Method. One set, one index. The universe is every card in the set; the basket is the cards that trade as ungraded singles — at least 6 clean single-card sold comps in the trailing 30 days to enter, 4 to stay. Price-weighted on PriceCharting's dated ungraded sold list (blended eBay + TCGplayer), never asks. Caps: no card above 25% and positions above 5% never past 50% together (the Select Sector SPDR 5/50 rule) — a weight marked * is capped, and every cap is a weight in the divisor math, so applying one never moves the level. Level = Σ(sold mark × weight) ÷ divisor 9.1696; entries, exits and cap changes are logged divisor adjustments; reconstitution quarterly (first Monday of Jan/Apr/Jul/Oct, announced the Monday before). 21 of 92 cards are in the universe but not the basket. n30 is a liquidity gate, never a volume figure (the source caps its table at 60 rows). The 25th-anniversary set (2021): 25 main cards, the Classic Collection reprints (which keep their original numbers, so Charizard is #4) and the Celebrations promos PriceCharting files with the set. Reverse holo, Prize Pack and stamped prints are separate items and are not in this index. Bid buttons are live eBay auctions on the exact card (verified title, soonest close with bids first, refreshed every 15 minutes) — bids, not marks. An index is a measurement, not a call. How prices work · every ticker.