StumbleUpon Ads will no longer be accessible as of June 30th, 2018. We appreciate your partnership over the years as we have brought the highest quality of native advertising to over 40 million stumblers.
You can login here to view and use your balance, if any. You will not be able to access or use any remaining balance that is not used by the June 30th, 2018.
For questions regarding this process you can check out our FAQ and our Paid Discovery Terms and Conditions
The StumbleUpon Ads Team