The Overround / Markets / Elections
Priced on Kalshi and Polymarket at the same moment. These are raw ask prices, what it actually costs to take the position, margin included.
| Outcome | Kalshi | Polymarket | Cheaper |
|---|---|---|---|
| 7 | 39¢ | 37¢ | Polymarket |
| 8 | 33¢ | 36¢ | Kalshi |
| 9 | 14¢ | 18¢ | Kalshi |
| 6 | 13¢ | 16¢ | Kalshi |
| Below 6 | 2¢ | – | |
| 10 | 2¢ | – |
The two venues disagree most on 9: 14¢ on Kalshi against 18¢ on Polymarket, a gap of 4¢ on the same outcome.
Only outcomes with a live two-sided quote are shown. Polymarket prices are matched to this market by outcome name; where a name has no counterpart the cell is left empty rather than guessed. Prices as of Thu, 17 Sep 2026 04:55:29 UTC.
Add up what it costs to back every outcome here and Kalshi's board comes to 103.5%, Polymarket's to 108.4%. A fair book sums to 100. The excess is the house's cut, paid by whoever trades, and it is the reason the same opinion costs different amounts in different places. That number is what this site is named after.
The market says 39%. It got there by making everyone who disagreed put money behind it. You do not have to, so this is the cheap version of the same question, and the interesting number is how far the two drift apart.
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What this market has cost every day since 18 January 2026, taken from the exchange's own published history. The line is the mid price, halfway between what a buyer would pay and a seller would take.
Over this window 7 went from 3.5 to 38.5, a move of 35 points toward happening.
Kalshi removes a contract from its interface once it settles and Polymarket buries closed events, so this page is the copy that stays put. We also record our own snapshot once a day, independently, because a history published by the house is worth checking against one kept by somebody with no position in it.