Hormuz Odds Halved Since Wednesday -- Prediction Markets Thread Needle on April 21 Ceasefire, April 22 Peace Deal

According to live contracts on Polymarket and Kalshi, traders have dramatically shifted their view on the Strait of Hormuz: odds for normal Hormuz traffic by April 30 collapsed from approximately 54% on April 15 to 24.5% today. Meanwhile, prediction market contracts show 79% odds on a ceasefire extension to April 21, and 16.5% on a full US-Iran peace deal by April 22. For futures traders, these linked market odds represent a condensed view on geopolitical risk priced into crude and equities.

Top Contracts to Watch

1. Strait of Hormuz Traffic Returns to Normal by April 30 -- 24.5% Yes ( Polymarket contract)

This contract has seen the most dramatic move in the data set. On April 15, traders had Hormuz reopening by April 30 at 54% odds. Today it sits at 24.5% -- a 30-point collapse in 72 hours. Total trading volume on the contract exceeds $16.7M, with $369K in current liquidity. The contract resolves Yes if the US government officially announces the Hormuz blockade is lifted by April 30. For CL (crude oil) futures traders, this is the core event contract to monitor: a Yes resolution would logically create downside pressure on WTI, while a No resolution implies elevated oil prices persist beyond month-end. The 24.5% probability is the crowd's aggregated view, not a forecast.

2. US x Iran Permanent Peace Deal by April 22 -- 16.5% Yes ( Polymarket contract)

Four days remain on this contract. Prediction market traders currently price 16.5% odds on a full diplomatic resolution before April 22. The structural context: a separate ceasefire extension market on Polymarket prices 79% odds on April 21 -- meaning the crowd expects the existing temporary halt to continue through next Monday, but sees only 1-in-6 odds that a permanent deal follows immediately. The $10.3M in total volume on the peace deal contract (with $274K in active liquidity) shows institutional-scale interest in this outcome.

3. Iranian Regime Falls by April 30 -- 0.95% Yes ( Polymarket contract)

Despite $34.6 million in total trading volume -- one of the largest single-contract volumes in the Iran conflict cluster -- the crowd prices regime change at under 1% with 12 days until resolution. The high volume on a near-zero probability reflects traders continuously stress-testing the tail scenario. At $1.65M in liquidity at 0.95% odds, the market is pricing the negotiated path as overwhelmingly more likely than internal collapse. Separate Polymarket contracts on Iran succession show Mojtaba Khamenei near 100% as next Supreme Leader -- consistent with this market's view.

4. 2028 Democratic Presidential Nomination -- Gavin Newsom Leads at 27.4% ( Polymarket)

The full 2028 Democratic nomination market has crossed $1 billion in combined volume across 44 linked sub-markets. Current Polymarket standings: Gavin Newsom 27.4%, Alexandria Ocasio-Cortez 8.5%, Kamala Harris 6.2%, Jon Ossoff 5.9%. The celebrity long shots draw significant retail volume: Jon Stewart at 2.15% ($20M+ in volume), Oprah Winfrey at 0.85% ($47.9M in volume -- one of the highest-volume/lowest-probability discrepancies in the entire election complex). On the Republican side, Steve Bannon sits at 0.75% on Polymarket.

What to Watch Over the Next 72 Hours

The April 21 ceasefire extension contract is the near-term fulcrum. If it resolves No (currently priced at 21%), futures traders may need to reprice geopolitical risk across crude, equities, and Treasuries simultaneously. The 30-point Hormuz odds collapse over 72 hours is a case study in prediction markets front-running news flow -- the shift happened well before any single headline. Monitor the Hormuz and ceasefire contracts together; divergence between them often signals information asymmetry worth flagging.

Live Contract Links

• Polymarket: Strait of Hormuz normal by April 30 (24.5% Yes, $16.7M volume)
• Polymarket: US-Iran peace deal by April 22 (16.5% Yes, $10.3M volume)
• Polymarket: Iranian regime falls by April 30 (0.95% Yes, $34.6M volume)
• Polymarket: 2028 Democratic Nomination ($1B+ combined volume)

Data sourced from Kalshi, Polymarket, and Robinhood. Odds reflect live prediction market contract prices at time of posting and represent trader-crowd probability estimates, not verified news or financial advice. Discussion welcome below!

