Market comparison

Massachusetts Governor winner?

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

Kalshi

Open venue ↗

2 outcomes · $1.7M reported volume

Observed 45s ago

Recorded venue end date: Nov 3, 2027

Polymarket

Open venue ↗

13 outcomes · $126K reported volume

Observed 4m ago

Recorded venue end date: Nov 4, 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

Kalshi settles on the party of the officeholder sworn in/inaugurated for the new term; Polymarket settles on the party of the called winner. They differ if the winner dies, withdraws or is not seated before the term starts.
Independents: Polymarket assigns a non-affiliated winner by stated caucus (House) or excludes independents from party options (Senate/Governor); Kalshi requires party membership.
Kalshi may close early on a media-consensus projection; Polymarket resolves on consensus calls with certification as the fallback.

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

Available outcome prices by venue for Massachusetts Governor winner?
Outcome	Kalshi	Polymarket	Difference
Democratic Partial parity Payoffs match in ordinary outcomes; see the rule differences above.	96.2% Bid 96.1% · Ask 96.4% Maura Healey Open Kalshi ↗	96.4% Bid 95.7% · Ask 97.1% Maura Healey (D) Open Polymarket ↗	0.2 pp
Republican Partial parity Payoffs match in ordinary outcomes; see the rule differences above.	4.2% Bid 3.6% · Ask 4.2% Mike Minogue Open Kalshi ↗	3.7% Bid 3.1% · Ask 4.3% Michael Minogue (R) Open Polymarket ↗	0.5 pp