I have been here in this forum for a long time and I have an on and off relationship with gambling and I don't know if it's because I don't search so much or there's really no one that's doing this but is there any website that offers chess matches where the winner will win the pot money that was pooled together by the two players fighting? I assume there's none of that yet but imagine the stuff that could happen when this is real, Carlsen playing for a 2 million dollars pot money against Nakamura, FIDE and WCF would definitely be mad about this if this is real.
I think you will have a hard time looking for such a website. The reason might be, that it's hard to deal with someone here since we don't know if we are playing against a real human or a bot. A talented player might also become a suspect for a robot even if they are not.
Maybe the best thing to do is, to consider creating a thread and set up a tournament here. Pot money should be handled by a reputable forum member to ensure that the winner will be paid fair and square. Try to check if there will be interested participants that will join.