Market comparison

Pro Baseball Champion

2 venues · 58 outcome rows · 2 comparable lines · event identity linked · 0 verified parity · active

Kalshi

Open venue ↗

30 outcomes · $133.6M reported volume

Observed 44s ago

Recorded venue end date: Oct 31, 2028

Polymarket

Open venue ↗

31 outcomes · $45.6M reported volume

Observed 44s ago

Recorded venue end date: Oct 31, 2026

Check settlement rules before comparing contracts. Matched outcomes may settle differently. These venues also report end dates more than 48 hours apart; event identity does not mean the contracts close or settle together. These are stored prices; record update times do not certify live quotes. Differences exclude fees and available size.

Known rule differences between venues

Both settle on the official league/organizer result for the named season; Kalshi's season is the ticker edition (KXNBA-27 = 2026-27) and Polymarket's is stated in the title or slug.
Season cancelled or not completed: Kalshi resolves per its rules (typically a fair price); Polymarket resolves to 'Other' or 50-50 depending on the event.
Polymarket lists placeholders ('Other', 'Team A') and closes eliminated outcomes early; only live named outcomes are linked.

A shared identity alone does not make a price difference executable.

Available outcome prices by venue for Pro Baseball Champion
Outcome	Kalshi	Polymarket	Difference
Milwaukee Partial parity Payoffs match in ordinary outcomes; see the rule differences above.	64.8% Bid 63.9% · Ask 64.9% Milwaukee Open Kalshi ↗	63.1% Bid 63.1% · Ask 63.2% Milwaukee Brewers Open Polymarket ↗	1.7 pp
Tampa Bay Partial parity Payoffs match in ordinary outcomes; see the rule differences above.	35.6% Bid 35.6% · Ask 36.1% Tampa Bay Open Kalshi ↗	37.0% Bid 36.9% · Ask 37.1% Tampa Bay Rays Open Polymarket ↗	1.4 pp
A's Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% A's · closed Open Kalshi ↗	—	—
Arizona Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Arizona · closed Open Kalshi ↗	—	—
Arizona Diamondbacks Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Arizona Diamondbacks · closed Open Polymarket ↗	—
Athletics Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Athletics · closed Open Polymarket ↗	—
Atlanta Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Atlanta · closed Open Kalshi ↗	—	—
Atlanta Braves Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Atlanta Braves · closed Open Polymarket ↗	—
Baltimore Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Baltimore · closed Open Kalshi ↗	—	—
Baltimore Orioles Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Baltimore Orioles · closed Open Polymarket ↗	—
Boston Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Boston · closed Open Kalshi ↗	—	—
Boston Red Sox Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Boston Red Sox · closed Open Polymarket ↗	—
Chicago C Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Chicago C · closed Open Kalshi ↗	—	—
Chicago Cubs Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Chicago Cubs · closed Open Polymarket ↗	—
Chicago White Sox Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Chicago White Sox · closed Open Polymarket ↗	—
Chicago WS Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Chicago WS · closed Open Kalshi ↗	—	—
Cincinnati Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Cincinnati · closed Open Kalshi ↗	—	—
Cincinnati Reds Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Cincinnati Reds · closed Open Polymarket ↗	—
Cleveland Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Cleveland · closed Open Kalshi ↗	—	—
Cleveland Guardians Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Cleveland Guardians · closed Open Polymarket ↗	—
Colorado Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Colorado · closed Open Kalshi ↗	—	—
Colorado Rockies Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Colorado Rockies · closed Open Polymarket ↗	—
Detroit Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Detroit · closed Open Kalshi ↗	—	—
Detroit Tigers Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Detroit Tigers · closed Open Polymarket ↗	—
Houston Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Houston · closed Open Kalshi ↗	—	—
Houston Astros Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Houston Astros · closed Open Polymarket ↗	—
Kansas City Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Kansas City · closed Open Kalshi ↗	—	—
Kansas City Royals Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Kansas City Royals · closed Open Polymarket ↗	—
Los Angeles Angels Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Los Angeles A · closed Open Kalshi ↗	—	—
Los Angeles Angels Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Los Angeles Angels · closed Open Polymarket ↗	—
Los Angeles D Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Los Angeles D · closed Open Kalshi ↗	—	—
Los Angeles Dodgers Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Los Angeles Dodgers · closed Open Polymarket ↗	—
Miami Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Miami · closed Open Kalshi ↗	—	—
Miami Marlins Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Miami Marlins · closed Open Polymarket ↗	—
Minnesota Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Minnesota · closed Open Kalshi ↗	—	—
Minnesota Twins Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Minnesota Twins · closed Open Polymarket ↗	—
New York M Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% New York M · closed Open Kalshi ↗	—	—
New York Mets Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% New York Mets · closed Open Polymarket ↗	—
New York Y Not aligned No persisted outcome identity connects these venue contracts.	0.3% Bid 0.0% · Ask 100.0% New York Y · closed Open Kalshi ↗	—	—
New York Yankees Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% New York Yankees · closed Open Polymarket ↗	—
Philadelphia Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Philadelphia · closed Open Kalshi ↗	—	—
Philadelphia Phillies Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Philadelphia Phillies · closed Open Polymarket ↗	—
Pittsburgh Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Pittsburgh · closed Open Kalshi ↗	—	—
Pittsburgh Pirates Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Pittsburgh Pirates · closed Open Polymarket ↗	—
San Diego Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% San Diego · closed Open Kalshi ↗	—	—
San Diego Padres Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% San Diego Padres · closed Open Polymarket ↗	—
San Francisco Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% San Francisco · closed Open Kalshi ↗	—	—
San Francisco Giants Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% San Francisco Giants · closed Open Polymarket ↗	—
Seattle Not aligned No persisted outcome identity connects these venue contracts.	0.2% Bid 0.0% · Ask 100.0% Seattle · closed Open Kalshi ↗	—	—
Seattle Mariners Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Seattle Mariners · closed Open Polymarket ↗	—
St. Louis Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% St. Louis · closed Open Kalshi ↗	—	—
St. Louis Cardinals Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% St. Louis Cardinals · closed Open Polymarket ↗	—
Texas Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Texas · closed Open Kalshi ↗	—	—
Texas Rangers Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Texas Rangers · closed Open Polymarket ↗	—
Toronto Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Toronto · closed Open Kalshi ↗	—	—
Toronto Blue Jays Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Toronto Blue Jays · closed Open Polymarket ↗	—
Washington Not aligned No persisted outcome identity connects these venue contracts.	0.1% Bid 0.0% · Ask 100.0% Washington · closed Open Kalshi ↗	—	—
Washington Nationals Not aligned No persisted outcome identity connects these venue contracts.	—	0.0% Bid — · Ask 0.1% Washington Nationals · closed Open Polymarket ↗	—

