Datasetpublic

rrhagentbiz/pokemon-card-centering-measurements

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… See the full description on the dataset page: https://huggingface.co/datasets/rrhagentbiz/pokemon-card-centering-measurements.

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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.

Data: `gemsnipe-card-centering-measurements.csv` — one row per measured listing photo, 320 rows, 302 distinct cards. Measurement window: 2026-03-07 to 2026-07-15.

Column notes — please read before citing

column	meaning
`ebay_item_id`	the public eBay listing item id the photo was measured from.
`left_right_pct_left_share`	the card's left border as a percent of total left+right border (50.0 = perfectly centered on that axis).
`top_bottom_pct_top_share`	the card's top border as a percent of total top+bottom border.
`psa10_strict_pass`	true if the worse side of both axes is within PSA's Gem Mint 10 window (55/45 or better).
`psa9_relaxed_pass`	true if within the Mint 9 window (60/40 or better).

Sampling caveat, stated plainly. These are cards a human buyer already pulled up as gem-mint candidates before measuring — not a random draw from all Pokémon card listings on eBay. That means the 48.1% PSA-10-window pass rate is an optimistic ceiling for hand-picked candidates, not an eBay-wide average; a random listing would very likely clear the window less often. Rows come from a CV pipeline (corner detection → perspective correction → border measurement) that only reports genuine measurements — placeholder/failed detections are excluded at the source, never included and never loosened to grow the count.

Source and license

Compiled and maintained by [GemSnipe](https://gemsnipe.com) (gemsnipe.com) — a free centering + zoom tool for grading Pokémon card listing photos by eye, so a buyer can call a PSA 10 candidate before they bid. The full measured-centering study (band breakdowns, worst-axis analysis) is published live at https://gemsnipe.com/centering-study/. Licensed CC-BY-4.0.