Polymarket's "US naval blockade of Iran ends by March 31, 2027" contract was trading at 74.5% Yes as of mid-morning Tuesday, September 29. The event has logged $33,486,973 in cumulative volume since launch, with $519,322 of liquidity as of 09:07:57 UTC, but the March contract itself carries only $24,290 in volume — so that 74.5% print comes from a much smaller pool of capital than the headline number suggests.
Where the money actually sits
The heavy flow is in nearer-dated contracts priced for near-certain No outcomes. The September 30 deadline has drawn $5,238,179 against a 3.3% Yes price, and October 31 has seen $2,604,557 at 24.5% Yes. December 31 sits between the two extremes: $2,596,836 in volume and 57.9% Yes.
Each deadline is a separate bet. Polymarket's market structure means those contracts can't be combined into a single event probability, even though traders reading the board might try.
A phased deal is on the table
Reuters reported on September 24 that U.S. and Iranian negotiators are weighing a phased arrangement — Tehran would reopen the Strait of Hormuz in exchange for lifting the U.S. economic blockade. Neither side is rushing to give up leverage. Washington keeps the economic pressure on, while Iran holds a shipping artery that matters for global oil.
Resolution rules are strict. Polymarket specifies that only official announcements from the U.S. government count, excluding speculation or conditional statements. Partial concessions don't qualify. As things stand, current conditions don't trigger resolution, which is why expectations keep sliding later on the calendar.
Shooting in the strait
The situation on the water is not calming down. Iran says it struck 19 ships in the Strait of Hormuz over the past two nights, according to Fars News Agency on Sunday, after hitting 12 vessels Friday night and seven more before that.
Flow data tells a similar story. Kpler reported over 20 million barrels of crude and products exiting the U.S. blockade line as a seven-day average. Most oil tankers transiting the Bab el-Mandeb strait are Russian-linked, and no Israeli- or Saudi-linked tanker has passed through.
That traffic mix matters for how quickly a deal could change conditions on the ground. Past U.S.-Iran ceasefire agreements have unraveled quickly, which is one reason traders may be leaning toward narrower, nearer-term resolutions rather than the March 2027 contract.
The read-through to crypto
Observers are watching how the Iran-U.S. ceasefire proposal feeds into Bitcoin price expectations, since the blockade is a risk-sentiment story as much as an oil story. The March contract's thin book means its 74.5% print shouldn't be read as a firm market consensus — the money is elsewhere on the board.
What to watch: whether negotiators move from "considering" a phased deal to anything the U.S. government formally announces, and whether the September 30 and October 31 contracts keep pricing near-certain No as their deadlines approach. Until an official U.S. announcement lands, the March contract stays unresolved under market rules, no matter where it trades.
