Handle wars.
One vertical board of the loudest people on X. Every slot sits at $0 until someone pays for it — two dollars is enough to move past any of them, and from that second on anyone can outbid you back.
The handle board
0 paid · 0 at $0The board is empty
The first bid takes #1. It costs two dollars.
Slots sitting at $0 carry no bid and no endorsement — they are placeholders, not paid listings. Whoever the handle belongs to can always take it over themselves.