Paid surveys
Market research panels pay for opinions. You keep the large majority of what they pay us.
A survey router shows you studies you might qualify for based on what you have already told it. Qualifying is the whole game: panels are looking for a specific group of people for each study, and being screened out is not a mistake or a penalty. It happens to everybody, which is why a screen-out still earns a small consolation payment.
Answer consistently and you will qualify more often. Answering randomly to get through the screener faster does the opposite, because panels check for straight-lining and contradictions and will stop showing you work.
Surveys pay the most per minute of anything on the site, and they are also the most frustrating, because the qualification rate is out of everybody's hands. Treat them as the main course and the faucet as the side.