The Prediction Markets

Which party will win the House race for PA-10?

Closes
Nov 3, 2027, in 13 months
Traded
$42K
Venues
Kalshi
Prices updated
just now
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What the markets expect

Janelle Stelson 82.2%

Next is Scott Perry at 17.8%. Only Kalshi lists this market, so there is no second price to compare.

Janelle Stelson 82.2%Scott Perry 17.8%

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. Ages are as of when this page was built.

  • Kalshi
Janelle Stelson
82.2%
Kalshi 83%(82.2% fair)polled, 31s agoBest Yes 83¢ on Kalshi, $100 pays $120 (1.20x)
Kalshi
Contract
Janelle Stelson
Last price
83%
Fair, margin removed
82.2%
As of
Polled just now
Buy Yes
83¢
Sell Yes
82¢
$100 on Yes pays
$120 (1.20x)
Volume
$24K
Trade this on Kalshi
Scott Perry
17.8%
Kalshi 18%polled, 31s agoBest Yes 18¢ on Kalshi, $100 pays $556 (5.56x)
Kalshi
Contract
Scott Perry
Last price
18%
As of
Polled just now
Buy Yes
18¢
Sell Yes
16¢
$100 on Yes pays
$556 (5.56x)
Volume
$18K
Trade this on Kalshi

Who resolves this market

Kalshi
Kalshi resolves via:
Kalshi (CFTC-regulated exchange), source: Library of Congress

How the odds have moved

The top 2 outcomes on both venues, with the consensus between them. Hover for exact values.

  • Janelle Stelson
  • Scott Perry

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.

Kalshi

Open on Kalshi ↗

Top of book

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Best bid
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Best ask
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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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Cover all 2 outcomes across venues

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

About this market

Live prediction market odds for "Which party will win the House race for PA-10?". Janelle Stelson leads at 82.2%. Next is Scott Perry at 17.8%. $42K has traded across 2 outcomes on Kalshi. 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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