Predictions.io finds narrow price differences across matched Polymarket and Kalshi questions
Predictions.io said 74 of its closest matched questions carried a price on both venues synced within the last 60 minutes, and only 4 percent showed a gap of 5 cents or more. It tracked 2,929 open Polymarket questions and 6,436 open Kalshi questions.
Predictions.io tracked 1,623 validated question matches between Polymarket and Kalshi as of October 31, 2026, with an average price difference of 1.8 cents, according to Predictions.io.
Cross-venue coverage
The figures, published October 31, 2026, at 6:00 PM ET, covered a broader universe of 2,929 open Polymarket questions and 6,436 open Kalshi questions.
The validated matches provide a basis for comparing questions across the two venues. The reported number of matches is distinct from the total number of open questions tracked on either platform.
Recently synchronized prices
According to Predictions.io, 74 of its closest matched questions had prices on both venues synchronized within the preceding 60 minutes. Only 4 percent of that group showed a price difference of 5 cents or more.
That recent-price subset is narrower than the full set of 1,623 validated matches. The summary does not provide individual question details or explain the matching criteria, limiting conclusions about particular comparisons.
What it means for prediction markets
- The reported average gap of 1.8 cents points to relatively close pricing across the validated matches, but does not describe every pair.
- Among the 74 closest matches with recently synchronized prices, gaps of at least 5 cents were uncommon, at 4 percent.
- Matching coverage and price freshness are separate measures: a validated question match does not, by itself, establish that both prices were synchronized within the last 60 minutes.
Sources & attribution
- Published
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- Predictions.iopredictions.io
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- https://predictions.io
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