Automatic notification of irregular activity

A system including:

• means for receiving item data at a network-based transaction facility, the item data related to an item categorized in at least a first category of a plurality of categories of the network-based transaction facility and including an item price-based value associated with the item;
• means for automatically determining a category-specific threshold price-based value for the first category of the plurality of categories of the network-based transaction facility;
• means for automatically determining that the item data is irregular, based on the item price-based value associated with the item and the category-specific threshold price-based value for the first category of the plurality of categories of the network-based transaction facility;
• and
• means, responsive to the determination that the item data is irregular, for automatically communicating an electronic message to an entity associated with the item.

A system including;

• a database to receive and store item data, the item data related to an item categorized in at least a first category of a plurality of categories of a network-based transaction facility and including an item price-based value associated with the item;
• a database engine server including an irregular activity monitoring system, wherein the irregular activity monitoring system is automatically to:
• determine a category-specific threshold price-based value for the first category of the plurality of categories of the network-based transaction facility;
• determine that the item data is irregular, based on the item price-based value associated with the item and the category-specific threshold price-based value for the first category of the plurality of categories of the network-based transaction facility;
• and
• responsive to the determination that the item data is irregular, automatically communicate an electronic message to an entity associated with the item