Prolific

Unlike other survey sites it pays what it says you will get for a survey. The offered amount tends to be better for your time than others I have tried.
If you pay attention and actually take the surveys I have had very few come back and complain and want the submission amount back.

I have been a participant on Prolific for well over 2 years now. They were a good site - lots of interesting surveys and always paid reasonably and fairly quickly. I never had anyone expressing any problems with my work and my surveys were always approved by the people giving them.

But since July 2021 I stopped receiving any survey invites and no surveys were showing up on the site itself. I checked my profile status and there appeared to be no problems so I followed the advice on their FAQ and didn't contact them until 2 months had passed with no surveys whatsoever. When I did contact Prolific, it took them over a week to answer me and then I was told this:
'I'm afraid you won't be able to take part in further studies on Prolific because your account has failed one or more of our automated checks, as well as our manual review. Unfortunately, I can't give you any further information about the specifics of these checks and won't be able to reverse the decision.'

Unbelievable treatment from this site after several years of diligent and honest work. I've done nothing wrong whatsoever and now I'm suddenly banned without any warning or even the decency to let me know what's happened? Truly a despicable and vile site. Like all survey sites, they will ban you as soon as you start doing well without any explanation. Oh yeah, and they'll slander you as well without providing any proof of wrongdoing. Avoid this site at all costs unless you like being ripped off and insulted.