US announces blockade on Iran by 2026?

Platform comparison

Market context

The United States has already imposed a naval blockade on Iran, effective from 13 April 2026, following the collapse of the Islamabad Talks and the escalation of the 2026 Iran war. This event is not a future possibility but a realised fact, rendering the 32% crowd-implied probability for a future announcement logically inconsistent with the current timeline. The blockade, authorised by President Donald Trump and executed by CENTCOM under Admiral Brad Cooper, targets all vessels entering or departing Iranian ports, halting roughly two million barrels per day of oil exports and inflicting nearly $6bn in revenue losses on Tehran by May [1][8].

Historically, such blockades are unprecedented in recent decades, yet past Middle East operations show the US Navy routinely tracks and boards merchant vessels regardless of consent, a precedent that clarifies the current enforcement posture [5]. The market’s residual probability likely stems from confusion over the formal signing of the peace agreement, which Trump authorised for lifting the blockade on 19 June, though CENTCOM confirmed the blockade remains active until that signature is completed [1]. For a power-user evaluating this tool programmatically, the conditional order should be set to resolve “No” immediately, as the announcement event has already occurred, making any further “Yes” resolution a contradiction of the underlying real-world data.

Traders must monitor the official signing of the peace agreement on 19 June, which is the sole dependency for the blockade’s termination, rather than searching for a new announcement [1]. Recent reporting from Al Jazeera confirms the blockade has drastically reduced Iran’s crude exports to under 300,000 bpd, with 67 million barrels trapped in the Gulf of Oman unable to pass the US line [8]. The catalyst is not a future declaration but the completion of the diplomatic process; conditional orders should be structured to close positions once the agreement is signed, as the blockade’s existence is already a settled fact, not a speculative event [1][8].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Kalshi Fees, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.