Milwaukee

Partial parity

Payoffs match in ordinary outcomes; see the rule differences above.

Kalshi

64.8%

Bid 63.9% · Ask 64.9%

Milwaukee

Open Kalshi ↗

Polymarket

63.1%

Bid 63.1% · Ask 63.2%

Milwaukee Brewers

Open Polymarket ↗

Price difference 1.7 pp

Tampa Bay

Partial parity

Payoffs match in ordinary outcomes; see the rule differences above.

Kalshi

35.6%

Bid 35.6% · Ask 36.1%

Tampa Bay

Open Kalshi ↗

Polymarket

37.0%

Bid 36.9% · Ask 37.1%

Tampa Bay Rays

Open Polymarket ↗

Price difference 1.4 pp

A's

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

A's · closed

Open Kalshi ↗

Polymarket

—

Arizona

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Arizona · closed

Open Kalshi ↗

Polymarket

—

Arizona Diamondbacks

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Arizona Diamondbacks · closed

Open Polymarket ↗

Athletics

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Athletics · closed

Open Polymarket ↗

Atlanta

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Atlanta · closed

Open Kalshi ↗

Polymarket

—

Atlanta Braves

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Atlanta Braves · closed

Open Polymarket ↗

Baltimore

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Baltimore · closed

Open Kalshi ↗

Polymarket

—

Baltimore Orioles

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Baltimore Orioles · closed

Open Polymarket ↗

Boston

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Boston · closed

Open Kalshi ↗

Polymarket

—

Boston Red Sox

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Boston Red Sox · closed

Open Polymarket ↗

Chicago C

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Chicago C · closed

Open Kalshi ↗

Polymarket

—

Chicago Cubs

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Chicago Cubs · closed

Open Polymarket ↗

Chicago White Sox

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Chicago White Sox · closed

Open Polymarket ↗

Chicago WS

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Chicago WS · closed

Open Kalshi ↗

Polymarket

—

Cincinnati

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Cincinnati · closed

Open Kalshi ↗

Polymarket

—

Cincinnati Reds

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Cincinnati Reds · closed

Open Polymarket ↗

Cleveland

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Cleveland · closed

Open Kalshi ↗

Polymarket

—

Cleveland Guardians

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Cleveland Guardians · closed

