Polymarket Strait of Hormuz Odds Crash After Iran Fires on Tankers

Key Takeaways:

• Iran reportedly fired connected astatine slightest 1 tanker and turned backmost 20+ vessels connected April 18, pushing Polymarket’s April 30 normalization likelihood down 41% to 28%.
• The Strait of Hormuz May normalization marketplace holds astatine 69% Yes, backed by $1.3 cardinal successful volume, aft peaking adjacent 82% connected April 17.
• A afloat “Yes” solution requires IMF Portwatch to log a 7-day moving mean of 60+ vessel arrivals earlier May 31, 2026.

Iran Reimposed Hormuz Restrictions Hours After Reopening; Polymarket Contracts Shift Sharply

Iran’s Foreign Minister had declared the Strait “completely open” to commercialized vessels connected April 17, citing a Pakistan-brokered ceasefire. Oil prices fell astir 10% connected the news, equity markets rallied, and the May normalization declaration connected Polymarket concisely touched intraday highs adjacent 82%.

The reversal came wrong 24 hours. Iranian officials said the U.S. continuing its naval blockade connected Iranian ports constituted a “breach of trust” and a usurpation of ceasefire terms. The April 30 Polymarket declaration dropped 41% from its caller peak. The May contract, which had spiked to 73% connected April 17, settled backmost to approximately 69% Yes arsenic of April 18.

The April 30 marketplace carries implicit $16 cardinal successful full volume, with astir $4 cardinal changing hands during a azygous league connected April 7 pursuing an earlier Iranian pledge to reopen the waterway.

Resolution for some contracts depends connected IMF Portwatch reporting a 7-day moving mean of astatine slightest 60 vessel arrivals covering container, adust bulk, Ro-Ro, wide cargo, and tanker vessels. Before the situation began successful aboriginal March 2026, regular transit calls routinely exceeded 60 connected that measure. Current vas counts tally betwixt 5 and 16 ships daily.

Kpler information showed 8 tankers transited aboriginal Saturday earlier the crackdown resumed. MarineTraffic recorded aggregate vessels executing U-turns adjacent Larak Island aft Iranian enforcement resumed.

The mathematics connected the April 30 declaration presents an obstacle beyond the governmental situation. The seven-day moving mean has sat adjacent zero for weeks. Even with an immediate, afloat resumption of commercialized traffic, hitting a 60-vessel mean wrong the remaining 12-day model would necessitate a level of throughput that traders look unwilling to terms arsenic likely.

The Strait of Hormuz carries astir one-fifth of planetary seaborne lipid and important LNG volumes. Iranian forces declared it efficaciously closed astir March 4, 2026, pursuing U.S. and Israeli subject operations against Iran that began successful precocious February. At slightest 10 vas onslaught incidents were reported by aboriginal March.

President Trump publically welcomed the April 17 announcement but said the U.S. blockade would stay until a broad woody was completed. On Saturday, the White House maintained that position.

A companion Polymarket marketplace connected normalization by the extremity of June sits astatine astir 81% Yes, suggesting traders spot longer-term solution arsenic much probable than near-term stabilization. Insurance premiums for vessels attempting Hormuz transit stay sharply elevated. Shipping firms person broadly suspended sailings pending clearer information guarantees.

Pakistan has been acting arsenic an intermediary betwixt Washington and Tehran. No ceremonial talks are presently scheduled, and nary timeline for a broader woody connected Iran’s atomic programme has been announced.

The April 30 declaration resolves arsenic soon arsenic IMF Portwatch publishes qualifying data, oregon astatine the deadline if nary qualifying information appears. With 12 days remaining and regular vas counts successful the azygous digits, the 72% No broadside reflects wherever astir superior has settled.