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Earn.com is a website that you reply to emails and complete tasks to earn digital currency.
They have an app for mobile phones also.
I am using it about 2 months and I earned about 30$
You need to verify your account in order to cash out (You need a LinkedIn account with at least 50 connections and an .edu mail address)
https://earn.com/subuto/referral/?a=nl331e0mvhqkdrc5
Note: As far as I know, the photo is public. If I am wrong - let me know and I'll do my best to make things right.
Credits: Google.com