Chartboost RTB error 3: Invalid Bid Response
What Chartboost says
Chartboost lists 3 as an invalid bid response.
Chartboost reports this integer in the ${AUCTION_LOSS} macro on the bid's lurl. A search for Chartboost RTB error 3 is this code.
What was checked
Chartboost rejected the bid before price comparison. OpenRTB groups 1 through 10 as a response the exchange could not use: a bad id, missing markup, a missing price, or a domain it will not accept.
What to change
Validate the response before it is sent. Chartboost does not publish a narrower reason under 3.
The same number in OpenRTB
OpenRTB loss reason 3 is Invalid Bid Response. Chartboost publishes this integer with that meaning.