Listing criteria and how we collect data

Collection rules

• We only collect sell and buyback prices published on each shop's own website. Nothing is estimated, filled in or copied from other sites.
• We check each site's robots.txt first and skip any page it disallows. Sites whose robots.txt cannot be fetched (access refused) are not collected.
• Once a day (around 06:00 JST), with at least 5 seconds between requests.
• Order is by price only (sell: lowest first, buyback: highest first). Ads or partnerships never change the order or the "highest"/"lowest" labels.

What is and isn't listed

• Single cards are listed only for the 13 sets we track (M6A, M6, M5, M4, M3, M2A, M2, M1L, M1S, SV11B, SV11W, SV8A, SV2A); cards from other sets are dropped.
• Rows with no price or a price of ¥0 are dropped.
• Where a shop grades condition, we show the "Grade A" (状態A) price, or the first listed price if there is none; sealed boxes use the "New" (新品) price. Grading standards differ by shop.
• Items a shop marks as sold out are still shown, labelled "Sold out", as a price reference.
• Sell and buyback prices are shown separately. "Buyback ratio" is the highest buyback price divided by the lowest sell price.
• No card images are shown.
• If the total number of rows on a day is unusually low (under 1,900), the update is skipped and the previous day's site stays up.
• Pages for cards that drop out of the data are kept as "not currently listed" pages instead of being deleted.

Shops not currently collected

• Card Rush's buyback list (cardrush.media) refuses access from our collection server, so it is not collected (its sell prices are listed).

Shops and today's results

Open data

Latest data: prices.csv (shop, type, sell/buy, set, number, card name, rarity, condition, price, stock, source URL, fetch time; names are in Japanese. The first line is a comment with the update time).