US captures Iranian vessel in Gulf of Oman; Tehran threatens retaliation

The US captured an Iranian vessel in the Gulf of Oman, and Tehran has threatened retaliation. The ceasefire-by-April-30 market sits at 33% YES, down from 59% yesterday.

Market reaction

The drop in ceasefire odds has coincided with stagnation in related markets. Odds for a diplomatic meeting by June 30 sit at 3.7% YES, showing almost no confidence in a near-term diplomatic outcome. The probability of Trump agreeing to Iranian oil sanction relief by April 30 is at 31.2% YES.

The ceasefire market saw $80,435 in USDC traded over the past 24 hours, with $1,566 needed to shift prices by 5 points. That’s a relatively thick book where large orders move prices but don’t dominate them. The biggest single move was a 4-point drop at 5:27 PM, consistent with bearish positioning after the news broke. The diplomatic meeting market is far thinner, with just $399 in USDC traded.

Why it matters

This is a sharp escalation, comparable to prior incidents like Operation Epic Fury, and it makes any ceasefire talks within the next 12 days much harder to imagine. A YES share at 33¢ pays $1 if resolved, a 2.63x return. But that payout only makes sense if you believe a diplomatic resolution can materialize in under two weeks, with both sides actively escalating.

What to watch

Any shift in rhetoric from Trump, Rubio, or the IRGC. CENTCOM’s next operational move or a statement from the Sultan of Oman (who has mediated past US-Iran contacts) could move odds quickly in either direction.

API access

Get prediction market intelligence as a structured API feed. Early access waitlist.