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.

What MarketButler does

• One-click aggregation — a "Find all wantlist matches" button appears above a seller's
  offer table; one click merges matches from every wantlist into one view.
• Wantlist column — every matched card shows its source wantlist.
• Full pagination — every page of a seller's offers is aggregated, not just page one.
• Cart-aware highlighting — on product and card pages, sellers already in your cart are
  highlighted; on the cart page, a "highlight duplicates" toggle badges cards you're buying
  from multiple sellers so you can spot duplicates before checkout.
• Wantlist control — the popup lets you enable/disable individual wantlists, so you only
  check the lists you care about.
• Remove from your wantlists — matched rows get a red trash button, the same icon
  Cardmarket uses on a wantlist: in the single-wantlist and aggregated views it removes the
  card from that row's wantlist, on a seller's full inventory from every wantlist that wants
  it.
• Wantlist badges — a small "WL" badge marks cards that are on your wantlists, on card
  pages, seller pages, the homepage "Best Sellers" widget and the trends pages. Hovering
  shows the wantlists, clicking opens one.
• Always up to date — adding or removing cards on Cardmarket is picked up right away; no
  manual refresh needed. A Settings option (off by default) can limit badges to the wantlists
  selected in the popup.
• Hide recurring Cardmarket notices — the Reminders tab in Settings hides the notices you
  don't need: the shopping-cart reminder, the unpaid-orders notice, the phishing warning, the
  request-success confirmation and the evaluation reminder.
• Optional MTG Reserved List badges — marks cards on the Magic: The Gathering Reserved
  List with a golden "RL" badge (off by default, works offline).
• Display "Remove all items" — the button that removes all of a seller's items from your
  cart stays visible on small display sizes.

Settings

Three tabs: Wantlists (which lists to check), Features (aggregation button, cart
highlighting, duplicate highlighting, wantlist badges, reserved-list badges and badge scope)
and Reminders (which Cardmarket notices to hide).

Privacy by design

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 142+ (desktop and Android).