MO-01 Democratic Primary Winner

Platform comparison

Market context

The Missouri 1st District Democratic primary is set for 4 August 2026, and the market’s **66% YES** price makes the frontrunner a clear favourite but not a lock. On the latest crowd read, that puts the other side at roughly **34%** implied, so the consensus is for a Bell win but with enough uncertainty that a late swing is still plausible.[1][2][6]

The handicapping frame is a familiar one: a high-salience rematch in a safely Democratic seat, where turnout rather than persuasion often decides the result. Recent market and polling signals have not fully agreed, with one poll cited in the market blurb showing Wesley Bell ahead 44-40 among likely Democratic voters, while the live order book has recently swung around both candidates, reflecting how thin margins can be in low-turnout primaries.[1][4][8] That makes the favourite’s price look broadly reasonable, but not especially cheap if you think grassroots mobilisation for Cori Bush is being undercounted.

Catalysts to watch are late endorsements, fresh polling, turnout cues, and any schedule changes or procedural issues before polling day. The market itself points to Bell’s fundraising strength and the possibility of outside spending as key dependencies, while recent coverage has highlighted a more favourable run for Bell in trader sentiment.[1][2] Because the settlement source is a Democratic consensus by the November deadline, the main trader risk is not a post-primary substitution but whether the nominal winner is clear on the night or drifts into contested-certification territory.[1][6]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track MO-01 Democratic Primary Winner across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.