Traders certain the U.S.-Iran ceasefire continues through October 31

Traders now treat it as certain that the United States avoided a qualifying air or missile strike on Iranian territory through October 31. The outcome has not been officially confirmed. The deadline passed late Saturday night in Iran, and resolution still depends on official U.S. and Iranian information and credible reporting.

The likely reason for the final climb is the narrowing window. Reuters reported Saturday that President Donald Trump had held off on strikes in the weeks before the November 3 midterm elections, while Iranian and Qatari negotiators continued talks. That report came before the deadline and does not by itself establish what happened through the end of the period.

The question is narrow. It asks only whether the United States launched an air strike or surface-to-surface missile strike that directly hit Iran's land territory or internal waters. Intercepted munitions, strikes at sea, minor strikes and unexecuted threats do not count. A broader peace agreement is not required, and none has been announced.

Expectations were firm before a volatile stretch. Bets on the truce holding were all but certain through Wednesday, then plunged sharply on Thursday and Friday, at the lowest points falling to unlikely, before rebounding within hours. No sourced explanation for that drop and rebound has been found. Confidence then rose steadily through Saturday, moving from all but certain to certain.

The background helps explain the swings. The United States and Israel attacked Iran on February 28. An April ceasefire and a June memorandum did not produce a lasting settlement, fighting resumed, and the memorandum expired in August. On October 8, Trump said the United States would not resume strikes before the midterms, and the Associated Press reported on October 28 that Washington had warned regional allies to prepare for possible strikes and retaliation after the election. Trump had not made a final decision.

Iranian negotiators met Qatari mediators in Doha on Saturday, a day after more than 12 hours of talks in Tehran.

Longer-range expectations are much weaker. A truce lasting through early November looks likely, but one lasting through mid-November is a toss-up, and traders consider a ceasefire lasting through the end of November or December unlikely. Traders' central expectation for how long the truce lasts is mid-November, within a range running from early November to after December 31.

What comes next depends on confirmation and on the election. Official statements or credible reporting of a late-disclosed strike could still determine how the question resolves. The November 3 midterms are the next date to watch, given the warnings about possible action afterward.