Oil jumps on U.S.-Iran tensions as Polymarket puts Hormuz fees at 76% by Dec 31

Strait of Hormuz Tensions: Polymarket Odds Jump as Traders Price Iran Fees by December 31 After U.S. Strikes

Oil prices jumped after U.S. strikes on Iran and fresh tensions around commercial shipping in the Strait of Hormuz, sharpening focus on how Tehran could seek leverage over the waterway. On Polymarket, the ladder contract “Iran charges Hormuz fees by…?” moved higher, with traders pricing the highest likelihood on a December 31 timeline.

Key Takeaways

• Polymarket implies a 75.5% chance Iran charges Hormuz fees by December 31 (Yes 75.5% / No 24.5%).
• Traders pushed the ladder higher after renewed U.S.-Iran hostilities and warnings around transit through the Strait of Hormuz raised fears of tighter control measures.
• The market’s resolution date is 2026-08-31 23:59 UTC, and the contract is up 21.0 percentage points over the past 24 hours.

Oil prices rose after renewed fighting between the United States and Iran threatened a fragile ceasefire that had eased pressure on energy markets. Brent, the global benchmark, gained more than 3% as the move reversed a slide that had taken prices back toward pre-war levels, with September Brent futures at $76.48 a barrel at 06:30 GMT, the highest since June 23. The latest volatility followed U.S. attacks on Iran and a U.S. move to revoke a temporary waiver of sanctions on Iranian oil after attacks on three commercial vessels in the Strait of Hormuz, which U.S., Qatari and Saudi officials attributed to Iran. U.S. Central Command said it began a series of strikes intended to impose costs for targeting commercial shipping in international waters, while Tehran did not directly claim responsibility for the vessel attacks but has repeatedly warned ships against transiting routes it has not approved. Separately, the U.S. Treasury said the prior authorization to sell Iranian oil would end at 12:01 a.m. EDT on July 17, and it rescinded authorization for any new transactions, including purchases or loading, after Tuesday.

“Iran Charges Hormuz Fees” Ladder Hits $626K Volume—December 31 Leads at 75.5% (Up 21 Points in 24 Hours)

Polymarket volume in the “Iran charges Hormuz fees by…?” ladder stood at $626,375, with the leading strike “December 31” priced at Yes 75.5% versus No 24.5%. The curve shows a steep drop-off for earlier timing: “October 31” traded at Yes 68.5% / No 31.5%, while the “August 31” line was near a coin-flip at Yes 50.5% / No 49.5%. Short-dated outcomes remained discounted, with “July 31” at Yes 12.0% / No 88.0% and “July 15” at Yes 4.75% / No 95.25%, signaling traders see the base case as action later in the year rather than in the next few weeks.

Watch whether pricing continues to concentrate on late-year strikes or shifts toward the August 31 line as liquidity tests the 50/50 midpoint ahead of the 2026-08-31 23:59 UTC resolution date.

Beyond Hormuz: Other High-Volume Geopolitical and Macro Polymarket Contracts Bettors Are Watching

Elsewhere on Polymarket, traders are spreading risk across a cluster of Iran-linked geopolitical and macro contracts that track diplomacy, leadership succession and a return to baseline shipping conditions. The biggest flows are in 84.45% on “Iran leader end of 2026?” (leading outcome: Mojtaba Khamenei) with $18,596,356 in volume, alongside 40.5% on “US-Iran Final Nuclear Deal by…?” (leading outcome: December 31) with $8,228,657 traded. Short-term shipping normalization is being priced as unlikely, with 99.45% “No” on “Strait of Hormuz traffic returns to normal by July 15?” ($8,064,437) and 95.5% “No” on the July 31 version ($13,188,968), while $3,083,990 has gone through “Iran announces withdrawal from MOU negotiations by…?” with the leading “August 15” outcome at 19.5%.

Odds Trend

By the Numbers

• Platform: Polymarket
• Market: Iran charges Hormuz fees by…?
• Contract type: Price strike ladder: each rung has separate Yes/No; Yes means the spot price is above that USD strike at settlement.
• Resolution window: Aug 31, 2026 (UTC)
• Status: Active (open for trading)
• Volume: ~$626,375

Top strike rungs

+1 more strikes not shown

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