April 17, 2026

GM. This is flowframe, the only newsletter that's been watching the Strait of Hormuz since February the way you watch a package tracking number -- refreshing constantly, hoping for movement, and slowly losing faith.

Today, it moved.

Here's what we've got for you today:

• ️ Iran just declared the Strait of Hormuz "completely open" for commercial traffic. Oil prices are plunging. Polymarket's Hormuz market spiked to 80%. The biggest energy chokepoint in the world might actually be unclogging.

• Bite-sized cookies including a Lebanon ceasefire, a US Navy blockade, and oil's worst day in weeks

Prices as of 10:00 a.m. ET.

Iran's Foreign Minister Abbas Araghchi posted it on social media this morning: "The passage for all commercial vessels through Strait of Hormuz is declared completely open for the remaining period of ceasefire."

That's the sentence the global economy has been waiting to hear since February 28.

The Polymarket contract for traffic returning to normal by May 30 is at 80% YES, up 43 points. A week ago it was sitting near 37%. Oil prices plunged on the announcement. Bloomberg confirmed the reopening. The International Energy Agency said just Tuesday that "resuming flows through the Strait of Hormuz remains the single most important variable in easing the pressure on energy supplies, prices and the global economy."

Now it's happening. Or it's starting to happen, there's a big asterisk on this one.

Not exactly. Here's what's actually going on 👇

What Iran said: All commercial vessels can transit the strait for the "remaining period of ceasefire." That means this is temporary. The strait is open for the duration of the Israel-Lebanon ceasefire that took effect last night at 5 p.m. ET. If the Lebanon ceasefire collapses, so could this.

What the data says: As of Wednesday, tanker transits were still 90% below pre-war levels, according to CNBC shipping data. Only about nine oil tankers made it through this week. The strait has been effectively closed for 48 days. Mines are in the water. Insurance premiums are sky-high. Ships don't just flip a switch and resume normal routes.

What the US is doing: Trump's Navy blockade of Iranian ports is still in effect. The Pentagon confirmed Thursday that 13 ships have been turned back. Joint Chiefs Chairman Dan Caine clarified: it's a blockade of Iranian ports, not the strait itself. But those are intertwined -- Iran's exports flow through the same waterway.

What Iran wants: Tehran's 10-point ceasefire plan demands continued Iranian control over Hormuz. Araghchi's announcement specifically says the IRGC will manage passage. Iran and Oman plan to charge transit fees after the ceasefire period. Iran isn't giving up control of the strait. It's temporarily lending it.

> Here's a stat that might surprise you:

> The Strait of Hormuz carries about 20% of the world's oil supply. It's been effectively closed for 48 days. That's the longest disruption to the strait in modern history.

That's what the contract asks: does strait traffic return to normal by end of May? At 80%, the market is saying "probably." But there are layers to this.

What 80% is pricing in: Iran's announcement today. The Israel-Lebanon ceasefire holding. A second round of US-Iran talks producing some framework that keeps the strait open past the current ceasefire window. Oil coming down. Ships resuming standard routes.

What 80% is NOT pricing in: Mines. There are sea mines in the strait. The IRGC laid them during the war. Clearing those takes weeks even under ideal conditions. Insurance companies won't drop premiums until the mines are confirmed cleared. Ship operators have said they'll wait for verified safe passage before routing tankers through. "Normal traffic" means pre-war volume levels, not a trickle of nine tankers.

The 20% NO case is simple: the Lebanon ceasefire collapses, Hezbollah resumes strikes, Iran re-closes the strait, and we're back where we were last week. Or the US-Iran peace talks fail permanently, the blockade intensifies, and the strait becomes a militarized no-man's-land regardless of what Araghchi posts on social media.

Chatham House published an analysis this week that put it well: Iran's control of the strait "gives Iran an asymmetric advantage that helps shield it from what it views as an existential threat." They won't give that up easily. The reopening is real, the question is whether it lasts.

The bigger picture for your wallet:

If the strait stays open, oil drops. Gas follows. The inflation spike we've been tracking since March starts unwinding. The Fed gets room to cut. Risk assets breathe.

If it closes again, everything we just said reverses. Oil spikes. Gas spikes. CPI runs hot. The Fed stays frozen. Recession odds climb.

The strait isn't just a shipping lane. It's the variable that determines whether the second half of 2026 is a recovery or a recession.

The takeaway:

Polymarket at 80% is the most optimistic this contract has been since the war started. The announcement is real. Ships will start moving. But "completely open" is doing a lot of work when there are mines in the water, a Navy blockade on Iranian ports, and a ceasefire that could collapse if Hezbollah doesn't cooperate.

Watch three things: whether tanker transit numbers actually climb in the next 72 hours (not announcements -- actual ships), whether the Lebanon ceasefire holds past the weekend, and whether Pakistan's shuttle diplomacy produces a second round of US-Iran talks before April 21.

At 80%, the market is betting yes on all three. That leaves 20% for everything that could go wrong. In this war, 20% has been plenty.