Pokémon Card Centering Measurements — 320 eBay Listings, PSA-Window Pass Rates (2026)

Measured front-centering data for 320 Pokémon card eBay listing photos across 302 distinct cards, computer-vision-measured (corner detection + perspective correction, not estimated): left/right and top/bottom border share for each. 48.1% clear PSA's Gem Mint 10 centering window (worst side within 55/45); 89.7% clear the Mint 9 window (60/40). Sampled from cards a buyer had already flagged as promising candidates, so this is an optimistic ceiling, not an eBay-wide average — stated explicitly so nobody cites it as the latter. Sampling caveat: these are cards a human buyer already flagged as gem-mint candidates before measuring, not a random draw from all listings — the pass rate is an optimistic ceiling for hand-picked candidates, not an eBay-wide average. Compiled and maintained by GemSnipe (gemsnipe.com) — a free centering + zoom tool for Pokémon card listing photos. Full study: https://gemsnipe.com/centering-study/.