When joining a Survey Panel for Paid Survey, you could first check how long the Survey Panel has been in business and whether it is associated with Market Research associations. Even though associated with Market Research associations does not necessary prove the Survey Panel is credible, it does offer certain standard of quality.
You may also research about the Survey Panel's background, the feedback from other members of the panel, any past payment proofs of the panel or even test out the response of the member's support to see how seriously the Survey Panel values their members.
Alternatively, you could make use of portal like PanelPlace.com which has reviewed and filtered away the bad apples and only features the good apples. PanelPlace doesn't have the longest list of Survey Panels but it has the ones that pay and matter to you.
In order to make money from Paid Surveys, you need to identify which company is reliable and lasting so that it worths your time and effort.