How we estimate what your cards are worth
At HoloFoilX a value is never just a number: it has a range, a source, a date and a data quality. If the data is not enough, we show no number.
Where the numbers come from
The values are based on publicly available price data from marketplaces and data providers, for example Cardmarket and TCGplayer. Completed sales count most, market indices add to them, and current listings count only when there is nothing else.
Asking prices on eBay never go into our values. Prices are updated once a day.
Market value or reference price
“Market value” appears only with enough recent, consistent market data. A “≈ reference price” is based on few or older data points, often from a single source: it is rounded and meant for orientation.
No licensed source of completed sales is connected yet. Most values are therefore reference prices with a thin data basis.
Range and data quality
The range shows where the value probably lies according to the data. The bars next to it show the data quality: high, medium or low.
If the data is not enough, you see “Not enough market data” instead of a number – better no number than a wrong one. Such cards never count as 0 in the collection value.
Languages and graded cards
A card in another language, for example a German card, takes the Cardmarket values of the English printing as long as it has none of its own: Cardmarket combines the languages.
Graded values, for example for PSA 10, are shown only where there is data for that grade – so far for English cards.
What a value is not
Not an offer to buy or sell and not investment advice. And an estimated grade is not an official grade.