
These are some basic guidelines on how to identify a scam site, whether be it a paid-to-click site, paid-to-read, paid-to-sign up, paid-to-promote, a survey site etc.
1. They require you to pay for a registration fee.
Most, if not all of the legitimate websites offer free membership. You don't have to pay anything to be a member of their website.
Or the registration is free but they require you to purchase their ebook to qualify as a member.
You're looking for ways to earn money, why would you need to pay first before getting paid?