Slab Basis, where graded cards actually clear

Field notes

The tool joins Collector Crypt on Solana with Courtyard on Polygon, matching cards by set, number, form, and grade rather than comparing loose listings. Its index covers 12,541 matched cards and 3,116 realised on-chain sales; 487 subjects have prices on both chains. The homepage also breaks subjects into forms and years, with Charizard represented across seven forms from 1996 to 2026. API and pricing links are present, though their access terms are not shown in the extract.