I have seen several websites where you can attach a bounty to a question. StackOverflow does that with reputation, but I have seen some sites do it with money.

I have seen several websites where you can attach a bounty to a question. StackOverflow does that with reputation, but I have seen some sites do it with money. First relevant result on Google (not a recommendation): https://bountyquestion.com/ https://bountyquestion.com/