To do this, you can do your own research. Take 10 bounties that have ended in the last half a year, and see if their coins are currently traded and how much they cost. This will give you a more or less complete idea; for a larger sample, take not 10 but 50 projects.
I recommend that you make a selection of projects that came out half a year ago, and see which managers were leading them, how quickly the payment was made, and how much the participants of various bounty companies eventually managed to earn.