Chartboost RTB error 0: Bid Won
What Chartboost says
Chartboost can report 0 when the bid won. The clearing price macro is filled only when the loss code is 0.
Chartboost reports this integer in the ${AUCTION_LOSS} macro on the bid's lurl. A search for Chartboost RTB error 0 is this code.
What to change
Use nurl for the win. Chartboost fills the minimum-bid macro only when the code is 102, and only if that macro is enabled for the seat.
The same number in OpenRTB
OpenRTB loss reason 0 is Bid Won. Chartboost publishes this integer with that meaning.