It is Free to join PanelPlace marketplace! You do not have to pay anything to join PanelPlace.
You can also find and enjoy many Free opportunities such as online paid market research surveys, finding a job, side gig, rewards site and many more!
However, there are some opportunities with a monthly subscription or 1-time payment is required to start using the products or services (e.g. register a class/courses, buying travel-related products, movie/music subscription etc). So do find out and understand clearly about your interested product or services before joining/registering with them.