TradeAds.eu is an online advertising exchange platform based in Romania that connects advertisers and publishers. It uses a generalized second-price auction model where the winning advertiser pays the second highest bid plus a small increment. Advertisers can target ads based on location, demographics, and maximize bids. Publishers generate income from their unsold inventory and can track performance metrics like click-through rates and earnings. The platform also has programs like banner exchanges and referrals to help publishers promote their sites.