Effective date: July 12, 2026

Cardmarket Cantrip is an independent, unofficial browser extension. It is not
affiliated with, endorsed by, or sponsored by Cardmarket.


Cardmarket Cantrip has no account system or developer-operated backend. It does
not send information to the developer, sell data, or share data with third parties
other than direct requests to Cardmarket described below. It has no analytics,
telemetry, advertising, remote code, remote backup, or Cardmarket API integration.

To provide its features, the extension processes Cardmarket pages in your browser
and makes requests only to Cardmarket as described below.


The extension processes the following information only in your browser to provide
its features:

• Filter-profile names, selections, and feature-visibility preferences that you
  create.
• Saved filtered-floor snapshots: Cardmarket product URLs, lookup criteria,
  displayed offer details (such as price, language, condition, seller type, and
  seller location), and timestamps.
• Supported Cardmarket listing markup while needed to apply filters or show a
  filtered-floor result. Full page markup is not stored.

Filter settings and snapshots are stored in extension-local browser storage. The
snapshot cache keeps at most 1,000 of its newest entries. This storage is not
accessible to the developer.


The extension runs only on pages at www.cardmarket.com. It reads supported
Cardmarket listing markup to provide its features. When you apply a filter, it
uses Cardmarket's existing filter form, which sends the selected criteria to
Cardmarket. When you request a filtered-floor result, it may make a same-origin
request to the relevant Cardmarket offer page.

These requests go directly between your browser and Cardmarket. The browser may
send your existing Cardmarket cookies to Cardmarket with them; the extension does
not read or store those cookies, credentials, or account information. It does not
send Cardmarket page content, account information, credentials, or browsing
activity to the developer or any other third party.


An exported file contains filter settings and feature-visibility preferences, not
filtered-floor snapshots. The file is created only when you explicitly export it
from Options and is not uploaded by the extension. Imported settings are read only
after you select a file and choose to import it.


Filter settings remain until you change them or remove extension data. You can
clear the saved filtered-floor cache in Options. You can also remove
extension-stored data by clearing the extension's browser storage or uninstalling
the extension. Exported settings files remain wherever you save them and are
controlled by you.


If data practices change, this policy and the extension's Store privacy
disclosures will be updated before or with the corresponding release.


For privacy questions, open an issue in the project's GitHub repository:
github.com/0xmpire/cardmarket-cantrip.