MarketButler by ButlerStack

See every Cardmarket seller's matches for all your wantlists — in one click.

MarketButler is a privacy-first companion for Cardmarket. Instead of opening each of your
wantlists one by one to check what a seller has, click one button on a seller's page and
MarketButler fetches and merges all your wantlist-filtered matches into a single table,
with a new "Wantlist" column showing which list each card came from.

Features

• One-click aggregation — a "Find all wantlist matches" button above a seller's offer table
merges matches from every wantlist into one sorted view.
• Wantlist column — every matched card shows which list it came from.
• Full pagination — every page of a seller's offers is aggregated, not just page one.
• Cart-aware highlighting — sellers already in your cart are highlighted on product pages.
• Duplicate detection — a "highlight duplicates" toggle on the cart page badges cards you're
buying from multiple sellers.
• Mobile remove-all — restores the "remove all items from this seller" button on small screens.
• Wantlist control — enable or disable individual wantlists from the popup.

Privacy

MarketButler runs only on www.cardmarket.com. Everything it reads is processed locally in
your browser and stored only in local extension storage. It makes no network requests except
to Cardmarket itself, and it sends no data to the developer or any third party. There is no
telemetry, no analytics, and no account of its own.

Supported

Chrome (MV3, desktop), Microsoft Edge (MV3, desktop), and Firefox 140+ (desktop and android mobile).