Sports Card Marketplace
A sports-card marketplace MVP for collectors and breakers — built to answer the question collectors can never settle: who actually owns which card.
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I Brief What stood in the way
Collectors struggle to find out whether a specific card is available, who owns it, or where it was last seen. Ownership data is fragmented, there’s no direct way to make an offer, observations are scattered, and there’s little trust or moderation.
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II Build How we built it
We built a searchable card catalog with variant support and two ways to contribute — ownership and sighting submissions — backed by admin moderation. On top of that: an offer-based buying flow with escrow-style protection, dispute tools, and a points-and-leaderboard system to keep collectors active.
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III Outcome The impact
The MVP gave the client a working product to test ClueTracker with real collectors and breakers — and a clean base ready to grow into mobile and richer features.
- Stack
- Two-sided marketplace · Offers & escrow · Points & leaderboards
- Year shipped
- 2026
- Filed by
- Dev Paragon · 2026