Trade: Iowa Senate Election Winner
Resolution criteria on PolyGram: This market will resolve according to the winner of the 2026 midterm Iowa U.S. Senate election, inclusive of any run-offs. A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date. Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party. The resolution source for this market is the Associated Press, Fox News, and NBC.
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.
- Liquidity
- $39K
- Total Volume
- $115K
- 24h Volume
- $128
- Open Interest
- $37K
Market outcomes
| Person A | — | |
| Person E | — | |
| Person I | — | |
| Democrat | 40% YES | 61% NO |
| Person C | — | |
| Person G | — | |
| Other | — | |
| Republican | 61% YES | 40% NO |
Market context
Iowa will hold a U.S. Senate election in November 2026 to determine which party controls one of the chamber's seats currently held by Republican Chuck Grassley, who announced in 2022 he would not seek re-election. The race will determine representation for a state that has shifted rightward in recent election cycles, with Republicans winning statewide races by increasing margins through 2020 and 2022. The settlement window closes on 3 November 2026, with resolution determined by Associated Press calls and inclusive of any runoff scenarios, though Iowa does not employ runoff procedures for federal elections.
Historical context suggests Iowa Senate races have become increasingly competitive along partisan lines. In 2020, Republican Joni Ernst won re-election with 52 per cent of the vote against a well-funded Democratic challenger. The 2022 midterms saw Republicans gain ground nationally, and Iowa followed this pattern. Current market pricing will reflect expectations about candidate quality, national political environment shifts between now and 2026, and demographic trends in the state. Early candidate announcements and primary contests in both parties will provide material information for traders assessing the probability distribution.
Key catalysts include formal candidate declarations, which typically accelerate through 2025 and into 2026, alongside national political developments that affect Senate races. Polling data released throughout the cycle will offer direct signals about head-to-head matchups. The order book on Polymarket will aggregate trader assessments as these events unfold, with implied probabilities shifting as new information becomes available and as the election approaches.
Wikipedia Context
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2010 Iowa Senate electionThe 2010 Iowa State Senate elections took place as part of the biennial 2010 United States elections. Iowa voters elected state senators in half of the state senate's districts—the 25 odd-numbered state senate districts. State senators serve four-year terms in the Iowa State Senate, with half of the seats up for election each cycle.
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2006 Iowa Senate electionThe 2006 Iowa Senate election was held on November 7, 2006. The Senate seats for the twenty-five odd-numbered districts were up for election. Senate terms are staggered such that half the membership is elected every two years. Senators serve four-year terms. Prior to the election, the Senate was evenly divided between Republicans and Democrats. Following the
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2014 Iowa Senate electionThe 2014 Iowa Senate election was held on November 4, 2014. The Senate seats for the twenty-five odd-numbered districts were up for election. Senate terms are staggered such that half the membership is elected every two years, with each senator serving a four-year term. Prior to the election, the Democrats were in the majority. They kept this majority after
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2008 Iowa Senate electionThe 2008 Iowa Senate election were held on November 4, 2008. The Senate seats for the twenty-five even-numbered districts were up for election. Senate terms are staggered such that half the membership is elected every two years, with each Senators serving a four-year term. Prior to the election, the Democrats were in the majority - marking the first time in
How this market resolves
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.
How to trade this market step by step
The mechanics for trading "Iowa Senate Election 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.
- Sign in on polygram.ink with your email — no full KYC under $1,500 lifetime trading volume.
- Deposit USDC on Polygon (lowest fees, ~$0.01 per transaction) or Ethereum. Funds credit after 12 confirmations.
- Pick a side. Buy YES if you believe the event will happen; buy NO if you think it won't. The current YES price reflects the market's collective probability.
- Size your position. If you stake 100 USDC at 50% YES, you'll receive shares that pay $200 if YES resolves true — a 100% gross return. If NO resolves, your shares are worth $0.
- Set risk controls (optional). Stop-loss, take-profit, and limit-order types all supported. Use the trade ticket's slippage box to cap your maximum entry price.
- Wait for resolution. When the event resolves on-chain via the UMA optimistic oracle, the winning side settles to 100¢ automatically and USDC hits your balance within seconds. Withdrawable to any wallet you control.
How active is this market?
$115K in lifetime turnover and $39K of resting liquidity puts this market in the top 30% by volume for us presidential election contracts on PolyGram. Order-book depth is strong — order books support five-figure trades with single-cent slippage.
Last 24 hours alone saw $128 in turnover, consistent with the market's lifetime daily-average pace.
The market has been open for 7 months — long enough that the order book is mature and price is well-anchored to fundamentals.
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.
Key terms
- YES / NO share
- A binary outcome token that pays $1.00 if the underlying claim resolves true (YES) or false (NO), and $0 otherwise. The market price between 0¢ and 100¢ is the implied probability.
- CLOB
- Central limit order book. The matching engine that pairs YES buyers with NO buyers (effectively the same trade). Polymarket's CLOB on Polygon executes trades on-chain via the conditional-tokens framework.
- Liquidity
- USDC capital sitting in resting limit orders inside the order book. Deeper liquidity means smaller slippage on large trades and a tighter bid-ask spread.
- UMA optimistic oracle
- The on-chain dispute system that settles each Polymarket market. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution.
- Slippage
- The difference between the displayed mid-price and your fill price. Affects market orders most; limit orders avoid slippage but may take time to fill.
- Conditional token
- ERC-1155 outcome share issued by Gnosis Conditional Tokens on Polygon. The token type that resolves to $1.00 or $0.00 at settlement.
Frequently asked questions
How does this market resolve?
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.
When does this market close?
This prediction market is scheduled to close on 3 November 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.
How can I trade on "Iowa Senate Election Winner"?
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.
What happens when the market resolves?
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.
Risk and regulatory note
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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