No, Vendoo doesn't know when your item has sold. You need to mark as sold.

When you change the status of an item to sold, your item will automatically be removed from the remaining marketplaces, and Vendoo will do the profit and revenue calculations.

Automatic sold detection is a highly requested feature that is in progress!

In the meantime, this article will show you how to mark items as sold on the Vendoo desktop website, and this article will teach you how to do it on the mobile app.