For one of our publishers, Prebid was not bidding on auto-refresh ads. This was directly impacting his revenue because the competition on refresh ad requests was only taking into consideration the bids from GAM.
How did we spot it?
Through Pubstack’s granular data, we were able to notice an abnormal fill rate.
In Pubstack, we consider that the number of auctions in Prebid equals the number of auctions in GAM. In this case, we were seeing a fill rate of more than 100%. We were then able to conclude that this fill rate was due to the fact that GAM was bidding on more auctions than Prebid.
This led us to understand that Prebid was not bidding on auto-refresh ads, thus impacting the publisher’s revenue directly.
Pubstack’s support team helped fix the publisher’s code which allowed Prebid to bid on auto-refresh ads again and increase revenue.