Iran Truce Odds Dip to 84.5% Before US Vote

Prediction Markets: World

Traders now give 84.5% odds that the United States will not strike Iran before the 3 November midterm elections, the vote for Congress. A day earlier the same bet stood 7.0 points higher, and at 6:07 p.m. ET on our own board it dipped as low as 70%.

The bet matters to US readers because a new round of fighting would reach oil prices, markets and travel to the Gulf region within hours. It also lands in the final days of a US election campaign.

Prices are real-money bets, not polls and not a forecast by The Rio Times. No strike has been announced or confirmed.

What Prediction Markets Say

Polymarket, an online platform where users trade real money on outcomes, runs a market called “US-Iran ceasefire continues through the midterms?” It resolves “No” if the United States carries out an air strike or a missile strike that hits Iran by 11:59 p.m. ET on 3 November 2026. Otherwise it resolves “Yes”.

Prices at 6:29 p.m. ET on 29 October 2026:

• Yes (no US strike by 3 November): 84.5%, down 7.0 points in 24 hours and up 11.0 points in 7 days
• No (a US strike by 3 November): 15.5%

Polymarket also lists the same question for later end dates, with deadlines in Iran Standard Time:

• 31 October: 87.1%
• 2 November: 86.0%
• 8 November: 68.5%
• 15 November: 48.0%
• 30 November: 34.5%
• 31 December: 23.5%

The midterm market has traded about US$1.62 million since it opened and about US$141,000 in the last 24 hours. That is thinly traded, so a few large bets can move the price. All the dated markets together have traded about US$29.6 million.

We found no matching market on Kalshi, a prediction-market exchange regulated in the US by the CFTC (the Commodity Futures Trading Commission, the federal derivatives regulator).

Why we show this: prediction markets turn real-money bets into a live probability that moves within minutes of the news, which is why investors, campaigns and newsrooms in the United States now follow them closely. We show them next to polls and official results, never instead of them.

Why the Odds Moved

The move followed a report on 28 October. Two unnamed diplomats said that US officials told several Middle East countries and regional allies to be prepared for possible renewed military action against Iran after the midterms.

The diplomats, who were not authorised to comment publicly, said a new round could last several days and that Iran might retaliate. They also said President Donald Trump had not made a final decision. We could not confirm the warning with a named official, and it is not known whether it drove the trading.

Read closely, that report points to the period after election day, not before it. Our daily snapshots show the “Yes” price between about 66% and 94% since 21 October, so the latest fall sits inside a choppy week.

The timing fits, but traders do not state their reasons, so we cannot say what they reacted to.

What the Bet Does and Does Not Cover

The rules count only air strikes and missile strikes started by the United States that hit Iran. Ground operations, cyber attacks, naval fire, intercepted munitions and anti-aircraft fire do not trigger a “No”.

So an 84.5% “Yes” is not a bet on peace. It is a bet on whether the US itself attacks in the next few days.

What It Means for US Readers

Oil is the first channel. Fresh fighting involving Iran would be watched through fuel prices, energy shares and shipping costs, and our earlier reports on a 17-point drop in ceasefire odds and falling Israel-Iran ceasefire odds show how quickly these prices swing.

Politics is the second. Traders are pricing a quiet campaign finish and a harder choice afterwards, which is why the longer dates fall so steeply, from 86.0% on 2 November to 48.0% on 15 November.

Diplomacy is the third. Our report on odds of who attends US-Iran talks covers the separate market on negotiations. More markets are on our prediction markets hub.

What It Means for Latin America and Africa

Oil exporters in both regions usually gain when crude rises, and importers pay more for fuel and freight. That applies to producers such as Brazil, Colombia, Nigeria and Angola on one side and to fuel importers such as Kenya on the other.

We have no confirmed price move to report, because no strike has happened. Readers who follow these countries can find the regional markets on our Latin America odds page and our Africa odds page.

What Is Not Known

It is not known whether the US plans any action, and no named official has confirmed the warning to allies. We also do not know who bet on 29 October or why.

A thin market can move on a few large trades, and the price read 70% and then 84.5% within about 20 minutes on our own checks. Treat the number as a mood gauge, not a prediction.

Frequently Asked Questions

What do prediction markets say about a US strike on Iran?

Polymarket gives 84.5% that the US does not strike Iran by 3 November 2026, 11:59 p.m. ET, down 7.0 points in 24 hours (6:29 p.m. ET, 29 October). These prices are bets, not polls.

Why did the odds fall?

The drop followed a 28 October report. Two unnamed diplomats said US officials told regional allies to prepare for possible action after the midterms, but no named official confirmed it.

Does 84.5% mean a strike is unlikely?

It means traders see a 15.5% chance of a US strike by election night. A thin market can swing, and the price touched 70% earlier on 29 October.

When do the midterm elections take place?

The US midterm elections are on Tuesday, 3 November 2026. The market closes at 11:59 p.m. ET that night.

What would a US-Iran conflict mean for oil?

Higher crude prices usually help oil exporters and hurt importers. We cannot say how far prices would move, and no strike has been confirmed.

Sources: Polymarket and Kalshi public market data (read 29 October 2026, 6:29 p.m. ET); Polymarket market rules for “US-Iran ceasefire continues through the midterms?”; reporting from two unnamed diplomats, 28 October 2026. Prediction market prices are bets, not polls.