Open Polymarket ↗

Colorado

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Colorado · closed

Open Kalshi ↗

Polymarket

—

Colorado Rockies

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Colorado Rockies · closed

Open Polymarket ↗

Detroit

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Detroit · closed

Open Kalshi ↗

Polymarket

—

Detroit Tigers

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Detroit Tigers · closed

Open Polymarket ↗

Houston

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Houston · closed

Open Kalshi ↗

Polymarket

—

Houston Astros

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Houston Astros · closed

Open Polymarket ↗

Kansas City

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Kansas City · closed

Open Kalshi ↗

Polymarket

—

Kansas City Royals

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Kansas City Royals · closed

Open Polymarket ↗

Los Angeles Angels

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Los Angeles A · closed

Open Kalshi ↗

Polymarket

—

Los Angeles Angels

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Los Angeles Angels · closed

Open Polymarket ↗

Los Angeles D

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Los Angeles D · closed

Open Kalshi ↗

Polymarket

—

Los Angeles Dodgers

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Los Angeles Dodgers · closed

Open Polymarket ↗

Miami

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Miami · closed

Open Kalshi ↗

Polymarket

—

Miami Marlins

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Miami Marlins · closed

Open Polymarket ↗

Minnesota

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Minnesota · closed

Open Kalshi ↗

Polymarket

—

Minnesota Twins

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Minnesota Twins · closed

Open Polymarket ↗

New York M

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

New York M · closed

Open Kalshi ↗

Polymarket

—

New York Mets

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

New York Mets · closed

Open Polymarket ↗

New York Y

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.3%

Bid 0.0% · Ask 100.0%

New York Y · closed

Open Kalshi ↗

Polymarket

—

New York Yankees

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

New York Yankees · closed

Open Polymarket ↗

Philadelphia

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Philadelphia · closed

Open Kalshi ↗

Polymarket

—

Philadelphia Phillies

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Philadelphia Phillies · closed

Open Polymarket ↗

Pittsburgh

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Pittsburgh · closed

Open Kalshi ↗

Polymarket

—

Pittsburgh Pirates

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Pittsburgh Pirates · closed

Open Polymarket ↗

San Diego

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

San Diego · closed

Open Kalshi ↗

Polymarket

—

San Diego Padres

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

San Diego Padres · closed

Open Polymarket ↗

San Francisco

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

San Francisco · closed

Open Kalshi ↗

Polymarket

—

San Francisco Giants

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

San Francisco Giants · closed

Open Polymarket ↗

Seattle

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.2%

Bid 0.0% · Ask 100.0%

Seattle · closed

Open Kalshi ↗

Polymarket

—

Seattle Mariners

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Seattle Mariners · closed

Open Polymarket ↗

St. Louis

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

St. Louis · closed

Open Kalshi ↗

Polymarket

—

St. Louis Cardinals

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

St. Louis Cardinals · closed

Open Polymarket ↗

Texas

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Texas · closed

Open Kalshi ↗

Polymarket

—

Texas Rangers

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Texas Rangers · closed

Open Polymarket ↗

Toronto

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Toronto · closed

Open Kalshi ↗

Polymarket

—

Toronto Blue Jays

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Toronto Blue Jays · closed

Open Polymarket ↗

Washington

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

0.1%

Bid 0.0% · Ask 100.0%

Washington · closed

Open Kalshi ↗

Polymarket

—

Washington Nationals

Not aligned

No persisted outcome identity connects these venue contracts.

Kalshi

—

Polymarket

0.0%

Bid — · Ask 0.1%

Washington Nationals · closed

Open Polymarket ↗

Prices are shown as percentages of a $1 payout. “pp” means percentage points. A dash means data is unavailable.

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