Polymarket US hits $8.7 billion as Coinbase and Roundtable push stablecoin media payments

Polymarket US has hit a $8.7 billion milestone. The engine behind that number is less about elections and more about football. In a separate development, Coinbase and Nasdaq-listed Roundtable are working on a way to pay media companies with blockchain rails. Sports are doing the heavy lifting Polymarket US is the CFTC-regulated version of the prediction market. It runs separately from Polymarket’s international platform. Research compiled for this story puts the platform’s 30-day notional volume at $11.8 billion as of mid-October 2026. That is a measure of the total face value of contracts traded over the period. Monthly trading volume reached $8.8 billion in September 2026. Sports contracts make up 98% of recent trading activity on Polymarket. NFL and college football events have been major drivers of participation. Polymarket also rolled out parlay-style contracts in August 2026, which let users bundle multiple outcomes into a single position. Weekly trading volumes have recently landed between $2.7 billion and $3.1 billion. Early in 2026, the platform was averaging just $60 million per week. Full access for American users arrived in May 2026, according to the research. Coinbase ...