Abstract: Systems, methods, and devices for assigning a transaction risk score are disclosed. According to one embodiment, a method for generating a transaction risk score may include: (1) receiving, by a transaction scoring service computer program and from an electronic device, a merchant URL that is being accessed by an application or a browser executed on the electronic device; (2) retrieving, by the transaction scoring service computer program, a plurality of transactions involving the merchant URL; (3) generating, by the transaction scoring service computer program, a risk score for the merchant URL based on the plurality of transactions; (4) generating, by the transaction scoring service computer program, a warning in response to the risk score exceeding a predetermined threshold; and (5) communicating, by the transaction scoring service computer program, the warning to the application or the browser.