Sell a book on one marketplace and BookRouter takes it down everywhere else. This is the core protection against double-selling, and it runs automatically once your marketplaces are connected.

How it works
For marketplaces that support order download (AbeBooks, Biblio, Amazon, and eBay), BookRouter regularly retrieves your sold orders. When a sale comes in:
- The item's quantity is reduced in your inventory (and its status set to Sold when the last copy goes).
- Removal or quantity updates go out to every other connected marketplace on the next sync.
- The sale is recorded in your unified sales history under that marketplace's channel, so it shows up in your Sales report alongside your other channels.
Sales on your own website work the same way in reverse: a checkout reduces the quantity and the marketplaces are updated on the next run.
The setting
On each supported marketplace's settings page, the Sync Rules card has the auto-mark-sold toggle. It is on for almost everyone; turn it off only if you deliberately manage sold stock by hand (and understand the double-selling risk).
Venues without order download
Alibris, Antiqbook, viaLibri, and custom routes do not report sales back. Sales made there need to be recorded manually (the Sell Item button is the quickest way); the quantity change then propagates to the other venues automatically.
Timing: syncs run on a schedule, so there is a window between a sale and its removal elsewhere. Multi-venue sellers occasionally sell the same single copy twice in that window; when it happens, cancel the later sale on its venue promptly.