Grading Assistant — Centering Analysis

Overview

The Grading Assistant helps you decide whether a card is worth sending in for professional grading. Phase 1 focuses on centering — the single most measurable grading sub-component — giving you:

• An AI-powered centering score (0–100) calibrated against PSA standards
• Annotated overlay images for both front and back showing exact border measurements
• A toggle to attach those overlays to the card's eBay listing so buyers can see the centering at a glance

Access it from the Grading Assistant link in the left sidebar.

How it works

1. Pick a card from your inventory. Only cards with status Ready for Listing or Ready — High Value are eligible. Listed and sold cards are hidden so you don't accidentally analyze something that's already up for sale.
2. Click "Run analysis." The Grading Assistant downloads the front and back images, sends them to Gemini Vision, and measures the four borders on each side.
3. Review the overlays. You'll see both sides side-by-side with:
   • Color-coded guide lines along each border (green = PSA 10 range, yellow = PSA 9 range, red = worse)
   • Measurement ratios (e.g. "48/52" for left/right)
   • A combined centering score and PSA band estimate
4. Optionally include the overlays in your eBay listing. Toggle the "Include centering images in eBay listing" switch. The next time you publish this card to eBay, the overlay images are uploaded as additional listing photos alongside the regular front/back shots.

Scoring

The centering score is derived from the worst-side percentage across both axes:

• 100 = perfect 50/50 on both axes
• ≥ 80 = PSA 10 eligible (55/45 or better) — green badge
• ≥ 60 = PSA 9 eligible (60/40 or better) — yellow badge
• < 60 = off-center for gem mint — red badge

Note that centering is only one of four PSA sub-grades (the others are corners, edges, and surface). A card can have perfect centering and still grade a PSA 8 if it has corner wear. The Grading Assistant will expand to cover all four sub-grades in a future release.

When to re-run analysis

Re-run the analysis when:

• You swap the card's front/back images (via Card Detail → Swap Images)
• You re-upload higher-resolution scans
• You're preparing to publish the card and want the latest overlay in the listing

Stored analyses are kept until you re-run them or delete the card.

eBay listing integration

When you enable "Include centering images in eBay listing," the overlay images are inserted after the regular front/back photos but before any branding image. The primary listing thumbnail (the first image eBay shows in search) is preserved — it's still your front photo.

eBay caps listings at 24 photos total. Between the two main photos, two centering overlays, and optional branding, you're well within the limit.

Pricing and limits

Grading Assistant is available on all paid plans (Collector and above). Free-tier users can see a preview of the centering score but cannot save overlays or attach them to listings. Each analysis uses one Gemini Vision call per side and is included in your normal AI usage.

Phase 2 (coming soon)

Future releases will extend the Grading Assistant to assess:

• Corners — sharpness of each of the four corners
• Edges — whitening, chipping, or dents on each edge
• Surface — scratches, print defects, staining
• Estimated grade range — e.g. "PSA 8–9" based on a holistic analysis
• Should I grade this? — a recommendation that weighs the estimated grade against the card's value and typical grading cost

The centering data you capture today rolls forward into the Phase 2 condition report.