List of websites paying members ?

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I am wondering if there exist a list or website where we can find out whether it is scam or members are really paid for their hardword. Is there any rating system ? I become member of some websites but don't know they pay on time or not. The payments which i have received till now or i can say on time are : (1) mylot (2) polarptr (3)no-minimum (4)donkeymails i hope you also share your exp.