US announces blockade on Iran by 2026?

Platform comparison

Market context

The United States has already publicly announced and imposed a naval blockade on Iran, effective 10 a.m. ET on 13 April 2026, following the collapse of the Islamabad Talks and the escalation of the 2026 Iran war. This event satisfies the market’s core condition for a “Yes” resolution, as the announcement was made by President Donald Trump and enforced by CENTCOM under Admiral Brad Cooper, targeting all vessels entering or departing Iranian ports [1][3].

Historically, similar blockades against Venezuela and Cuba were declared unilaterally but faced significant evasion; Iran has already demonstrated comparable resilience, with maritime trackers confirming over 11 tankers carrying Iranian cargo successfully bypassing the blockade since its inception through spoofed location data and routes via Pakistani waters [6]. The 32% crowd-implied probability likely reflects uncertainty about whether the announcement will be deemed “official” enough under the market’s terms, despite CENTCOM’s explicit public warnings and the seizure of an Iranian-flagged cargo ship in the Gulf of Oman [1][4].

Traders should monitor the 19 June deadline for the formal signing of the peace agreement between the US and Iran, which CENTCOM has stated is required before the blockade is lifted [1][8]. Any delay in signing, or renewed Iranian closure of the Strait of Hormuz, could sustain the blockade’s operational status and solidify the “Yes” outcome. Recent reports from Reuters confirm the US has invited partner nations to join the Maritime Freedom Construct, suggesting international backing that strengthens the announcement’s legitimacy [4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Football-specific comparison page for US announces blockade on Iran by 2026?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi (US-focused) or Manifold (play-money).

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