Abstract: A system and method for an antifraud shipping label system are described. The antifraud shipping label system includes a stamp generator and a stamp transaction registration module. The stamp generator generates stamps corresponding to a seller registered with an online marketplace application. Each stamp has a unique identifier with respect to the online marketplace application. The stamps are mailed to the seller. The stamp transaction registration module generates a presentation in which the identifiers that correspond to the stamps mailed to the seller are each partially displayed within the presentation. The stamp transaction registration module receives a selection of a partially displayed identifier as a selection made the seller, and associate shipping information from a transaction of the seller in the online marketplace application with the entirety of the partially displayed identifier selected by the seller.

Abstract: A system and method for a guaranteed shipping cost are described. A guaranteed shipping cost qualification module determines whether an item to be listed by a seller in an online marketplace qualifies for a guaranteed shipping cost listing. An estimated shipping cost computation module computes an estimated shipping cost of the item. A shipping cost reconciliation module reconciles an accrual of the estimated shipping cost received from the buyer with an actual shipping cost received from a shipping service provider for shipping the item. A learning module adjusts the estimated shipping cost computation module based on the reconciliation between the estimated shipping cost and the actual shipping cost.