{"page":"/blog/how-real-time-bidding-works","modified":"2026-11-10","license":"https://creativecommons.org/licenses/by/4.0/","columns":["Question","Second-price auction","First-price auction"],"rows":[["Who wins?","The highest bid (DSP A)","The highest bid (DSP A)"],["What does the winner pay?","Just above the second-highest bid, about $3.50 in the example","Its own bid, $5.00 in the example"],["Best strategy for buyers","Bid your true value; the rule protects you","Bid below your true value; this is called bid shading"],["Role of the floor","Can lift the price when only one bidder clears it","A hard minimum; bids below it are dropped"],["OpenRTB code","at = 2, \"Second Price Plus\" (the default)","at = 1"],["Where used today","Older setups and some deals; check the at field","Google Ad Manager since 2019 and other major exchanges"]],"sourceUrls":[[],[],[],[],[],[]]}