Xandr's public loss table is a subset of OpenRTB. There is no Xandr code at 500 or above. The useful part is which of the standard integers they actually return, and which response fields those integers point at.
1 is an internal error. 3 is an invalid bid response. 4 is a deal id Xandr does not know. 5 is an auction id that did not match. 6 is a missing or malformed adomain. 7 is missing markup. 8 is a missing crid. 9 is a missing price. 100 is under the auction floor. 102 is a higher bid.
1 through 9 never reached price comparison. 100 and 102 did. Xandr's full published list also includes the creative-filter codes from 200 through 213.
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