Kalshi and Polymarket Fed hike odds collapse to 18% after weak jobs data
Kalshi traders cut the probability of an October Federal Reserve rate hike to 18% on Thursday, October 2, down from roughly 64% a week earlier. The repricing followed a weak September jobs report showing the U.S. economy added fewer jobs than expected. Traders on Polymarket moved in parallel as expectations shifted ahead of the late-October Fed meeting. The synchronized drop removed the venue split between Kalshi and Polymarket that had distorted positioning in earlier rate cycles. Both platforms now show matching 18% odds.
The synchronized 18% print on Kalshi and Polymarket removes the venue split that burned macro desks in earlier rate cycles. Traders who sized positions around Kalshi's 64% level a week ago or Polymarket's 58.5% no-change print face mark-to-market losses if they leaned into the prior hike thesis. The speed matches the ten-point single-day snapbacks that marked earlier cycles on both venues.
Macro desks now need to decide whether the 18% level anchors to actual policy probabilities or overshoots fair value again before the October decision deadline. The platform that shows steadier book depth through the next data prints will gain recurring rate-trading flow. The other risks trader flight to the tighter venue.