The Prediction Markets

Iowa Senate winner?

Closes
Nov 3, 2027, in 13 months
Traded
$6.8M
Venues
Polymarket, Kalshi
Prices updated
just now
Share

What the markets expect

Ashley Hinson 59%

Next is Republican at 58.5%. The venues differ most on Republican (Polymarket 57%, Kalshi 59%), a 2.0-point gap.

Odds by venue

Consensus blends each venue’s last price, weighted by how much has traded there. Best Yes price is the cheapest ask across venues, and the payout is what a winning $100 stake returns before fees. Open a row for each venue’s contract name, bid and ask, and how closely their rules match.

2 of 6 prices are live from the exchange feeds; the rest come from our regular price polls, the oldest 3 min ago. Ages are as of when this page was built.

  • Polymarket
  • Kalshi
Ashley Hinson
59%
Kalshi 59%polled, 3 min agoBest Yes 59¢ on Kalshi, $100 pays $169 (1.69x)
Kalshi
Contract
Ashley Hinson
Last price
59%
As of
Polled 3 min ago
Buy Yes
59¢
Sell Yes
57¢
$100 on Yes pays
$169 (1.69x)
Volume
$12K
Trade this on Kalshi
Republican
58.5%
Polymarket 57%live, just nowKalshi 59%live, just nowBest Yes 58¢ on Polymarket, $100 pays $172 (1.72x)
Polymarket
Contract
Ashley Hinson (R)
Price
57%
As of
Live feed, just now
Buy Yes
58¢
Sell Yes
56¢
$100 on Yes pays
$172 (1.72x)
Volume
$443K
Trade this on Polymarket
Kalshi
Contract
Ashley Hinson
Price
59%
As of
Live feed, just now
Buy Yes
59¢
Sell Yes
58¢
$100 on Yes pays
$169 (1.69x)
Volume
$2.8M
Trade this on Kalshi
Partial parity

Payoffs match in ordinary outcomes; see the rule differences below the table.

No arbitrage: the best bid elsewhere is 58¢, at or below the cheapest ask of 58¢.

Democratic
43.1%
Polymarket 43.5%polled, 37s agoKalshi 43%polled, 37s agoBest Yes 43¢ on Kalshi, $100 pays $233 (2.33x)
Polymarket
Contract
Josh Turek (D)
Last price
43.5%
As of
Polled just now
Buy Yes
44¢
Sell Yes
43¢
$100 on Yes pays
$227 (2.27x)
Volume
$562K
Trade this on Polymarket
Kalshi
Contract
Josh Turek
Last price
43%
As of
Polled just now
Buy Yes
43¢
Sell Yes
42¢
$100 on Yes pays
$233 (2.33x)
Volume
$3.0M
Trade this on Kalshi
Partial parity

Payoffs match in ordinary outcomes; see the rule differences below the table.

No arbitrage: the best bid elsewhere is 43¢, at or below the cheapest ask of 43¢.

Josh Turek
41%
Kalshi 41%polled, 3 min agoBest Yes 43¢ on Kalshi, $100 pays $233 (2.33x)
Kalshi
Contract
Josh Turek
Last price
41%
As of
Polled 3 min ago
Buy Yes
43¢
Sell Yes
40¢
$100 on Yes pays
$233 (2.33x)
Volume
$28K
Trade this on Kalshi

No cross-venue arbitrage right now: on every matched outcome, the best bid on one venue is at or below the cheapest ask on the other. Find markets with open spreads

Mostly the same bet: 4 differences

Where they differ

  • Kalshi settles on the party of the officeholder sworn in/inaugurated for the new term; Polymarket settles on the party of the called winner. They differ if the winner dies, withdraws or is not seated before the term starts.
  • Independents: Polymarket assigns a non-affiliated winner by stated caucus (House) or excludes independents from party options (Senate/Governor); Kalshi requires party membership.
  • Kalshi may close early on a media-consensus projection; Polymarket resolves on consensus calls with certification as the fallback.
  • Trading closes at different times: Nov 4, 2026, 4:59 AM UTC on Polymarket and Nov 3, 2027, 3:00 PM UTC on Kalshi.
Polymarket
Polymarket resolves via:
UMA optimistic oracle
Kalshi
Kalshi resolves via:
Kalshi (CFTC-regulated exchange), source: United States Congress, Iowa Secretary of State
Show full rule comparison
  • Kalshi settles on the party of the officeholder sworn in/inaugurated for the new term; Polymarket settles on the party of the called winner. They differ if the winner dies, withdraws or is not seated before the term starts.
  • Independents: Polymarket assigns a non-affiliated winner by stated caucus (House) or excludes independents from party options (Senate/Governor); Kalshi requires party membership.
  • Kalshi may close early on a media-consensus projection; Polymarket resolves on consensus calls with certification as the fallback.
  • Trading closes Nov 4, 2026, 4:59 AM UTC on Polymarket and Nov 3, 2027, 3:00 PM UTC on Kalshi.

Summarized from each venue’s published rules; the venue’s own rules page is the final word.

How the odds have moved

The top 3 outcomes on both venues, with the consensus between them. Hover for exact values.

  • Ashley Hinson
  • Republican
  • Democratic

Order books

Each venue’s resting orders for the selected outcome’s Yes contract, side by side. Top of book streams live; depth refreshes every 15 seconds.

Polymarket

Polymarket doesn’t list Ashley Hinson for this event.

Kalshi

Open on Kalshi ↗

Top of book

Connecting
Best bid
—
Spread
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Best ask
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Waiting for the first live quote…

Depth · top 8 levels

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Recent trades

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What your stake buys

Enter a stake to see where it buys the most after fees, using each venue’s live order book.

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Buy

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Buys at the asks resting now (taker orders), cheapest after fees first, from order-book snapshots up to 15 seconds old. Fees: Kalshi 0.07 × price × (1 − price) per share, rounded up to the cent; Polymarket 0.04 × price × (1 − price) per share (politics rate). Fee calculator. Estimates only, not advice.

About this market

Live prediction market odds for "Iowa Senate winner?". Ashley Hinson leads at 59%. Next is Republican at 58.5%. $6.8M has traded across 4 outcomes on Kalshi and Polymarket. The market is expected to resolve by Nov 3, 2027.

Questions

What does the consensus price mean?

It is the price of a Yes contract that pays $1 if the outcome happens. A 14¢ price means traders put the chance near 14%. Where two venues list the same outcome, we blend their last prices, weighting the venue with more trading volume more heavily (neither counts for less than a quarter). When only one outcome can win, each venue’s prices add up to a little over 100% (its margin); the fair chance removes that margin so the outcomes add up to exactly 100%.

How is the payout worked out?

A Yes contract pays $1 if it wins, so at the best ask a $100 stake buys 100 ÷ ask contracts. At 18¢ that is about 555 contracts, paying $556 (5.56x) if Yes happens. Venue fees and price slippage on larger orders are not included.

Why do the venues show different prices?

Each venue has its own traders, fees and order book. Contracts can also settle on slightly different terms, which is why each row lists how closely the rules match.

Is a price gap an arbitrage?

Only when you can buy Yes on one venue below what someone pays for Yes on the other, after fees, and both contracts settle the same way. We show the executable bid and ask so you can check.

How fresh are these prices?

Venue prices refresh every few minutes, and the order book and live quotes stream continuously. Each venue’s card shows when we last observed it.

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