Polymarket Fed hold odds swing 27 points to 58.5% after Williams remarks
Polymarket traders repriced October 2026 Federal Reserve rate odds sharply on September 30 after dovish remarks from Williams. The probability of 'no change' jumped 27 percentage points in 24 hours to roughly 58.5%-60%, reversing prior hike bets that had reached 64% on September 27. The swing leaves the contract below prior extreme prints but still volatile as the October meeting approaches. Thin liquidity has amplified single statements into large daily moves before at this venue.
The 27-point reversal tests whether Polymarket's rate contracts have matured since the September whipsaws that burned traders at 93% and then 65%. Macro desks need evidence that post-hike pricing tracks policy signals, not sentiment echoes, before committing recurring flow. Williams' remarks alone should not move a well-anchored book this far.
The October 28-29 deadline gives Polymarket limited time to prove its depth can absorb concentrated positioning without the snapbacks that marked earlier cycles. Traders comparing against Kalshi's parallel book will migrate toward whichever venue shows steadier handling of Fed velocity. Each extreme print that reverses erodes institutional trust and feeds the novelty-venue label rivals exploit.