Turn card market gaps into sourcing opportunities.
CardSentry helps trading-card resellers track live eBay listings, market baselines, and Whatnot activity to surface potential arbitrage opportunities across cards, slabs, and sealed product.
Built for resellers, vendors, and serious buyers sourcing Pokémon, MTG, sports cards, slabs, singles, and sealed product.
See what it surfaces
Sample data shown for product preview. Marketplace and seller names are shown for sample preview purposes only — CardSentry is not affiliated with these sellers or marketplaces.
Built to find market gaps.
CardSentry helps resellers compare live listings against market baselines, estimate potential profit, and prioritize the opportunities worth checking first.
Estimate potential profit
Compare buy price, market baseline, fees, and shipping before you click.
Spot under-market listings
Surface live listings and auctions that appear below recent market expectations.
Move faster on sourcing
Get cleaner signals across eBay, Whatnot activity, and imported card price baselines.
eBay Live Deals
Find fresh BINs and auctions priced below market.
Market Baselines
Compare listings against TCG-style pricing, manual baselines, and imported price sheets.
Whatnot Radar
Know when watched sellers and high-signal shows go live.
Coming soon: advanced sourcing tools
TCGplayer Intelligence
Track raw singles, market lows, condition spreads, and pricing gaps across the cards resellers watch most.
Live Auction Scoring
Spot auctions with strong price gaps, seller signals, and ending-time urgency before they close.
Whatnot Auction Radar
Track high-signal live shows, seller activity, and auction opportunities in one focused feed.
Retail Sealed Restock Radar
Monitor sealed product drops and restocks across major online and in-store retailers.
Portfolio Repricing
Upload inventory and get hold, list, reprice, or liquidate signals based on market movement.
Discord Deal Rooms
Route filtered opportunities into private Discord channels by game, product type, ROI, or watchlist.
Get in early
We're onboarding early users in small batches to keep signals high-quality.
Request Access