Polymarket vs. Kalshi
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See where the two biggest prediction markets disagree. Pick any two markets, or start from the biggest gaps below: prices, volume, history and the resolution rules, side by side.
Will Kyrie Irving announce his retirement before the 2028-29 NBA season?
Vol $0 today · $487 total
Kalshi is 1 points higher than Polymarket (21% vs 20%). They resolve on different dates (Nov 15 vs Oct 29), so they may not be exactly the same bet.
History starts when we first saw each market, so a newly added market has a short line.
| Kalshi | Polymarket | |
|---|---|---|
| Probability (Yes) | 21% | 20% |
| Change (24h) | +0.0 pt | -30.0 pt |
| Volume today | $0 | $1.1K |
| Total volume | $487 | $1.1K |
| Liquidity | — | $1.5K |
| Open interest | $406 | — |
| Resolves | 25mo | 5h |
| Tracked for | 19 days | 7 hours |
Resolution rules: read both before trusting a gap
Kalshi
If Kyrie Irving announces his retirement from the NBA before the 2028-29 NBA season start date, then the market resolves to Yes.
Polymarket
In the upcoming NBA game, scheduled for October 28 at 9:30 PM ET: This market will resolve to "Yes" if Kyrie Irving records more than 3.5 total rebounds during the game. This market will resolve to "No" if Kyrie Irving records 3.5 rebounds or fewer during the game. The entire game including all overtime periods will be considered. If the game is postponed, this market will remain open until the game has been completed. If the game is canceled entirely, with no make-up game, this market will resolve 50-50. If the player is listed as inactive or otherwise does not take the court at any point, the market will resolve "No". The resolution source will be the official NBA box score as published on NBA.com.
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Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.