There are loads of website and app owners who need users to test out their sites for usability and bugs. They don't want their visitors to be confused when confronted with their website because they know that's one of the main reasons why people hit the back button and look for a more conducive site.
StartUpLift - The tests conducted here are most likely related to social media stuff, so your presence in the social media world would bolster your chance.
Earn Money for User Testing - Be a user tester with UserTesting and you can get paid to use websites and apps as you think out loud.
Analysia - Testers at Analysia review websites, and record themselves via microphone and screen-recording software, while following specific tasks that the client company requests.
TestingTime - Not only they conduct website user testing studies, they also have app testing studies you can participate in.
Whatusersdo – Pay is $8 or more via Paypal. Test takes around 15-20 minutes to complete. You must have a Mac or PC, Internet access, and microphone.
UserTesting – Pay is $10 per test. Do not need a web cam with this company.
YouEye – Pay is $12 per test study. A smartphone is recommended to receive more tests through their official app.
Enroll – Get paid to test websites, before they are published. Earn in cash rewards.
UTest – This company offers a variety of website testing opportunities.
UserFeel – This company pays around $10 per test.