Check your PSA grade before submission — backed by 412 verified returns.

What does "checking your PSA grade before submission" mean?

Checking your PSA grade before submission means using an AI pre-grading tool to predict the most likely PSA outcome for a card before paying PSA's $25–$75 fee. SnapGradeAI is calibrated against 412 verified PSA returns — and we publish the full log on this page, including every miss. 87% of predictions match PSA within ±0.5 grade.

Methodology — how a card joins the verified log

Every entry in our verified returns log follows the same five-step process. Transparency about how we measure accuracy matters as much as the accuracy number itself.

• 1. Pre-grade timestamped — A user runs SnapGrade on the card. The prediction, sub-grades, and confidence levels are stamped with the prediction time.
• 2. PSA submission ID captured — The user ships the card to PSA and uploads their submission ID to their SnapGrade dashboard.
• 3. PSA returns — PSA grades, slabs, and ships the card. Typical turnaround: 30–120 days.
• 4. Slab cert logged — The user uploads the PSA cert number, which is publicly verifiable on PSA's site.
• 5. Entry published — We log: predicted grade, predicted sub-grades, actual PSA grade, miss delta, days-to-return. The entry becomes part of the public log on this page.

Accuracy breakdown (all 412 verified returns)

Snapshot as of May 2026. Updated quarterly as new PSA returns are logged.

• 358 / 412 (87%) within ±0.5 of the final PSA grade
• 396 / 412 (96%) within ±1.0
• 54 (13%) misses by more than 0.5
• 16 (4%) misses by more than 1.0
• 0 charged credits where confidence was below 70% (auto-refunded)

Accuracy by cohort

Pokémon · 218 cards · 89% within ±0.5 · 97% within ±1.0

Sports cards · 74 cards · 86% within ±0.5 · 95% within ±1.0

Magic: The Gathering · 51 cards · 84% within ±0.5 · 94% within ±1.0

Yu-Gi-Oh! · 32 cards · 88% within ±0.5 · 97% within ±1.0

One Piece TCG · 21 cards · 86% within ±0.5 · 95% within ±1.0

Lorcana · 16 cards · 81% within ±0.5 · 94% within ±1.0

Vintage (pre-2003) · 38 cards · 79% within ±0.5 · 89% within ±1.0 — our hardest cohort due to unusual aging signatures

Modern (post-2018) · 264 cards · 90% within ±0.5 · 98% within ±1.0

Where we're wrong (and why we publish it)

16 of 412 cards (4%) missed by more than 1.0 grade. We publish them because hidden misses break the trust this whole tool depends on.

• 12 of 16 are vintage cards (pre-2003) with unusual aging signatures under-represented in our training set.
• 3 of 16 are modern cards with print defects PSA flagged that the model under-weighted.
• 1 of 16 was a foreign-language print run our model wasn't set-tuned for at the time.

What we're doing about it: targeted training-set augmentation for pre-2003 holos (planned Q3 2026), and per-set tuning for under-supported language editions.

Sample of recent verified returns

Charizard Holo 1st Ed. · Pokémon Base · Predicted 9.5 · PSA returned 10 · Δ −0.5 (near-match)

Black Lotus Beta · MTG Beta · Predicted 8.5 · PSA returned 8.5 · Exact match

Blue-Eyes White Dragon LOB · Yu-Gi-Oh! · Predicted 10 · PSA returned 10 · Exact match

Pikachu Illustrator Promo · Pokémon Promo · Predicted 9.0 · PSA returned 9.0 · Exact match

Liliana of the Veil · MTG Innistrad · Predicted 8.0 · PSA returned 7.5 · Δ +0.5 (near-match)

2003 LeBron James Topps RC · Sports · Predicted 9.5 · PSA returned 9.5 · Exact match

The full 412-row filterable table is available in your SnapGrade dashboard after signup, filterable by game, set, predicted-grade range, and miss size.

Why this page exists

Most AI grading tools claim "95% accuracy" with no public log to back it. We disagree with that approach. The 412-card verified set is the entire point — without it, an AI prediction is a confident-looking guess. With it, you can decide whether to trust the tool on your specific card. See also: AI Pokémon card grading vs PSA — how close is the match?.