Kalshi vs Polymarket on World Series futures: where the prices disagree today
1 World Series futures priced on both Kalshi and Polymarket right now, $621k traded in 24 hours. The widest disagreement is New York Yankees at +1.6 pp. Updated every 45 seconds.
| Event | Outcome | Kalshi | Polymarket | Gap (K − P) | Net edge | |
|---|---|---|---|---|---|---|
| MLB World Series Champion 2026 Oct 31, 7:55 PM ET | New York Yankees | 11¢ | 10¢ | +1.6 pp | — | Kalshi · Polymarket |
How this is built
Every event listed on both exchanges is matched outcome by outcome: games by team codes and date, multi-outcome markets by name. Prices are mid-market: Polymarket from its live order book, Kalshi from its public API. Gap is Kalshi minus Polymarket in percentage points. Thin books (spread over 10¢) and near-certain favorites are excluded from this table.
Net edge
Buy one side on one venue and the other side on the other, both at the ask. Edge is $1 minus total cost minus taker fees, Kalshi ⌈0.07·P·(1−P)⌉ per contract and Polymarket 0.05·P·(1−P) on sports. Not advice; nothing here places orders.
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