Abstract: In an online marketplace, buyers and sellers engage in transactions. Some transactions are fraudulent. The online marketplace uses a fraud detection system that identifies fraudulent transactions before an account holder is defrauded. In some example embodiments of the systems and methods described herein, a fraud detection system uses information that is indirectly associated with a transaction to determine if the transaction is fraudulent. A user interface is provided that shows relationships between accounts and objects. In response to input received via the user interface, the fraud detection system performs an action on an account, an object, or a transaction.

Abstract: In an online marketplace, buyers and sellers engage in transactions. Some transactions are fraudulent. The online marketplace uses a fraud detection system that identifies fraudulent transactions before a buyer or a seller is defrauded. In some example embodiments of the systems and methods described herein, a fraud detection system uses information that is indirectly associated with a transaction to determine if the transaction is fraudulent. For example, an object may be used by a first account to commit fraud in a first transaction. The same object used in the first fraudulent transaction may be used by a second account in second transaction with high probability of being fraud. The second account may use another object and participate in a third transaction. On the basis that the second account is associated with an object associated with fraud, the fraud detection system increases a fraud score for the third transaction.

Abstract: In an online marketplace, buyers and sellers engage in transactions. Some transactions are fraudulent. The online marketplace uses a fraud detection system that identifies fraudulent transactions before an account holder is defrauded. In some example embodiments of the systems and methods described herein, a fraud detection system uses information that is indirectly associated with a transaction to determine if the transaction is fraudulent. A user interface is provided that shows relationships between accounts and objects. In response to input received via the user interface, the fraud detection system performs an action on an account, an object, or a transaction.