Research # Research from the Cardinal catalog Data studies built from the Cardinal catalog's raw and graded prices. Each comes with its method and a downloadable dataset. - [**The Grading Premium Index: what a grade is worth for Pokémon cards (2026)**](https://cardinal-app.ai/research/grading-premium-index-2026/) How much a PSA 10 multiplies a card's price, and how often grading pays after fees, across price bands. --- Get Cardinal, free: [App Store](https://apps.apple.com/app/cardinal-tcg-scan-grade/id6810442266) · [Google Play](https://play.google.com/store/apps/details?id=ai.cardinal.app)