Resolution criteria on PolyGram: This market will resolve according to the winner of the Republican Primary for United States Senator from South Dakota. If no 2026 South Dakota Republican Senate Primary takes place, this market will resolve to "Other". The resolution source for this market will be the first announcement of the results from the South Dakota Republican party, however an overwhelming consensus of credible reporting may suffice.
PolyGram is an on-chain prediction market where you trade YES or NO outcome shares with real USDC on Polygon. For this market, buy YES if you believe the event will happen, or NO if you think it won't. Your maximum loss is your stake — winning shares pay $1.00 each at resolution. Unlike sportsbooks, there is no house edge: prices are set by supply and demand from other traders and reflect the crowd's real-time probability.
Market outcomes
| Justin McNeal | 3% YES | 97% NO |
| Kristi Noem | 1% YES | 99% NO |
| Person C | — | |
| Person E | — | |
| Person G | — | |
| Person I | — | |
| Person K | — | |
| Person M | — | |
South Dakota will hold a Republican primary election for its U.S. Senate seat in 2026. The current 3% implied probability on Polymarket's order book reflects a scenario where a Republican primary contest actually materialises—a contingency dependent on whether the seat becomes genuinely contested. The low probability suggests traders are pricing in either an incumbent Republican senator running unopposed or facing only token primary opposition, which would result in resolution to "Other" rather than a competitive primary winner.
Historically, South Dakota Republican primaries for statewide office have been relatively uncompetitive when incumbents seek re-election. The state's Republican lean and strong incumbent advantages mean primary challenges rarely develop into serious contests. Current Senator John Thune, first elected in 2004, has not faced meaningful primary opposition in previous cycles. Similar dynamics in neighbouring Great Plains states show that when Republican incumbents are secure, primary markets typically trade at minimal probabilities, as the event itself—a genuine contested primary—becomes the binding constraint rather than uncertainty over the winner.
Traders should monitor whether Thune announces his 2026 intentions, expected sometime in 2024 or early 2025. Any announcement of retirement or vulnerability would immediately shift market dynamics. Additionally, watch for any significant challenger recruitment efforts or grassroots primary movements, which would signal a genuine contest is forming. The South Dakota Republican Party's formal primary scheduling and candidate filing deadlines, typically occurring in early 2026, will provide concrete confirmation of whether a contested primary is actually taking place.
Resolution is handled by the UMA optimistic oracle on Polygon. A proposer submits the outcome, a two-hour dispute window opens, and if no one stakes a counter-claim the payout is final. Contested outcomes escalate to UMA token-holder voting. Payouts clear in USDC to the winning side.
The mechanics for trading "South Dakota Republican Senate Primary Winner" are the same as any other PolyGram event contract. Each YES share resolves to $1 if the event happens, or $0 if it doesn't. The current price between 0¢ and 100¢ is the market's probability estimate, set live by the order book.
$22K in lifetime turnover and $32K of resting liquidity puts this market in the around the median by volume for senate primary contracts on PolyGram. Order-book depth is strong — order books support five-figure trades with single-cent slippage.
The market has been open for 2 months — the price has had time to stabilise as new information arrived.
Higher-volume markets tend to have tighter spreads and faster price discovery — meaning the displayed YES/NO percentages are more likely to reflect the true crowd-implied probability rather than a single trader's directional view.
Resolution is handled by the UMA optimistic oracle on Polygon. A proposer submits the outcome, a 2-hour dispute window opens, and if uncontested the payout is final. Contested outcomes escalate to UMA token holders.
This prediction market is scheduled to close on 28 June 2026. After the resolving event occurs, settlement typically clears within 24 hours once the UMA optimistic oracle confirms the outcome. All payouts are in USDC on the Polygon network.
To trade on this prediction market, create a free PolyGram account at polygram.ink, deposit USDC via Polygon, and place a YES or NO order on the outcome you believe in. You can learn more on our how-it-works page. Your maximum loss is limited to your stake — there is no leverage or margin.
When the outcome is determined, winning YES shares pay out $1.00 each in USDC, while losing shares pay $0. Settlement is handled by the UMA optimistic oracle on Polygon — a proposer submits the result, a two-hour dispute window opens, and if uncontested, payouts are distributed automatically. You can withdraw your winnings to any Polygon wallet.
Prediction-market positions can lose 100% of staked capital. Outcomes are uncertain by definition — historical accuracy of crowd-implied probabilities is high in aggregate but not for any single market. PolyGram does not provide investment advice. Trade only with capital you can afford to lose.
Regulatory status varies by jurisdiction. Germany, the United States, and most EU countries treat Polymarket-style event contracts under one of three frameworks: financial derivative, gambling product, or unregulated novel asset. Consult local counsel before trading.
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