Methods and apparatus are disclosed to measure exposure to streaming media using media watermarks. An example apparatus includes a memory, and a logic circuit to cause transmission of media, received from a service provider, to a media device in response to a first request for the media, the media including instructions to cause the media device to (1) determine a source Uniform Resource Locator, (2) determine a current playback time of the media, and (3) transmit a second request for metadata of the media to the apparatus, and metadata associated with the source Uniform Resource Locator and the current playback time of the media, the second request including the source Uniform Resource Locator of the media and the current playback time of the media. Example systems, methods, and apparatus disclosed herein enable a single set of monitoring instructions to be operated on multiple different devices and/or browsers.