US Patent 7401130 Click fraud prevention

Methods, apparatuses, and articles of manufacture for detecting, by an agent trusted by a merchant and a search engine, a click on an advertisement displayed by the search engine, are described herein. The trusted agent may further determine that a transaction of the merchant associated with the displayed advertisement was completed and determine whether the completed transaction was resulted from the click. In some embodiments, the trusted agent may notify the merchant and the search engine of a billing event associated with the click, if the completed transaction was determined to be resulted from the click.