Sports Card Data Platform
Population reports, sales history, grading insights, and market analytics for sports cards. Track gem rates, price trends, and historical data.
Population Reports
Track grading populations across PSA, BGS, SGC, and CGC with daily volume updates
Gem Rates
Calculate gem rates (10s / total) with proper adjustments for BGS 9.5+ grades
Sales History
View historical sales data with price trends and market analytics
About Possum
Possum combines features from GemRate and SportsCardsPro into a single platform with comprehensive historical data and proper source attribution.
All raw data is stored append-only with source and timestamp, allowing for accurate historical tracking and data provenance.
Current Status: Milestone 1 - Foundation phase with PSA population data support. Additional sources coming soon.