Cedato, situated between supply and demand, enables you to aggregate as many demand sources as required behind a supply HTML/VAST tag. You can then export that tag and use it anywhere you want. The mechanism of optimization is part of that tag.
On the server side, the system looks at tags, scores demand sources and probabilities with the objective of serving ads at the highest rates. As a result, the algorithm may approach more than one demand source simultaneously, based on the responses received, the ad is served.