Cardmarket Chart Extension — Matras

This extension replaces the default Cardmarket chart with improved price and availability charts that become more accurate and more useful as the community grows.

What does it show?

📈 7-day average price (AVG7) for smoother price trends

📦 Available item count over time

⏱️ Multiple time ranges: 30 days, 1 year, max

Historical data on Cardmarket is limited.
This extension improves charts by collecting anonymized, aggregated market data contributed by users.

➡️ The more users participate, the better and more complete the charts become for everyone.

Optional features (recommended)

✅ Community data sharing – helps build better historical charts

✅ Random fetch – automatically collects live market data in the background while browsing

Both features are opt-in and can be enabled or disabled at any time.

Privacy-friendly by design

-No accounts required
-No tracking
-No personal data collected
-Only product-related numeric data (prices and availability)