Your collection,
valued and connected.
Catalog every card you own, watch its live market value, meet other collectors, and buy, sell & trade with built-in escrow — all in one app.
Free to use · 5% flat seller fee, shown up front.
One home for every category you collect
…plus sports cards, graded slabs, coins, and more on the way.
Everything a collector needs, in one place
Cardexium replaces the spreadsheet, the price-checking tabs, the group chats and the risky cash deals with a single mobile app.
Catalog what you own
Add cards from a catalog of real sets — Magic, Pokémon, Yu-Gi-Oh!, One Piece and more — with condition, grade and your own photos. Organize them into binders.
Live market value
Every card and variant carries an up-to-date market price, so your portfolio value and each binder are always current — in the currency you choose.
Connect with collectors
Discover who owns or wants a card, follow the top collectors in your game, and message anyone in real time — share a photo or a listing right in the chat.
Buy, sell & trade with escrow
List from your collection, make and counter offers, or trade card-for-card. Stripe Connect holds funds in escrow and releases payout on delivery — safe for both sides.
See it in action
A fast, native experience built for collectors — from cataloging to checkout.
From shoebox to portfolio in minutes
Build your collection
Search the catalog, add the cards you own with condition and photos, and watch your portfolio value update automatically.
Discover & connect
Find collectors who own or want what you do, follow the best in your game, and start a conversation.
Deal with confidence
List, offer or trade. Funds sit in escrow until the card arrives — then the seller gets paid. No chargebacks, no ghosting.
Trade like a pro, protected end-to-end
Buying and selling between collectors shouldn't mean trusting a stranger with your money. Cardexium uses Stripe Connect escrow so neither side is exposed.
- Funds held in escrow until the card is delivered
- Card-for-card trades with optional cash on top
- Make, counter and accept offers in-app
- Seller payouts straight to their bank via Stripe
Example order summary
We show the platform fee and the card-processing fee separately, so you always know exactly what goes to Cardexium and what doesn't.
Start cataloging your collection today
Join collectors tracking value, connecting, and trading safely on Cardexium. Free to download.