cardboard.stack
The $1 sports card marketplace, built for collectors who love the hobby more than the hustle.
Why $1 cards?
The sports card market is full of auctions, price anchoring, and the anxiety of “am I overpaying?” For the vast majority of cards — the base cards, the set fillers, the common rookies — that friction isn't worth it.
cardboard.stack removes all of that. Every card is $1. If you want it, stash it. If not, swipe left. There's nothing to deliberate over. It's just collecting.
We built this for the collector who has a binder full of dupes and wants to move them without a 10-page eBay listing, and for the buyer who wants to fill set needs without spending an hour searching sold comps.
AI-powered listings
Listing cards manually is tedious. We built an AI fill system powered by Claude (Anthropic) that reads your card photos and fills in player name, year, set, card number, and sport automatically. Sellers snap a photo; the AI does the rest. You review and confirm — then publish in seconds.
Part of cardboard.*
cardboard.stack is one piece of a broader ecosystem of tools built for the modern sports card collector.
Sealed box breaks — recorded, digitized, and stored in your vault. The best way to open cards.
Community pull ratings and leaderboards. See what's hitting across the hobby.
Free, searchable checklists for every sports card set — the reference you actually need.
The $1 card marketplace. Browse, swipe, and collect — one card at a time.
What we believe
When the price is always $1, there's no information asymmetry. Buyers know what they're paying. Sellers know what to expect. The hobby gets more accessible.
Not the spreadsheets. Not the shipping math. We automate as much friction as possible so you spend more time actually collecting.
Moving a binder shouldn't require hours of manual data entry. AI-assisted listing lets hobbyists list cards the same way they'd tell a friend about them — with a photo.
Ready to start collecting?
Browse hundreds of $1 cards or sign up to list your own.