The main reasons we have seen publishers opt for post-bid (instead of header bidding) are: 1. The creative runs an auction for the bidders using prebid.js, which then displays the highest price creative in that creative’s ad slot. The post-bid line item’s creative is served to the page.In this case, the post-bid line item wins because the eCPM on the line item is high (based on historical price) and the higher priority class 1 line items have all exhausted their spend. The ad server chooses a winning line item among class 1, exchanges, and the post-bid line items.The webpage sends an impression to the ad server.In post-bid, your mediated demand sources no longer run daisy chain they all compete in one single line item based on price. in header bidding, demand sources compete BEFORE your ad server has seen the impression). In post-bid, the competition among your mediated demand sources compete AFTER your ad server has chosen the winning line item (vs. Post-bid allows a publisher’s mediated demand sources all compete in one auction based on price, after the ad server has picked the post-bid line item.
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