Suggestions

Hey! I’m just checking to see if anyone has any suggestions for a feature I’m trying to build into a site. I am looking for a plugin that will allow users to be able to name a price for a task they want done. The job poster will then be able to choose who gains access to the rest of the information in order to complete the job. Anyone built anything similar or have any suggestions? The site will need to receive a percentage of the total amount agreed on to complete the job.