🌍Geopolitics/POLYMARKET/May 21, 2026
polymarket market
Diplomatic event

Will the Iran ceasefire continue through May 24?

PRISM
76.0%
MARKET (PUBLISH)
66.5%
MARKET (SETTLED)
100%
MOVE
+34pp

PRISM detected 9.5pp mispricing — market held

PRISM estimated 76% against the market's 67%. This time, the market was right — a calibration data point.

PRISM MISSED0% return
ISSUED FORECASTMay 20, 2026 at 10:07 AM
MODERATE · UNDERPRICED+9.5ppPRISM 76% · Market 67%
Live view diverged · PRISM reclassified to NONE with edge now +0.6pp. The issued forecast above is the historical commitment scored on the public ledger.
PRISM
76.0%
VS
MARKET
66.5%
EDGE DETECTED9.5pp
WEAK
MODERATE
STRONG
EXTREME
OUTCOME
YES
FORECAST
MODERATE
DIRECTION
UNDERPRICED
CONFIDENCE
MEDIUM
ACCURACY EDGE
+8
PUBLISHED
May 21, 2026
VIEW LIVE PRISM FORECASTSEdge scoring updated every 2h
1

What happened

This market resolved YES on June 2, 2026. The market's pricing turned out to be more accurate than PRISM's assessment.

Forecast Tape

4 events
  1. May 20, 10:07 AMPUBLISHED

    Prism 76% vs market 67% — MODERATE UNDERPRICED

  2. May 21, 12:08 AMRE-ANALYZED

    Forecast MODERATE → NONE at Prism 85%

  3. May 21, 12:08 AMMARKET MOVED

    Market 67% → 83% (+16pp)

  4. Jun 2, 1:46 AMRESOLVED YES

    Resolved YES. Market was closer than Prism on this call.

2

What the market believed

MARKET PRICE · AT FORECAST TIME
66.5%

The market was pricing this event at 66.5% probability when PRISM generated its forecast. PRISM assessed this was too low — the market was underpricing the probability.

3

What PRISM believed

PRISM PROBABILITY
76.0%
EDGE DETECTED
9.5pp
FORECAST
MODERATE UNDERPRICED
Confidence
MEDIUM
Kelly Reference
N/A
PRISM Sizing (¼ Kelly · cap 5%)
N/A
PRISM REASONING
  • Fundamental analysis indicates a high likelihood the ceasefire persists through May 24 under the contract’s narrow strike definition
  • This matters because some traders may overweight proxy violence that does not trigger NO resolution
FACTORS FOR
  • +Verified news shows no recent U.S. strikes on Iranian territory
  • +Diplomatic channels open with no clear escalation signals
  • +Ceasefire has held for weeks despite regional friction
  • +Resolution requires specifically U.S. kinetic action on Iranian soil
FACTORS AGAINST
  • Ceasefire widely characterized as fragile and imperfect
  • Regional fighting in Lebanon and elsewhere could spark rapid escalation
RESOLUTION PATHS MODELED
No direct U.S. aerial, drone, or missile strike on Iranian soil80%
Limited or proxy clashes occur but fail contract’s kinetic-action definition6%
Evidence 55%Cluster: us-iran
SOURCES (8)
last day
  • Trump: Ceasefire Shaky; Iran Issues Death Threats | CBN ...youtube.com

    President Trump says the US was just one hour away from launching another military strike against Iran before he held off at the request of America's Arab ...

    May 20Open →
  • BREAKING NEWS: Iran Demands End to All Fighting ...youtube.com

    W News host Leigh-Ann Gerrans brings you the latest breaking news as Iran demands an end to all fighting, including in Lebanon, amid rising regional ...

    May 20Open →
  • Headlines for May 20, 2026democracynow.org

    It comes as President Trump says Iran has “two or three days” to reach a deal to end the war or face renewed attacks. Meanwhile, the U.S. Senate voted Tuesday ...

    May 20Open →
  • Iran warns Trump: 'We'll take war global if you bomb us again'youtube.com

    Iran has threatened to spread the war beyond the Middle East if Donald Trump starts bombing the country again. Is it an empty threat or should we be worried ...

    May 20Open →
  • Anmol Pinky Drug Case Shocking Updates | Weather Alert ...youtube.com

    ... 21 May 2026 In meeting with Putin, Xi urges immediate Middle East ceasefire amid Gulf tensions Naqvi reaches Tehran again as Pakistan steps up US-Iran ...

    May 20Open →
  • Amnesty: Executions Spike in Iran as Gov't Intensifies ...democracynow.org

    Amnesty International's 2025 report on the global use of the death penalty finds that executions have surged to their highest recorded number in over 40 ...

    May 20Open →
  • Expert urges US to ‘flip the script’ and 'empower' Iranian ...foxnews.com

    FDD senior director of the Iran Program Behnam Ben Taleblu discusses potential U.S. strikes on Iran, the fragile ceasefire between the two countries, ...

    May 20Open →
  • What's the significance of the Russian president's visit to ...youtube.com

    Trump hopeful of peace deal with Iran; Iranian president rejects US conditions | Janta Ka Reporter · Has an invitation to Beijing become the hottest ticket in ...

    May 20Open →

PRISM RETRIEVES EVIDENCE FROM A CURATED LIST OF PRIMARY WIRES + OFFICIAL SOURCES

4

Why the gap existed

Prism correctly identified 9.5% mispricing

CALIBRATION SCORECARD
PRISM ACCURACY
0.022
MARKET ACCURACY
0.031
EDGE
+8.3
Brier edge
PRISM's probability estimate was more accurate than the market price.
5

How this forecast played out

1.PRISM analyzed Will the Iran ceasefire continue through May 24?, classifying it as underpriced at 66.5%.
2.Forecast classification: MODERATE UNDERPRICED — PRISM estimate 76.0% vs market 66.5%.
3.Kelly reference at forecast time: —% (¼ Kelly, capped at 5%; mathematical reference only — not a position recommendation).
4.Outcome: resolved YES.

Get live PRISM forecasts for Kalshi + Polymarket.

Edge scores, Kelly references, confidence levels, and resolution paths — updated every 2 hours, before the market corrects.

VIEW LIVE FORECASTS
PRISM: v0.9.135-strategic-intake-portfolio·Forecasted: May 21, 2026·Resolved: June 2, 2026·polymarket
For informational purposes only. Not financial advice. EdgeCal provides PRISM-generated market analysis and does not execute trades, manage funds, or guarantee returns. Past performance does not indicate future results.