Midterm market payouts hinge on different Kalshi and Polymarket resolution rules

Election results and contract settlement are separate steps for prediction-market traders. According to Covers, Kalshi’s midterm contracts provide a media-based route to accelerated settlement, while Polymarket’s resolution process includes a standard UMA challenge period.

Kalshi’s consensus threshold

Kalshi can accelerate settlement when at least four of eight designated media sources name the same winner, provided no source makes a contradictory call, according to Covers. The threshold therefore depends on both agreement and the absence of conflicting declarations.

For Senate control, the rules also specify a fallback if no consensus emerges: the outcome follows the party of the president pro tempore on February 1, 2027, Covers explains.

Polymarket’s challenge period

Polymarket pays $1 for each winning share after resolution, according to Covers. Its process includes a standard two-hour UMA challenge window.

That window does not guarantee resolution within two hours in every case. Disputes can extend the process, making the distinction between an initial resolution proposal and a completed resolution important for payout timing.

What it means for prediction markets

• Kalshi’s media threshold has two conditions: At least four of eight designated sources must agree, and there must be no contradictory call, for accelerated settlement.
• Senate control has a dated fallback: Without consensus, the president pro tempore’s party on February 1, 2027 determines the outcome under Kalshi’s rules.
• Polymarket’s timing can change: The standard two-hour UMA challenge period can be extended by disputes; winning shares pay $1 after resolution.