Same Senate Question, Two Different Answers
Ask two exchanges who wins the Senate and you get two different races. Kalshi prices Democratic Senate control at 71 cents, and its balance-of-power contract puts a Democratic sweep at 70 cents. On Polymarket US, the same Senate question trades at 47%.
A 24-point gap on the cycle's biggest question is not a rounding error. The venues run different books with different crowds: Kalshi's midterm complex counts 311 tradeable contracts and tens of millions in open interest, while the Polymarket US Senate market traded just $77K in the last 24 hours.
Thin books price noisily. A $77K day can be moved by a handful of orders, while Kalshi's price is set by a crowd that has been building positions for months. When two prices disagree this much, the deeper market is usually the one quoting information; the thinner one is quoting whoever showed up today.
Election night will grade both. Until then, the gap itself is the data point: it measures how much of the prediction-market map is deep water and how much is still a puddle.
Sources: DeFi Rate
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