Every extra channel multiplies your reach and your risk. One Near Mint copy listed on your storefront, CardNexus, Cardmarket, eBay, TCGplayer, Cardtrader and Mana Pool is seven ways to sell the card and six ways to cancel on a customer. This page is about the mechanics that stop that happening: when stock is decremented, what the platform does when two channels buy inside the same second, and how drift gets caught before a buyer notices.
Real-time is a marketing word, so here is the honest version: updates sync via webhooks, usually within seconds — allow up to 15 minutes. Each marketplace also has its own rules for withdrawing a listing, which is why conflicts need a defined resolution rather than a promise of speed.
The shared record is reduced the moment the order is accepted. Every other channel's available quantity is recalculated from that record, which keeps the window where two channels both believe they hold the last copy as short as the connectors allow.
When two marketplaces take the last copy inside the same window, your channel priority decides which order stands. The lower-priority order is cancelled automatically and the buyer refunded, instead of staff discovering the clash at packing.
Comparisons between your stock record and each channel's live listings catch quantities that drifted after a failed push, a rejected listing or an API outage, and raise them for staff rather than leaving phantom stock on sale.
Fee structures differ, so margins should too. Each channel carries its own margin and fee buffer while your own storefront keeps independent pricing, and a repricing run publishes the right number to each.
Decide which channel wins a conflict, and keep specific products, conditions or whole catalogues off channels where they do not belong — graded slabs off a channel that cannot express a grade, for instance.
Rejected listings, expired credentials and failed pushes surface as work to do. A sync that quietly stopped last Tuesday is how a shop ends up selling cards it posted out a week ago.
One stock record, a defined winner when two channels clash, and reconciliation that catches what the APIs drop.
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+ 2% of TCG singles and sealed sales across POS, Shopify and marketplaces — comics, board games, accessories, drinks, toys and other non-TCG items are excluded
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Related topics, running on the same platform underneath.
Listing preparation and order reconciliation while direct sync is on the roadmap.
The general feature page: which channels connect and what each one supports.
Credentials, scopes and sync behaviour for the CardNexus Public API.
Why a pricing-only tool leaves the conflict problem unsolved.
How stock accuracy breaks down as a card shop adds channels.