectibles could boost returns and hedge inflation. For many ardent sports fans, collecting baseball cards was their favorite childhood pastime, and Ezra Levine was no exception.