Data Sources
Version 2026-04-28
GradeYield uses publicly-available marketplace data and publicly-stated fee information from third-party grading companies to power its estimates. We are not affiliated with, endorsed by, or sponsored by any of the companies named below unless explicitly stated. All trademarks, service marks, and brand names are the property of their respective owners.
Market data
MySlabs coverage skews toward vintage and mainstream slabs. Modern Prizm-class rookies and variant-heavy product lines may have thin or zero MySlabs results; the calculator falls back to eBay active listings (asking, not sold) for those buckets and labels them accordingly. Pasting sold comps from a source you trust still produces the tightest estimate when our automated sources come up short.
| Source | Status |
|---|---|
| eBay active listings | Live (fallback / fills missing grades) |
| MySlabs sold comps | Live when configured (preferred per grade) |
| Manual / pasted comps | Live (preferred when you have a trusted source) |
| eBay Marketplace Insights (sold) | Pursuing approval |
| Additional paid sources | Under evaluation |
eBay
ebay.com ↗Active listing comps (not sold listings)
GradeYield queries the public eBay Browse API for current raw and graded active listings to power Comp Lookup, Value History, and the calculator. Active listings reflect ask prices, not realized sale prices — they are a useful proxy but can run higher than recent sold comps. Listings are filtered, parsed, and aggregated server-side; we do not control the underlying data and do not guarantee that any specific listing is accurate, complete, or representative of fair market value.
User-supplied sold comps
Pasted from a source you trust
GradeYield does not scrape third-party sold-comp sites. If you have access to sold prices from 130point, PSA Auction Prices Realized, eBay's sold-listings filter, or auction-house result pages, you can paste them into the Find Comps modal — GradeYield will parse the prices and label the result as “user-supplied sold comps.” Pasted comps are treated as estimates from a source you trust, not verified data.
When the autofill flow runs, MySlabs sold comps take precedence over active eBay listings on a per-grade basis. Pasting your own comps is a separate, explicit workflow — and remains the right call whenever you have realized sales from a source the automated sources don't cover.
Grading companies referenced
GradeYield references these companies' publicly-known grading scales, tier structures, and fee schedules so users can model the cost of submission. Inclusion is descriptive — it is not an endorsement and does not imply any partnership unless explicitly stated.
Grading company
PSA fees, turnaround tiers, and population data referenced inside GradeYield reflect publicly-available information at the time it was last reviewed. Always verify current numbers on PSA's official site before submitting.
BGS (Beckett Grading Services)
beckett.com/grading ↗Grading company
BGS-related fees, sub-grades, and tier behavior referenced in GradeYield reflect publicly-available information. BGS uses its own grading scales and standards which we do not replicate or predict.
SGC
gosgc.com ↗Grading company
SGC-related fees and tiers referenced in GradeYield reflect publicly-available information. SGC uses its own grading scale and standards which we do not replicate or predict.
CGC Cards
cgccards.com ↗Grading company
CGC-related fees and tiers referenced in GradeYield reflect publicly-available information. CGC uses its own grading scale and standards which we do not replicate or predict.
Accuracy and freshness
Third-party data is cached for performance and may be incomplete or out of date. Marketplace listings can be removed, edited, or mis-titled by sellers. Grading companies update their fees and tiers periodically. Always verify any number that materially affects a buy/grade/sell decision against the source directly.
Trademarks
eBay®, PSA®, Beckett® / BGS®, SGC®, and CGC® are trademarks of their respective owners. GradeYield's use of these names is purely descriptive — to identify the products, services, or marketplaces being referenced — and does not imply ownership, endorsement, or affiliation.
Questions or corrections
If you believe a number on GradeYield is materially wrong, or if you represent one of the companies above and want to discuss how your brand or data is referenced, email support@gradeyield.com. See also our disclaimer and terms.