🌍Geopolitics/POLYMARKET/May 22, 2026
polymarket market
Diplomatic event

Will the Iran ceasefire continue through May 31?

PRISM
52.9%
MARKET (PUBLISH)
46.0%
MARKET (SETTLED)
0%
MOVE
-46pp

PRISM detected 6.9pp mispricing — market held

PRISM estimated 53% against the market's 46%. This time, the market was right — a calibration data point.

PRISM MISSED0% return
ISSUED FORECASTMay 20, 2026 at 2:09 PM
MODERATE · UNDERPRICED+6.9ppPRISM 53% · Market 46%
Live view diverged · PRISM reclassified to NONE with edge now +0.0pp. The issued forecast above is the historical commitment scored on the public ledger.
PRISM
52.9%
VS
MARKET
46.0%
EDGE DETECTED6.9pp
WEAK
MODERATE
STRONG
EXTREME
OUTCOME
NO
FORECAST
MODERATE
DIRECTION
UNDERPRICED
CONFIDENCE
MEDIUM
ACCURACY EDGE
-15
PUBLISHED
May 22, 2026
VIEW LIVE PRISM FORECASTSEdge scoring updated every 2h
1

What happened

This market resolved NO on May 26, 2026. The market's pricing turned out to be more accurate than PRISM's assessment.

Forecast Tape

7 events
  1. May 20, 2:09 PMPUBLISHED

    Prism 53% vs market 46% — MODERATE UNDERPRICED

  2. May 21, 4:26 AMRE-ANALYZED

    Forecast MODERATE → NONE at Prism 71%

  3. May 21, 4:26 AMMARKET MOVED

    Market 46% → 69% (+23pp)

  4. May 22, 8:07 AMRE-ANALYZED

    Forecast NONE → MODERATE at Prism 75%

  5. May 22, 2:06 PMRE-ANALYZED

    Forecast MODERATE → NONE at Prism 82%

  6. May 22, 2:06 PMMARKET MOVED

    Market 69% → 81% (+13pp)

  7. May 26, 1:30 AMRESOLVED NO

    Resolved NO. Market was closer than Prism on this call.

2

What the market believed

MARKET PRICE · AT FORECAST TIME
46.0%

The market was pricing this event at 46.0% probability when PRISM generated its forecast. PRISM assessed this was too low — the market was underpricing the probability.

3

What PRISM believed

PRISM PROBABILITY
52.9%
EDGE DETECTED
6.9pp
FORECAST
MODERATE UNDERPRICED
Confidence
MEDIUM
Kelly Reference
N/A
PRISM Sizing (¼ Kelly · cap 5%)
N/A
PRISM REASONING
  • Estimated probability: 83% that no qualifying U.S
  • strike on Iranian soil occurs by the deadline
  • Market may underweight stringent strike definition and active ceasefire diplomacy for this short horizon
FACTORS FOR
  • +Ceasefire formally still in place despite localized violations
  • +Active U.S.–Iran diplomatic channel and new proposal via mediators
FACTORS AGAINST
  • Intelligence suggests Iran rapidly rebuilding missile and drone capacity
  • Ceasefire assessed as fragile with ongoing limited regional attacks
RESOLUTION PATHS MODELED
No U.S. bombs, drones, or missiles hit Iranian soil78%
Any incident lacks confirmation as qualifying strike within one day5%
Evidence 63%Cluster: us-iran
SOURCES (5)
last day
  • Live Updates: Rubio says "slight progress" in Iran peace talks, but ...cbsnews.com

    Israel and Lebanon signed a U.S.-brokered ceasefire in mid-April, but Israel and Hezbollah have continued fighting despite the agreement, which the Iranian- ...

    May 22Open →
  • Iran Confirms Receiving New US Ceasefire Proposal ... - YouTubeyoutube.com

    1. Add a comment... 18:21. Go to channel Geo Headlines · Early Morning Headlines Shake the World | Geo News 9AM Headlines May 22, 2026. Geo Headlines. New. 14K ...

    May 21Open →
  • Iran Update Special Report, May 21, 2026 | ISWunderstandingwar.org

    Iran is continuing to use the ceasefire period to reconstitute its drone and missile program. ... Iran could prevent ships from traversing the strait anytime it ...

    May 21Open →
  • Iran-US war latest: US Secretary of State Marco Rubio hails 'good ...independent.co.uk

    Iran has been rebuilding its military capacity much faster than expected during a six-week ceasefire with the US and Israel, according to new US intelligence ...

    May 22Open →
  • May 22, 2026 - FDDfdd.org

    As Iran braced for conflict with the U.S., a key reg · Iran has discussed partnering with the Gulf stat · Senior Iranian officials maintain · The U.S. and Iran ...

    May 22Open →

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

4

Why the gap existed

Prism's 6.9% edge call was wrong — market was right

CALIBRATION SCORECARD
PRISM ACCURACY
0.672
MARKET ACCURACY
0.656
EDGE
-15.5
Brier edge
The market's probability estimate was more accurate than PRISM's on this call.
5

How this forecast played out

1.PRISM analyzed Will the Iran ceasefire continue through May 31?, classifying it as underpriced at 46.0%.
2.Forecast classification: MODERATE UNDERPRICED — PRISM estimate 52.9% vs market 46.0%.
3.Kelly reference at forecast time: —% (¼ Kelly, capped at 5%; mathematical reference only — not a position recommendation).
4.Outcome: resolved NO.

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: v0.9.148-esports-paid-off-by-default·Forecasted: May 22, 2026·Resolved: May 26, 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.