Basket-weighted sub-indices built from real sold + ask prices across every marketplace Hoshino tracks — recomputed continuously, never invented. A missing basket shows empty; it never shows a fabricated number.
How it's built: each index is a basket of real cards (by name/category, not hand-picked winners) valued from live sold/ask comps; the index value is the basket's aggregate, and the change is run-over-run vs the prior snapshot. No basket, no number — that's a data gap, not a zero.