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Polymarket US edges Kalshi on NFL Week 9 costs after fees

PredictionMarketPicks compared the 15 NFL Week 9 games listed on both venues on the evening of November 4, pricing each side as the best ask plus that venue's taker fee. Kalshi was cheaper on 2 sides, and the widest gap was the Los Angeles Chargers at 34.28 cents all-in on Polymarket US against 35.57 cents on Kalshi, 1.3 cents apart.

PredictionMarketPicks found that Polymarket US offered lower all-in prices than Kalshi on 12 of 30 NFL Week 9 sides, while 16 sides cost the same across the two venues. Kalshi had the lower price on 2 sides.

The comparison covered the 15 NFL Week 9 games available on both platforms on the evening of November 4. The findings were published on Nov 4, 2026, at 10:15 PM ET.

Comparing prices after taker fees

According to PredictionMarketPicks, each side was priced using the best ask plus the relevant venue’s taker fee. The comparison therefore measured the cost of taking an available offer, rather than the displayed ask alone.

The largest difference was for the Los Angeles Chargers: 34.28 cents all-in on Polymarket US versus 35.57 cents on Kalshi. PredictionMarketPicks described that gap as 1.3 cents.

What it means for prediction markets

  • Fees matter to comparisons: The findings reflect the best ask plus taker fees, making the fee-inclusive price the relevant benchmark.
  • Most sides were tied: Equal pricing on 16 of 30 sides meant Polymarket US’s cost advantage was not universal; Kalshi was cheaper on 2 sides.
  • The scope is specific: These results describe the 15 shared NFL Week 9 games on the evening of November 4, not a broader or ongoing pricing advantage.
KalshiPolymarketNFLInfiniti MarketsInfiniti Signals

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