Detecting click fraud that includes a client device capable of accessing a server hosting a web page containing an advertisement. The client device includes a network interface allowing access to the server and code on the client device. The code accesses and displays a web page containing an advertisement, provides mechanisms (e.g., an applet, an ActiveX control, a plugin, a JavaScript, a browser scripting language, browser extensions, or code native to the browser) associated with each pixel cluster where each mechanism captures information regarding the transit of the pixel cluster by a cursor on the web page, and collects information based on the capturing by each associated mechanism regarding the transit of the pixel cluster by a cursor on the web page.