About 70% of Polymarket’s closed markets logged under $10,000 in reported trading volume from 2021 through end-May 2026, and more than 45,000 markets showed no reported volume, a CNBC analysis found. The findings, according to BeInCrypto, used Polymarket’s Gamma API, which counts notional volume on both sides of each trade, and showed fewer than 10% of closed markets drew $100,000 to $1 million.

University of San Diego professor Joshua Della Vedova said bots drove over 80% of volume in sub-$10,000 markets and estimated bot profits of roughly $1.2 million there, $50.5 million in $1 million-$10 million markets, and $35.1 million above $10 million.