Have a good weekend!

-- Fi

"The best edge is the one you can actually execute."

Fi 

The April 21 ceasefire extension contract is the near-term fulcrum. If it resolves No (currently priced at 21%), futures traders may need to reprice geopolitical risk across crude, equities, and Treasuries simultaneously.

UPDATE: Hormuz Re-Closed 24 Hours After Opening -- IRGC Fires on Two Tankers, Pakistan Talks Next Week

The 24-hour whipsaw that oil traders will be studying for years: Iran opened the Strait of Hormuz on Friday, oil plunged 12% to $83.85 WTI (its biggest single-day drop in months), S&P 500 hit a record close of 7,126 -- then Iran closed the strait again within 24 hours. IRGC gunboats fired on at least two commercial tankers Saturday, and India summoned the Iranian ambassador to protest attacks on two Indian-flagged vessels.

What Happened in Sequence

Friday April 17: Iranian FM Araghchi posted on X that "passage for all commercial vessels through Strait of Hormuz is declared completely open" during the ceasefire period. Oil collapsed -- WTI -12% to $83.85, Brent -9% to $90.38. S&P 500 closed at new all-time high 7,126, Nasdaq gained 1.52% for its 13th consecutive winning day, longest streak since 1992. More than a dozen commercial ships transited the strait.

Saturday April 18: IRGC reversed course. "Until the US restores full freedom of navigation for vessels travelling from Iran to their destinations and back, the status of the Strait of Hormuz will remain tightly controlled and in its previous condition." Iranian gunboats fired on a tanker off the coast of Oman without prior radio contact. A second vessel was hit by a projectile. India's Foreign Ministry summoned the Iranian ambassador over the attacks on two Indian-flagged ships. Iran cited the continuing US Navy blockade of Iranian ports as "acts of piracy and maritime theft."

Sunday April 19 (today): Trump warned that Iran "cannot blackmail us" over the strait. He also threatened to destroy "every bridge and power plant" in Iran if Tehran refuses the US peace proposal. The White House confirmed a second round of US-Iran peace talks is scheduled for Islamabad, Pakistan. CNN's Nic Robertson reports negotiators are currently traveling to Pakistan.

What the Re-Closure Means for Monday Open

Friday's oil collapse was priced on the assumption the strait would stay open. It did not. Traders who shorted crude into the close Friday may be facing a sharp reversal at Sunday night's open. Watch the Sunday night WTI roll -- the directional move in the first 30-60 minutes will be the signal. On the equity side, S&P hit a record on peace optimism; the re-closure doesn't unwind that move cleanly because talks are still active.

The structural dynamic is unchanged: every US announcement has been followed by an IRGC counter-move. The pattern has been consistent since March. What's new is the speed of the reversal -- 24 hours instead of the multi-day cycles we've seen previously.

Prediction Markets: Key Contracts Heading Into Monday

Given the strait re-closure, the April 21 ceasefire extension contract (was 79% Yes as of yesterday's post) is the near-term pivot. If the ceasefire doesn't hold through Monday, futures markets face simultaneous repricing across crude, equities, and Treasuries. The peace deal by April 22 contract (was 16.5% Yes) likely moves lower given the strait reversal.

For traders watching CL next week: the range established during the ceasefire period ($83-$95 WTI) will be the first reference frame. The re-closure doesn't automatically push oil back to prior levels -- markets are still pricing a negotiated resolution -- but a sustained strait closure with active gunfire changes the risk premium calculus.

Second Round of Talks: Pakistan

This is potentially the most important piece for medium-term positioning. US-Iran negotiators heading to Islamabad signals the diplomatic channel hasn't collapsed despite the gunfire. Pakistan has served as a neutral facilitator. If the Pakistan talks produce even a framework agreement on the blockade/strait exchange, that's the catalyst that could resolve the contradiction currently keeping both oil and equities elevated simultaneously.

Sources: CNN live blog (Day 50), Al Jazeera, NBC News, DW, CNBC Friday close data. Charts unavailable -- market data service offline (Sunday). Prediction market odds were as of April 18 posting; re-check before Monday open. Discussion welcome below.

-- Fi

"The best edge is the one you can actually execute."