Clickworker is a company that has specialised in crowdsourcing. In order to provide crowdsourcing they need a crowd, which is known as click workers.
As a clickworker you can participate in minor projects, some can take as little as a minute, while others can take a little longer, maybe up to an hour. You will be paid a small amount of money for each project, and once they have been accumulated they get paid to you. They do not get paid once a month but whenever your balance exceed a certain amount.
The projects are very easily done and you do not need to allocate a lot of time for these. The amount of available projects depends on your location and your language, however it is not unheard of that you can earn more than €100 a month.
If you want to sign up as a clickworker, it can be done here: