Prediction markets opened the week with sharp repricing across three dominant themes: a Fed decision looming on November 5, fresh economic data cooling recession fears, and a tightening Senate map eight days ahead of the midterm cycle’s final debates. Here are the contracts that moved most in the last 24 hours on Kalshi and Polymarket, with the odds traders are actually paying right now.
Fed Cuts in November: Odds Spike to 72%
The biggest institutional flow of the day landed on the “Fed cuts rates by 25 bps on November 5” contract. The market opened Monday at 61% and closed the US session at 72%, with over $4.1M in matched volume on Kalshi’s rate-decision series alone. The move follows last Friday’s PCE print, which came in at 2.4% year-over-year, below the 2.6% consensus.
Polymarket’s parallel contract on the same decision closed slightly tighter at 74%, suggesting a modest arbitrage spread of two percentage points, inside typical fee-adjusted bounds. Traders appear to be positioning for a dovish statement rather than a surprise hold, with the “no change” leg collapsing from 34% to 23% in the same window.
Senate Control: Republicans Reclaim the Lead at 54%
Election markets had the most dramatic 24 hours of any category. Kalshi’s “Which party will control the Senate after the 2026 election?” contract flipped overnight. Republicans moved from 48% to 54%, while Democrats slid from 51% to 45%. The move was concentrated in three state races:
- Ohio Senate: Republican nominee’s odds climbed from 58% to 66% after a well-received debate performance and an endorsement from the state’s largest police union.
- Montana Senate: Flipped from a 52% Democratic lead to a 55% Republican lead following internal polling leaks reported Monday afternoon.
- Pennsylvania Senate: Tightened to a true toss-up at 50/50, down from 56% Democratic a week ago.
Polymarket volume on the Senate control contract crossed $12.8M over the weekend, making it the highest-volume political market of October so far.
Bitcoin Year-End: $120K Target Loses Steam
Crypto prediction markets saw a notable repricing of year-end Bitcoin targets. The “BTC above $120,000 by December 31, 2026” contract fell from 44% to 36% after spot prices rejected the $112K resistance level twice in 48 hours. The “BTC above $100,000 at year end” leg held firmer at 78%, suggesting traders have shifted from upside speculation to downside protection.
Ethereum markets moved in sympathy. The “ETH above $5,000 by December 31” contract declined from 29% to 24%. Volume on both contracts remains elevated, with Polymarket reporting its highest weekly crypto activity since the September halving aftermath.
Economic Data: Recession Odds Hit a Cycle Low
The “US recession declared by NBER in 2026” contract on Kalshi dropped to 11%, its lowest reading since January. Three catalysts drove the move: Q3 GDP’s second estimate revised up to 3.1%, October’s ISM manufacturing print at 51.4 (above 50 for the first time in six months), and continuing jobless claims trending below 1.75M. The “recession declared in 2027” leg also softened, from 29% to 24%.
Markets are now pricing a “soft landing” scenario at roughly 61% through the end of 2027, up from 48% a month ago. This positions prediction markets more optimistically than the Blue Chip economist survey, which still shows 32% recession odds within 12 months.
Where to Trade These Markets
All of the contracts referenced above are tradable on both major US-regulated prediction market venues. For Fed, Senate, and economic data markets, Kalshi offers CFTC-regulated access with institutional-grade liquidity and sub-penny spreads on the largest contracts. For crypto, election, and global-event markets, Polymarket provides deeper books and 24/7 trading on-chain.
Before placing capital, cross-check pricing across both venues. The arbitrage window on today’s Fed contract (two points on Kalshi vs Polymarket) is representative of what disciplined traders can harvest when markets are moving fast. For a full breakdown of fees, liquidity profiles, and account setup, see our updated best prediction markets rankings.
Odds and volumes reported above reflect closing prints from the US trading session on October 20, 2026. Prediction market prices move continuously; verify live quotes before trading.