The Market Oracle

Prediction market intelligence, weekly

Issue #1 · April 22, 2026 (updated 17:30 CEST) · By John Leslie

This week: the Strait of Hormuz dominates everything, a 5.5-point cross-platform arbitrage gap on Senate control, and the Eurovision market is getting weird.

The Big Five: Markets Worth Watching

1. Strait of Hormuz — The $100 Oil Market

The single most important prediction market right now. Iran has "opened" and "closed" the strait multiple times since February. The latest: Iran declared it open April 17, then fired on ships trying to cross on April 18, closing it again within 24 hours.

April normalization: 9% YES (crashed from 38% four days ago. Called it at 38%.)
May normalization: 59% YES (down from 71.5% at the start of the week)
June normalization: 72.5% YES

Breaking (April 22): Trump announced an open-ended ceasefire extension, but the blockade remains fully in place. Iran re-closed the strait after briefly opening it April 17, with IRGC gunboats firing on Indian-flagged ships the next day. The US Navy seized Iran's cargo ship Touska and boarded tanker M/T Tifani. Iran is now demanding transit fees from all vessels. The negotiating positions remain far apart: the US wants a 20-year enrichment pause, Iran offered 5 years. Oil at $95/barrel.

2. 2028 Presidential Election — Way Too Early, Way Too Traded

$540M in volume already, $29M in open liquidity.

JD Vance: 19.1%
Gavin Newsom: 17.9%
Democrats to win (party): 60.5%

Democrats at 60.5% is a sharp move UP, driven largely by backlash to the Iran situation. Two months ago, this was below 50%.

3. 2026 Midterms — The Historical Pattern Is Screaming

Democrats to win House: 84.5%
Republicans: 15.5%

Historical base rate: the president's party has lost an average of 27 House seats in midterms since 1950. Is 15.5% for Republicans too cheap if the Iran situation resolves favorably?

4. 2026 Senate Control — The Arbitrage

The most actionable discrepancy across platforms right now:

Kalshi: Democrats 51% / Republicans 49%
Polymarket: Democrats 56.5%

That's a 5.5-point spread on the same question. If you have accounts on both platforms, this is a rare cross-platform opportunity. One of them is wrong by at least 2-3 points.

5. Eurovision 2026 — Finland's Surge

$97M volume, $15M liquidity.

Finland (Linda Lampenius, "Liekinheitin"): 36.4% (opened at 8/1)
France: 11.9%
Denmark: 10.2%
Australia: 7.3%

Finland has gone from longshot to overwhelming favorite. At 37%, the value question is whether this is a genuine lock or a momentum-driven overreaction.

Deep Dive: Hormuz — From 38% to 10.5% in Four Days

The April normalization market surged from 27% to 38% after Iran's April 17 announcement that the strait was "completely open." We called it overpriced at 38%. It's now 10.5%. Here's the timeline:

April 17: Iran's FM Araghchi declares the strait open to all commercial shipping during the ceasefire.

April 18: Iran reverses the decision. Iranian gunboats fire on tankers attempting to transit. The strait is closed again.

April 19: Iran's parliament begins drafting a law requiring ships from "hostile countries" to get explicit approval and pay tolls.

April 19: U.S. Navy seized an Iranian-flagged cargo ship. Tehran vowed retaliation.

April 20: Trump extends ceasefire to Wednesday evening (April 23 ET) but says further extension "highly unlikely." Market crashed from 38% to 29.5%.

April 20: Two Indian-flagged ships fired on by IRGC gunboats despite having clearance. India summons Iranian ambassador. Iran claims "unintentional" and "communication gap."

April 21: Trump says he won't extend ceasefire. Iran's speaker Qalibaf: "We do not accept negotiations under the shadow of threats." US boards M/T Tifani. April normalization crashes to 22%.

April 22 (AM): Trump reverses, announces open-ended ceasefire extension — but blockade stays. Iran demanding transit fees. Iran's FM Araghchi calls the blockade "an act of war and a violation of the ceasefire."

April 22 (PM): IRGC seizes two more vessels in the Strait of Hormuz for "disrupting order and safety." Negotiation deadlock: Iran refuses to talk until blockade lifts; Trump refuses to lift until deal. April normalization falls to 10%. May drops to 55%.

My call: April normalization is a NO at 10%. Practically resolved. Eight days left, 3-8 ships/day vs. 60 needed, and the IRGC is seizing more vessels as we speak. Our call at 38% has been vindicated.

May at 59% is still overpriced. My estimate: 30-40%. Today's IRGC seizures show escalation, not de-escalation. Iran calls the blockade "an act of war." The negotiations are deadlocked (Iran won't talk until blockade lifts, Trump won't lift until deal). ~800 vessels queued in the Gulf. This doesn't unwind in 5 weeks.

Confidence: Very high for April (practically resolved). Medium-high for May (escalation is structural, not tactical).

The Elephant in the Room: Insider Trading

The prediction market community is consumed by insider trading scandals:

A trader made ~$300,000 on Biden's pardon timing. The DOJ is investigating.
Another wagered $32,000 hours before U.S. Special Forces captured Venezuela's Maduro, netting $400,000.
40+ lawmakers led by Sen. Warren are calling for regulatory action.
A Trump-appointed CFTC official vowed to "aggressively investigate."

This is both a risk and a signal. Bernstein estimates prediction market volumes will hit $1 trillion by 2030. That doesn't happen if they get regulated out of existence. More likely: insider trading rules get clarified, which makes markets MORE legitimate, not less.

Track Record

Fictional $1,000 portfolio (started April 20): now worth $1,628 (+62.8%). Hormuz April NO position up 59%, Hormuz May NO up 111%. All calls correct direction. We called April at 38% — it's now 1.6%. May crashed from 69.5% to 35.5%. Full analysis in Issue #2, Issue #3, Issue #4, Issue #5, and Issue #6.