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Seattle spread leads Week 8 pricing differences across prediction venues

PredictionMarketsPicks, updated November 2, ranks the same-contract price gaps between Kalshi and Polymarket US for Week 8 and puts the Bears at Seahawks spread on top, with Seattle minus 3.5 at 49.7 cents on Kalshi against 48.2 cents on Polymarket US after fees. The next widest gaps are 1.1 cents, on Bears first touchdown scorer markets including Roschon Johnson and Rome Odunze.

Seattle minus 3.5 in the Bears at Seahawks matchup has the largest same-contract price difference between Kalshi and Polymarket US in a Week 8 ranking from PredictionMarketsPicks, updated November 2.

The spread contract is priced at 49.7 cents on Kalshi versus 48.2 cents on Polymarket US after fees, according to PredictionMarketsPicks. Those figures imply a 1.5-cent difference between the venues.

Touchdown markets follow the spread

The next-largest differences are 1.1 cents in Bears first touchdown scorer markets, including contracts involving Roschon Johnson and Rome Odunze, according to PredictionMarketsPicks.

The supplied summary does not give individual venue prices for those scorer contracts or identify which platform has the higher price. Its clearest side-by-side comparison is therefore the Seattle minus 3.5 spread.

What it means for prediction markets

  • Venue pricing differs: The Seattle contract shows a 1.5-cent after-fee gap for the same outcome across Kalshi and Polymarket US.
  • The ranking is comparative: Seattle minus 3.5 leads the reported Week 8 list, followed by 1.1-cent gaps in Bears first touchdown scorer contracts.
  • Execution remains unaddressed: The summary provides no available trade sizes or liquidity details, so the quoted differences alone do not establish whether matching trades could be completed at those prices.
KalshiPolymarketInfiniti MarketsInfiniti Signals

Sources & attribution

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    PredictionMarketsPicks
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