Track Your Card Portfolio Like a Pro
Cards 500 is the market intelligence platform for serious sports card collectors. Real eBay sales data, live market indices, portfolio tracking, and price trend analysis.
Cards 500 Composite Index
★ Top Sales
▲ Most Active
▲ Top Gainers
◈ Market Insights
Undervalued Cards
Recent sales below 30-day average
Momentum Cards
Consistent upward trend 7+ days
Grade Premium
PSA 10 vs raw price difference
Why Cards 500?
Real-Time eBay Price Data
Every data point comes from verified eBay completed sales. No estimates, no guesses.
Portfolio Value Tracking
Build your collection, track its value over time, and get alerts when prices move.
Market Indices by Sport
S&P 500-style market-cap weighted indices for MLB, NBA, NFL, and NHL. Updated daily.
Price History Charts
30-day, 90-day, and 1-year price trends for every tracked card.
PSA Grade Analysis
See how grading affects value. Compare PSA 10 premiums across the market.
Updated Daily
Indices recalculate daily. Constituents rebalance monthly based on trailing 90-day data.