CardZ Marketcap is a daily market-cap index for graded collectible cards. Each card’s market cap is its PSA 10 reference price multiplied by its verified PSA 10 population, covering Pokémon and One Piece printings. Browse the Top 100 heatmap, per-card history and a free public JSON API — no key required. CardZ Marketcap and Cardz.Game are related sites under the CARDZ brand.