Returns 1 if there is a Chartboost reward ad preloaded and ready to be displayed, otherwise 0. If so you can display it with ShowRewardAdChartboost. Adverts are preloaded after calling CacheRewardAdChartboost and after every reward advert is dismissed by the user. If this command continues to return 0 then ad loading may have failed due to the provider running out of ads and AGK will stop trying to load them. In this case you should try your other ad providers instead. If you find all your ad providers are returning 0 then you can try calling CacheRewardAdChartboost again, to restart the loading process to see if any new adverts have become available.
integer GetRewardAdLoadedChartboost()