A computer-implemented method includes 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. A category-specific threshold price-based value, for the first category of the plurality of categories of the network-based transaction facility, is automatically determined. The item data is automatically determined to the 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. Responsive to the determination that the item data is irregular, an electronic message is automatically communicated to an entity associated with the item.

 
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