The Prediction Markets

How many House seats will Democrats win in New York?

Closes
Nov 3, 2027, in 13 months
Traded
$47K
Venues
Polymarket, Kalshi
Prices updated
just now
Share

What the markets expect

20 33.1%

Next is 19 at 29.1%. The venues differ most on 21+ (Polymarket 29.5%, Kalshi 13%), a 16-point gap.

20 33.1%19 29.1%21+ 16.5%22 6.1%23 5.1%5 others 10.1%

Odds by venue

Fair chance strips out each venue’s built-in margin (its prices add up to more than 100%), then blends the venues by how much has traded there, so the outcomes add up to 100%. 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.

Prices come from our regular polls of each venue, the oldest 2 min ago. Ages are as of when this page was built.

  • Polymarket
  • Kalshi
20
33.1%
Polymarket 33.5%(28.7% fair)polled, 28s agoKalshi 38%(37.3% fair)polled, 2 min agoBest Yes 35¢ on Polymarket, $100 pays $286 (2.86x)
Polymarket
Contract
20
Last price
33.5%
Fair, margin removed
28.7%
As of
Polled just now
Buy Yes
35¢
Sell Yes
32¢
$100 on Yes pays
$286 (2.86x)
Volume
$3K
Trade this on Polymarket
Kalshi
Contract
20
Last price
38%
Fair, margin removed
37.3%
As of
Polled 2 min ago
Buy Yes
38¢
Sell Yes
31¢
$100 on Yes pays
$263 (2.63x)
Volume
$2K
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 31¢, at or below the cheapest ask of 35¢.

19
29.1%
Polymarket 30%(25.7% fair)polled, 28s agoKalshi 30%(29.4% fair)polled, 2 min agoBest Yes 31¢ on Polymarket, $100 pays $323 (3.23x)
Polymarket
Contract
19
Last price
30%
Fair, margin removed
25.7%
As of
Polled just now
Buy Yes
31¢
Sell Yes
29¢
$100 on Yes pays
$323 (3.23x)
Volume
$4K
Trade this on Polymarket
Kalshi
Contract
19
Last price
30%
Fair, margin removed
29.4%
As of
Polled 2 min ago
Buy Yes
32¢
Sell Yes
30¢
$100 on Yes pays
$313 (3.13x)
Volume
$6K
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 30¢, at or below the cheapest ask of 31¢.

21+Arb
16.5%
Polymarket 29.5%(25.3% fair)polled, 28s agoKalshi 13%polled, 2 min agoBest Yes 17¢ on Kalshi, $100 pays $588 (5.88x)
Polymarket
Contract
21+
Last price
29.5%
Fair, margin removed
25.3%
As of
Polled just now
Buy Yes
31¢
Sell Yes
28¢
$100 on Yes pays
$323 (3.23x)
Volume
$1K
Trade this on Polymarket
Kalshi
Contract
21
Last price
13%
As of
Polled 2 min ago
Buy Yes
17¢
Sell Yes
13¢
$100 on Yes pays
$588 (5.88x)
Volume
$7K
Trade this on Kalshi
Same label, rules unverified

Labels suggest the same named outcome; no persisted outcome identity or settlement parity is verified.

Buying on Kalshi at 17¢ and selling on Polymarket at 28¢ nets 1100 bps before fees.

22
6.1%
Kalshi 6%polled, 2 min agoBest Yes 6¢ on Kalshi, $100 pays $1,667 (16.7x)
Kalshi
Contract
22
Last price
6%
As of
Polled 2 min ago
Buy Yes
6¢
Sell Yes
3¢
$100 on Yes pays
$1,667 (16.7x)
Volume
$7K
Trade this on Kalshi
23
5.1%
Kalshi 5%polled, 2 min agoBest Yes 6¢ on Kalshi, $100 pays $1,667 (16.7x)
Kalshi
Contract
23
Last price
5%
As of
Polled 2 min ago
Buy Yes
6¢
Sell Yes
3¢
$100 on Yes pays
$1,667 (16.7x)
Volume
$2K
Trade this on Kalshi
18
3.6%
Polymarket 6%(5.1% fair)polled, 28s agoKalshi 3%polled, 2 min agoBest Yes 10¢ on Kalshi, $100 pays $1,000 (10.0x)
Polymarket
Contract
18
Last price
6%
Fair, margin removed
5.1%
As of
Polled just now
Buy Yes
10.4¢
Sell Yes
1.5¢
$100 on Yes pays
$962 (9.62x)
Volume
$1K
Trade this on Polymarket
Kalshi
Contract
18
Last price
3%
As of
Polled 2 min ago
Buy Yes
10¢
Sell Yes
1¢
$100 on Yes pays
$1,000 (10.0x)
Volume
$5K
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 1.5¢, at or below the cheapest ask of 10¢.

