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Kalshi vs Polymarket on MLB games: where the prices disagree today

41 MLB games priced on both Kalshi and Polymarket right now, $271k traded in 24 hours. The widest disagreement is Milwaukee Brewers at +2.0 pp. Updated every 45 seconds.

EventOutcomeKalshiPolymarketGap (K − P)Net edge
Milwaukee Brewers vs. Cincinnati Reds
Sep 6, 12:10 PM ET
Milwaukee Brewers57¢56¢+2.0 pp-1.23¢
Atlanta Braves vs. Philadelphia Phillies
Sep 6, 1:10 PM ET
Atlanta Braves51¢49¢+2.0 pp-2.25¢
Minnesota Twins vs. Detroit Tigers
Sep 7, 3:10 PM ET
Detroit Tigers56¢54¢+3.0 pp-5.24¢
San Francisco Giants vs. New York Mets
Sep 6, 1:40 PM ET
New York Mets55¢55¢+1.0 pp-2.24¢
Cleveland Guardians vs. Baltimore Orioles
Sep 7, 1:35 PM ET
Baltimore Orioles51¢51¢-0.5 pp-7.25¢
Chicago Cubs vs. Milwaukee Brewers
Sep 7, 2:10 PM ET
Milwaukee Brewers56¢54¢+2.5 pp-5.24¢
Athletics vs. Seattle Mariners
Sep 6, 4:10 PM ET
Seattle Mariners67¢65¢+2.0 pp-3.14¢
Minnesota Twins vs. Chicago White Sox
Sep 6, 6:20 PM ET
Chicago White Sox56¢55¢+1.5 pp-3.24¢
St. Louis Cardinals vs. San Francisco Giants
Sep 7, 8:10 PM ET
San Francisco Giants52¢51¢+0.5 pp-6.25¢
Toronto Blue Jays vs. Kansas City Royals
Sep 6, 2:10 PM ET
Kansas City Royals51¢53¢-1.5 pp-3.25¢
New York Yankees vs. San Diego Padres
Sep 6, 4:10 PM ET
San Diego Padres51¢51¢-0.5 pp-5.25¢
New York Mets vs. Miami Marlins
Sep 7, 1:10 PM ET
Miami Marlins55¢53¢+1.5 pp-8.23¢
Cincinnati Reds vs. Los Angeles Dodgers
Sep 7, 9:10 PM ET
Los Angeles Dodgers61¢63¢-1.5 pp-4.18¢
San Francisco Giants vs. New York Mets
Sep 5, 4:10 PM ET
New York Mets63¢64¢-1.0 pp-3.17¢
Los Angeles Angels vs. Pittsburgh Pirates
Sep 5, 6:40 PM ET
Pittsburgh Pirates64¢64¢0.0 pp-4.17¢
Minnesota Twins vs. Chicago White Sox
Sep 5, 7:10 PM ET
Chicago White Sox53¢54¢-1.0 pp-3.25¢
Toronto Blue Jays vs. Kansas City Royals
Sep 5, 7:10 PM ET
Kansas City Royals51¢52¢-1.0 pp-3.25¢
New York Yankees vs. San Diego Padres
Sep 5, 7:15 PM ET
San Diego Padres52¢51¢+1.0 pp-3.25¢
St. Louis Cardinals vs. Colorado Rockies
Sep 5, 8:10 PM ET
St. Louis Cardinals54¢53¢+1.0 pp-3.25¢
Athletics vs. Seattle Mariners
Sep 5, 9:40 PM ET
Seattle Mariners69¢70¢-1.0 pp-3.07¢
Los Angeles Angels vs. Pittsburgh Pirates
Sep 6, 1:35 PM ET
Pittsburgh Pirates65¢66¢-1.0 pp-3.14¢
Chicago Cubs vs. Miami Marlins
Sep 6, 1:40 PM ET
Chicago Cubs56¢55¢+1.0 pp-4.24¢
Detroit Tigers vs. Cleveland Guardians
Sep 6, 1:40 PM ET
Cleveland Guardians57¢59¢-1.0 pp-4.22¢
Los Angeles Angels vs. Boston Red Sox
Sep 7, 1:35 PM ET
Boston Red Sox61¢61¢+0.5 pp-4.19¢
Arizona Diamondbacks vs. Kansas City Royals
Sep 7, 2:10 PM ET
Kansas City Royals51¢52¢-1.0 pp-8.25¢
Washington Nationals vs. San Diego Padres
Sep 7, 5:10 PM ET
San Diego Padres61¢61¢+0.5 pp-4.19¢
Arizona Diamondbacks vs. Houston Astros
Sep 6, 2:10 PM ET
Houston Astros52¢53¢-0.5 pp-5.24¢
Tampa Bay Rays vs. Texas Rangers
Sep 6, 2:35 PM ET
Tampa Bay Rays53¢52¢+0.5 pp-5.25¢
St. Louis Cardinals vs. Colorado Rockies
Sep 6, 3:10 PM ET
St. Louis Cardinals53¢53¢-0.5 pp-5.24¢
Washington Nationals vs. Los Angeles Dodgers
Sep 6, 10:10 PM ET
Los Angeles Dodgers66¢67¢-0.5 pp-4.11¢

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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