Since an above user already mentioned that Vindale might not be aboveboard, I'm just going to echo that there are a lot of legitimate survey = $$ sites, though not necessarily as a source of steady income. Someone more experienced with GPT business is probably best qualified, but about the most secure opportunity you can get is to sign up for market research surveys, medical testing (!!) or other such things. They don't happen regularly, but they're easy money for more than your likely hourly rate. Just don't mention that you work in marketing or advertising (ever!!!)