Each year, $2 billion dollars is spent blindly on digital sign advertising in US retail environments like shopping centres and airports. There is no real-time data that enables these ads to target their audiences with relevant content. Adbiddr uses data from audience measurement technology on digital signs while a webcam tracks and identifies audience demographic information in front of digital signs in real time. Adbiddr offers advertisers audience demographic targeting, real-time bidding, A/B testing, analytics, accountability and gears up for the potential of repeat exposure effects when integrated with localised mobile advertising.