Counterfeiters have gotten good at copying photos, writing convincing descriptions, and even faking reviews. The one thing they cannot fake is your cost structure. A counterfeit operation has almost no cost of goods, no brand investment to recoup, and no authorized pricing to respect, so they compete on the one dimension where they have an unbeatable advantage: price. A listing at forty percent below your minimum advertised price is not a bargain hunter's dream. It is an economic confession.
The basic version is simple: set a floor based on your wholesale or MAP pricing, and flag any listing below it. If your product wholesales at eighty dollars, a retail listing at thirty-five is either counterfeit, stolen, or a pricing error, and all three deserve a look. The rule catches the obvious cases with almost no false positives, because legitimate sellers cannot sustainably sell below cost either.
The advanced version watches for patterns, not just levels. A new seller account listing your product at a steep discount is a stronger signal than a long-standing retailer running a promotion. Multiple listings at the identical suspicious price suggest a coordinated operation. And sudden price drops across several sellers at once often mean a new counterfeit batch just hit the market. The anomaly is in the behavior around the price, not just the number.
The fear that stops brands from using price rules is false positives: flagging a legitimate clearance sale or an authorized promotion. The fix is a whitelist, not a weaker rule. Maintain a list of authorized sellers and known promotion windows, and exempt them from the price floor. Seasonal sales, outlet channels, and refurbished programs all have predictable patterns; encode them once and the rule stays quiet during real discounts.
Also set the floor with margin, not at the edge. If your MAP is one hundred dollars, flag at seventy, not ninety-nine. You will miss the cautious counterfeiters who price at eighty-five, but you will also avoid crying wolf on every legitimate deal. The goal of the price rule is to catch the blatant cases automatically so your human reviewers can spend their time on the subtle ones.
A price flag is probable cause, not proof. Before filing, check the other signals: stolen product photos, a seller account younger than the product line, shipping from a region with no authorized distribution. Two or three corroborating signals turn a price anomaly into a takedown-ready case. And when you do file, mention the pricing explicitly; marketplaces process pricing-violation complaints through a faster queue than general counterfeit reports in many categories, because the evidence is a number, not a judgment call.
Price alone catches the obvious cases. The real power comes from combining it with two or three other cheap signals into a composite risk score. A listing that is 50 percent below MAP from a two-week-old account shipping from an unauthorized region is not three weak signals; it is one strong case. Build a simple scoring rule: price anomaly plus account age plus photo reuse. Listings that trip two or more get human review. Listings that trip all three get filed immediately.
This composite approach also handles the edge cases that break single-signal rules. A legitimate overstock seller might price low but will have an old account and original photos. A counterfeiter might price near MAP to avoid the price rule but will trip on stolen photos and a fresh account. No single signal is reliable, but the combination is hard to game because faking all of them at once is expensive. That is the entire logic of detection: make the counterfeiter spend more to look legitimate than they save by being fake.