Kalshi Fed hike odds hit 88% as Polymarket holds $50M on no change
Kalshi traders have repriced September Federal Reserve rate hike odds to 88% ahead of the September 16 FOMC decision, up from 79% two days earlier. The shift followed hotter-than-expected August CPI data. Polymarket diverges sharply, with more than $50 million in volume resting on 'no change' even as other venues price roughly 88% odds of a 25-basis-point increase. CME Group's FedWatch tool shows an 83% to 90% probability.
The 88% Kalshi print against Polymarket's $50 million 'no change' pool creates the widest venue split on a live Fed call since these contracts launched. A trader siding with Kalshi faces the risk that Polymarket's crypto-native base is front-running a dovish pivot or binary settlement nuance.
If the Fed holds and Polymarket's edge proves structural, Kalshi's rate-trading credibility with macro desks suffers. If the Fed hikes, Polymarket's 'no change' positions vaporize and the venue absorbs settlement pain at scale. The September 16 decision will validate one book as the superior macro signal and expose the other to trader flight.