SPORTSCARD SOCIALMEDIA
Show the cards you collect. Talk to people who share your hobby.
DEN is a social network for sports card collectors. Display your collection, browse other people's cards, and share stories and information with collectors around the world.
MADE FOR SPORTS CARD COLLECTORS
We wanted a social network where card collectors could show each other their collections and ask the questions on their minds.
We want to connect collectors in Japan and abroad. Whether you're looking for a favorite player's card or asking about grading and storage, we want this to be a place where you can find someone to talk to.
01 / YOUR COLLECTION, YOUR DISPLAY
Display your favorite cards in VAULT, the collection case on your personal page. Arrange them as you would in a case at home, and share your collection with collectors worldwide.
YOUR PAGE, YOUR COLLECTION
Feature your YouTube pack openings and collection videos near the top of your page. Tell people about the cards and genres you collect in your profile, and add links to X, Instagram, YouTube and other social accounts.
Below that is a collection case for your cards. The card from your latest video and the collection you're proud of can all be shown on one page.
02 / A SHELF THAT CONNECTS
Go from a card in your collection case to a trade or a listing. Reuse its photos and information to prepare a listing on TRADE BASE STORE.
Browse each other's shelves and choose cards you'd like to exchange. We're building a way to send a trade proposal whenever you're ready.
Choose the cards you want to list from VAULT. In the store, browse everyone's listings or select a seller to see only their shelf.
These are actual preview screens. Trading and listings are being prepared for public release.
TRADE / BALANCE METER
Find a card in someone's public collection and make a proposal.
Choose the cards you offer and the cards you'd like in return.
The value you assign to a card for trading is not shown to the other person. The central balance meter helps you consider the balance between both sets of cards.
Prices you choose to publish, such as a selling price in the store, are visible to other users. This does not make your private trade value public.
People value cards differently. The meter is a guide to possible combinations, not a market appraisal or a guarantee that a trade will happen.
We plan to let users mark each card as available or unavailable for trade. Only available cards will be eligible for proposals. The design does not allow proposals involving cash or items other than cards.
The recipient decides whether to accept. Look for a combination that works for both of you.
Development for real trades is ongoing. The parties arrange the exchange and shipping themselves; TRADE BASE does not guarantee completion or delivery. A possible role for TRADE BASE is still under consideration. Screens and specifications may change.
03 / FIND YOUR PEOPLE
Share your latest find or ask about storage and centering. Topic-based conversations let you exchange messages and photos.
CREATOR HUB brings together user profiles and collections. If someone catches your interest, take a look at their shelf too.
04 / BEYOND LANGUAGE
The site supports nine languages, so you can use DEN in the language that suits you.
Translate a message written in your own language into English with one tap.
Write in your language → Share in English
Today's card is a favorite autograph card! What cards do you have on display?
Help with entering card details, too.
AI suggests details; you check and correct them.05 / LESS INPUT, MORE COLLECTING
Crop the card from your photo and adjust its angle and margins. Check how it will look on the shelf before saving.
AI reads details such as the card name, player, brand, year and product to help with registration. Review what it finds instead of entering everything from scratch.
Depending on the photo and the results, you may need to adjust the four corners or correct the details. The original photo is retained, and you review the result before saving.
06 / ONLINE MEETS REAL
We plan to connect DEN with our card shop, TRADE BASE in Akihabara, and SPORTSCARD CONNECT, the events we organize.
We plan to open TRADE BASE in Akihabara several times a week. Listening to what visitors need, we aim to create a place to see cards in person and discuss trading and sales.
Opening days and hours have yet to be decided.
Exhibit the cards you own or introduce your collection. We're preparing ways to make it easier to participate in our SPORTSCARD CONNECT events.
We also want to create opportunities to bring collections shown on DEN to the venue and meet people you've been talking with online.
TRADE BASE / AKIHABARA
gran+ Akihabara II, 1F
2-15-12 Sotokanda, Chiyoda-ku, Tokyo 101-0021, Japan
The interior during SPORTSCARD CONNECT #3. These photos do not show current opening hours or displays. Event record ↗
07 / SPORTSCARD CONNECT #4
SPORTSCARD CONNECT #4 took place at Kanda Myoujin Hall on May 5, 2026. Thank you to everyone who joined us.
Actual photos from the fourth event. Select a photo to enlarge it.
Showing a card while chatting, or taking a closer look at a new find. See more from the day on the official event page.
See the fourth event recap ↗Highlights of the fourth event from TRADE BASE CHANNEL.
This video is in Japanese.
PLANNED FEATURE / ARTICLES
We plan to create a place where anyone can write columns and articles for readers beyond the people in their conversations.
How you found a special card, the joy of collecting, and what your collection means to you. We want to bring those stories together as articles people can return to.
GROWING WITH COLLECTORS
DEN is still in development. Tell us what's difficult to use or what features you'd like to see.
We'll keep improving it with your feedback in mind.
In the future, we want DEN to be useful not just for collectors, but also for sports card manufacturers and card shops beyond TRADE BASE.
Alongside the web version, we will also develop apps.
Try the DEN preview ↗08 / COMING UP
Built from the feedback of our beta testers. We’ll release these one by one.
Start a thread by citing a card from your vault, or leave a comment on any single card. Likes, saves and notifications give you a reason to come back.
Original DEN stickers that say it without words. Characters inspired by sports and positions, plus the characters from our own game.
A raise-and-battle mini game to play between card hunts. Collect, train, fight. One more thing to enjoy in a collector’s day.