Ranked by velocity — calls per hour, weighted by uniqueness of buyer wallet. Updates every 5 minutes. Never paid placement.
Velocity = calls in window × uniqueness factor (distinct buyer wallets / total calls, clamped to [0.4, 1]). New listings get a 12-hour grace boost so a single power-user can't pin a friend's listing to position 1. Sellers paying for featured slots are excluded from this list — featured appears separately on category pages, always labeled.