In the UK, YouGov is probably the best - it's roughly 50p per survey. Used to be a good deal up until the last few years - nowadays inflation had destroyed It's worth. When I was a teenager earning less then £4 per hour it made sense, but now that the minimum wage is £10+ your better of doing a hour of overtime!
I did make a couple of hundred quid a few years ago doing surveys with another company - but I just got lucky with a good company. Most of the time I tried it the work wasn't worth it. These days even less so as the money doesn't go as far. I'm better off selling random stuff on eBay.