Above 23
3%
Kalshi 3%polled, 2 min agoBest Yes 4¢ on Kalshi, $100 pays $2,500 (25.0x)
Kalshi
Contract
Above 23
Last price
3%
As of
Polled 2 min ago
Buy Yes
4¢
Sell Yes
1¢
$100 on Yes pays
$2,500 (25.0x)
Volume
$1K
Trade this on Kalshi
16
1.6%
Polymarket 0.2%polled, 28s agoKalshi 2%polled, 2 min agoBest Yes 0.2¢ on Polymarket, $100 pays $50,000 (500x)
Polymarket
Contract
16
Last price
0.2%
As of
Polled just now
Buy Yes
0.2¢
Sell Yes
0.1¢
$100 on Yes pays
$50,000 (500x)
Volume
$655
Trade this on Polymarket
Kalshi
Contract
Below 16
Last price
2%
As of
Polled 2 min ago
Buy Yes
2¢
Sell Yes
—
$100 on Yes pays
$5,000 (50.0x)
Volume
$2K
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 0.1¢, at or below the cheapest ask of 2¢.

16
1%
Polymarket 1.1%polled, 28s agoKalshi 1%polled, 2 min agoBest Yes 1.9¢ on Polymarket, $100 pays $5,263 (52.6x)
Polymarket
Contract
16
Last price
1.1%
As of
Polled just now
Buy Yes
1.9¢
Sell Yes
0.3¢
$100 on Yes pays
$5,263 (52.6x)
Volume
$374
Trade this on Polymarket
Kalshi
Contract
16
Last price
1%
As of
Polled 2 min ago
Buy Yes
2¢
Sell Yes
—
$100 on Yes pays
$5,000 (50.0x)
Volume
$2K
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 0.3¢, at or below the cheapest ask of 2¢.

17
0.9%
Polymarket 0.8%polled, 28s agoKalshi 1%polled, 2 min agoBest Yes 1.2¢ on Polymarket, $100 pays $8,333 (83.3x)
Polymarket
Contract
17
Last price
0.8%
As of
Polled just now
Buy Yes
1.2¢
Sell Yes
0.3¢
$100 on Yes pays
$8,333 (83.3x)
Volume
$792
Trade this on Polymarket
Kalshi
Contract
17
Last price
1%
As of
Polled 2 min ago
Buy Yes
3¢
Sell Yes
—
$100 on Yes pays
$3,333 (33.3x)
Volume
$3K
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 0.3¢, at or below the cheapest ask of 3¢.

Possible arbitrage before fees: buy 21+ on Kalshi at 17¢, sell on Polymarket at 28¢ (1100 bps). Check the rules below before trading. See all live spreads

Mostly the same bet: two differences

Where they differ

  • Seat counts depend on when races are called; venues use different settlement deadlines for uncalled seats.
  • 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: New York State Board of Elections
Show full rule comparison
  • Seat counts depend on when races are called; venues use different settlement deadlines for uncalled seats.
  • 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.

  • 20
  • 19
  • 21+

Live prices for 20

What it costs to buy Yes, what you would get selling it, and the last trade on each exchange, updating as orders change. Hover a status for timing details.

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.

Combined depth · both venues

Loading both order books…

Polymarket

Open on Polymarket ↗

Top of book

Connecting
Best bid
—
Spread
—
Best ask
—

Waiting for the first live quote…

Depth · top 8 levels

Loading snapshot…

Recent trades

Loading…

Kalshi

Open on Kalshi ↗

Top of book

Connecting
Best bid
—
Spread
—
Best ask
—

Waiting for the first live quote…

Depth · top 8 levels

Loading snapshot…

Recent trades

Loading…

What your stake buys

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

$
Buy

Loading both order books…

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 0.05 × price × (1 − price) per share (other / general rate). Fee calculator. Estimates only, not advice.

About this market

Live prediction market odds for "How many House seats will Democrats win in New York?". 20 leads at 33.1%. Next is 19 at 29.1%. $47K has traded across 10 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.

More other markets

See all other markets