Method and system are provided to facilitate transactions in a particular on-line trading platform from a third party web site. The system may be configured to associate identification information, such as a uniform resource locator (URL), with a reference to an item of merchandise on a web page provided by a third party entity. In response to a request originated from a client device of a user, the method may cause presentation of a listing of the item of merchandise maintained in the particular on-line trading platform and a visual control to facilitate commencing of a transaction process with respect to the item of merchandise in the on-line trading platform.