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i'm also a member of earn.com. The payment is in bitcoin. So you're sent a short survey and you fill afterwards you're paid according to your set contact price instantly.

About $60 a month... not much when you are not subscribed to worthier lists. However, it helps bounce unimportant e-mails

That is interesting. I will have to take a look at this. Any tips for getting started on there?

Just sign up and subscribe to lists that relate to you. Browse the lists available and observe what fits