CatchBack (YC W26) CatchBack is a trading card platform that combines the excitement of pack opening with technological tooling. You purchase digital packs, open them to reveal cards backed by physical cards stored in our secure vault. You can trade, sell, or request physical delivery of your cards at any time. Users can also create custom packs where they pick their exact hits and odds, and buy and sell cards in our marketplace with just a $1 charge for completed sales.