Promotional content provided by content providers is distributed to mobile devices to be displayed with designated videos on mobile devices. The promotional content is received from a content provider, e.g., via an API and associated with a video, group of videos or channel available from a video hosting server. The promotional content meets certain specifications set by the video hosting server. A mobile device requests promotional content for a selected video and the video hosting server provides any available promotional content to the mobile device. The promotional content is displayed with the selected video as designated by the content provider. Activation of the promotional content in some embodiments results in an action being invoked on the mobile device, such as loading of a uniform resource identifier. In some cases, the promotional content is cached by the mobile device for later use.