Better Cardmarket Charts - by Matras by Matras

This extension replaces the default chart on Cardmarket product pages with bigger, more detailed price and availability charts. Works for Magic, Yu-Gi-Oh!, Pokémon, One Piece, Lorcana and Riftbound.

What does it show?

📈 1-day, 7-day and 30-day average price with one value per day. No more gaps, even for cards nobody has looked at in months.

📦 Number of available items over time

🔢 Sales estimate: how many copies were probably sold on a given Day. This is an estimate based on how the available count changes, not an official number.

⏱ 30 days, 90 days, 1 year or everything

🌙 Dark mode, following the Cardmarket setting

Optional features

✅ Community data sharing (on by default): sends the number of available items of the product pages you open, together with the product ID. Nothing else.
✅ Background sampling (off by default): additionally collects the available count for cards in the background while you browse, at most once a minute.
Both can be switched on or off in the popup at any time.

Privacy

No account needed
No tracking, no cookies, no user ID
The only thing ever sent is the product ID and a number of available items
Prices are not read from your browser

Not affiliated with Cardmarket.