Methodology & data
What Card Signal can show, and what it cannot.
Card markets are noisy. Card Signal organizes available information and explains how closely a listing matches the search, but it does not turn incomplete data into certainty.
Marketplace listing sources
Live search results come from approved marketplace APIs. Card Signal displays the title, image, price, shipping information, condition, and destination link supplied by the provider. Marketplace availability and fields can change between searches.
Active listings are asking prices. They show current supply and seller expectations; they do not prove what a card has sold for.
How listing matches are evaluated
Card Signal compares details in the search with details present in each listing. Signals can include player or character, year, product, card number, parallel or variant, grading company, grade, autograph, memorabilia, and serial-number terms.
The match label describes how much of that identity is supported by the listing text. It is a research aid, not an authentication or condition opinion. Listings with missing or ambiguous details may be separated from stronger matches.
Prices, shipping, and comparable sales
- Listing price is the item price reported by the marketplace.
- Free shipping is shown when the marketplace explicitly reports it.
- Shipping location needed means a final amount depends on destination or information the marketplace has not supplied.
- Total asking price is item price plus known shipping; tax and other location-dependent costs may still apply.
- Completed-sale context is shown only when Card Signal has an approved source with the necessary commercial rights.
When recent completed-sale information is unavailable, Card Signal says so rather than presenting active listings as sold comps.
Decision tools and estimates
Fee, grading, print-run, and score tools use the values entered by the user and the assumptions displayed in the tool. Results are estimates for comparison and planning. Actual fees, grades, market prices, taxes, and sale outcomes can differ.
Checklists and release research
Card Signal points collectors to original manufacturer, league, brand, and other approved sources when available. We do not claim ownership of third-party checklists, card images, marketplace listings, or brand data.
Accounts and collection data
Collection information belongs to the account that created it. Access controls are enforced in the database, and account-only pages are excluded from public search indexing. Review the Privacy Policy for more information.
A stronger research routine
- Identify the exact card before comparing prices.
- Inspect the strongest matches and exclude obvious variants or grades that do not belong.
- Compare total cost, including known shipping.
- Use completed-sale context when an approved source is available.
- Open the marketplace listing and verify photos, seller terms, condition, and final costs before deciding.