This app was mentioned in 2 comments, with an average of 2.00 upvotes
I am a US citizen. That said, this is good for some international countries: https://play.google.com/store/apps/details?id=com.citizenme&hl=en
Requires Android phone, data plan. Pays in British Pounds. (GBP for short).
Name: citizenme (www.citizenme.com)
Pitch: An app that puts personal data and Artificial Intelligence in the hands of people. citizenme helps you take control of your data and gain value from it- you can exchange your personal data for cash rewards and personal insights.
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download for iOS here: https://itunes.apple.com/gb/app/citizenme/id863070348?mt=8
download for android here: https://play.google.com/store/apps/details?id=com.citizenme&hl=en_GB