MLB odds on Kalshi vs Polymarket
Baseball moneylines and run totals, Kalshi against Polymarket. Right now there are 307 open MLB markets — 298 on Kalshi, 9 on Polymarket — carrying $6.7M of volume in the last 24 hours.
Open MLB markets, by volume
| Market | Venue | Yes | 24h volume | Closes |
|---|---|---|---|---|
| Seattle vs Los Angeles A — Seattle | kalshi | 98¢ | $3.5M | 09-17 04:38 UTC |
| Miami vs Arizona — Miami | kalshi | 88¢ | $1.6M | 09-17 04:40 UTC |
| Miami vs Arizona — Arizona | kalshi | 13¢ | $290k | 09-17 04:40 UTC |
| Seattle vs Los Angeles A: Total Runs — Over 8.5 runs scored | kalshi | 100¢ | $283k | 09-17 04:38 UTC |
| Seattle vs Los Angeles A: Total Runs — Over 7.5 runs scored | kalshi | 100¢ | $214k | 09-17 04:38 UTC |
| Seattle vs Los Angeles A: Total Runs — Over 9.5 runs scored | kalshi | 59¢ | $176k | 09-17 04:38 UTC |
| Miami vs Arizona: Total Runs — Over 8.5 runs scored | kalshi | 18¢ | $110k | 09-17 04:40 UTC |
| Seattle vs Los Angeles A: Total Runs — Over 10.5 runs scored | kalshi | 36¢ | $82k | 09-17 04:38 UTC |
| Seattle vs Los Angeles A — Los Angeles A | kalshi | 3¢ | $63k | 09-17 04:38 UTC |
| Seattle vs Los Angeles A: Total Runs — Over 4.5 runs scored | kalshi | 100¢ | $62k | 09-17 04:38 UTC |
| Seattle vs Los Angeles A: Total Runs — Over 11.5 runs scored | kalshi | 20¢ | $61k | 09-17 04:38 UTC |
| Seattle vs Los Angeles A: Total Runs — Over 6.5 runs scored | kalshi | 100¢ | $42k | 09-17 04:38 UTC |
| Seattle vs Los Angeles A: Total Runs — Over 5.5 runs scored | kalshi | 100¢ | $37k | 09-17 04:38 UTC |
| Miami vs Arizona: Total Runs — Over 7.5 runs scored | kalshi | 19¢ | $34k | 09-17 04:40 UTC |
| Miami vs Arizona: Total Runs — Over 9.5 runs scored | kalshi | 7¢ | $33k | 09-17 04:40 UTC |
| Miami vs Arizona: Total Runs — Over 6.5 runs scored | kalshi | 56¢ | $30k | 09-17 04:40 UTC |
| Seattle vs Los Angeles A: Total Runs — Over 12.5 runs scored | kalshi | 11¢ | $21k | 09-17 04:38 UTC |
| Miami vs Arizona: Total Runs — Over 5.5 runs scored | kalshi | 100¢ | $19k | 09-17 04:40 UTC |
| San Diego vs Colorado — San Diego | kalshi | 61¢ | $15k | 09-17 22:10 UTC |
| Los Angeles D vs Cincinnati — Los Angeles D | kalshi | 61¢ | $13k | 09-17 19:40 UTC |
The 20 most active of 307, by 24h volume across both venues, refreshed every few minutes. A market listed on only one venue has no cross-venue price to compare against — which is true of most of them.
What two venues' prices are worth
A gap between Kalshi and Polymarket on the same MLB market is usually fees, depth, or two contracts that settle differently — not free money. The arbitrage guide shows today's gaps before and after fees, and the fee page shows why the cost peaks near 50¢.
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