📈Finance/KALSHI/May 21, 2026
kalshi market
BLS CPI release

Will CPI rise more than 0.6% in May 2026?

PRISM
25.0%
MARKET (PUBLISH)
20.0%
MARKET (SETTLED)
0%
MOVE
-20pp

PRISM detected 5.0pp mispricing — market held

PRISM estimated 25% against the market's 20%. This time, the market was right — a calibration data point.

PRISM MISSED-100% return
ISSUED FORECASTMay 21, 2026 at 4:26 AM
MODERATE · UNDERPRICED+5.0ppPRISM 25% · Market 20%
PRISM
25.0%
VS
MARKET
20.0%
EDGE DETECTED5.0pp
WEAK
MODERATE
STRONG
EXTREME
OUTCOME
NO
FORECAST
MODERATE
DIRECTION
UNDERPRICED
CONFIDENCE
MEDIUM
ACCURACY EDGE
-23
PUBLISHED
May 21, 2026
VIEW LIVE PRISM FORECASTSEdge scoring updated every 2h
1

What happened

This market resolved NO on June 10, 2026. The market's pricing turned out to be more accurate than PRISM's assessment.

Forecast Tape

6 events
  1. May 1, 6:07 AMPUBLISHED

    Prism 17% vs market 20% — NONE FAIR

  2. May 12, 8:07 PMMARKET MOVED

    Market 20% → 34% (+14pp)

  3. May 20, 4:08 PMMARKET MOVED

    Market 34% → 28% (-6pp)

  4. May 21, 4:26 AMRE-ANALYZED

    Forecast NONE → MODERATE at Prism 25%

  5. May 21, 4:26 AMMARKET MOVED

    Market 28% → 20% (-8pp)

  6. Jun 10, 2:00 PMRESOLVED NO

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

2

What the market believed

MARKET PRICE · AT FORECAST TIME
20.0%

The market was pricing this event at 20.0% probability when PRISM generated its forecast. PRISM assessed this was too low — the market was underpricing the probability.

3

What PRISM believed

PRISM PROBABILITY
25.0%
EDGE DETECTED
5.0pp
FORECAST
MODERATE UNDERPRICED
Confidence
MEDIUM
Kelly Reference
N/A
PRISM Sizing (¼ Kelly · cap 5%)
N/A
PRISM REASONING
  • Fundamental analysis indicates a modest chance that May headline CPI exceeds 0.6% MoM despite recent strength
  • Energy-driven spikes and persistence in shelter could sustain another above‑trend print
FACTORS FOR
  • +Recent months showed elevated MoM CPI, including 0.9% and 0.6%.
  • +Energy prices and shelter have recently driven stronger inflation momentum.
FACTORS AGAINST
  • Base rate for 0.7%+ MoM CPI is historically low.
  • Policy tightening and normalization trends point to moderate, not extreme, monthly prints.
RESOLUTION PATHS MODELED
Energy and gasoline see another sharp monthly surge12%
Moderate energy plus sticky shelter push headline just above 0.6%13%
Evidence 70%Cluster: macro:cpi-print
SOURCES (7)
last week
  • Market View: Week of May 15, 2026 - Osaic Researchresearch.osaic.com

    As expected, the Consumer Price Index (CPI) came in hot again last month, rising 0.6% in April after increasing 0.9% in March. Consecutive months of sharply ...

    May 19Open →
  • Inflation Heats Up Amid Rising Energy Costs - NAMnam.org

    In April, consumer prices increased 0.6% from March and 3.8% over the year, up from the 3.3% annual rise in March and the greatest over-the-year increase ...

    May 19Open →
  • US inflation surprises but signals unclear | State Streetssga.com

    Consumer price inflation accelerated another half a percentage point to 3.8% YoY, the highest read since May 2023. Much of this reflected ongoing increases in ...

    May 18Open →
  • Inflation - April 2026 | Higher Rock Educationhigherrockeducation.org

    12-month All-Items CPI: Surged to 3.8% in April following a 3.3% increase in March. April's All-Items CPI: Rose 0.6% after increasing 0.9% in March. 12-Month ...

    May 19Open →
  • Economic Outlook: May 2026 - Pumps & Systemspumpsandsystems.com

    The index for final demand excluding food, energy and trade services increased 0.6%, the largest advance since an increase of 0.6% in October 2025. For the year ...

    May 15Open →
  • FRED verified macro/market datafred.stlouisfed.org

    ## VERIFIED ECONOMIC DATA — CPI (ALL URBAN CONSUMERS) (FRED — USE THESE NUMBERS) CRITICAL: The following data is from the Federal Reserve Economic Database (FRED) and is verified. Use ONLY these numbers. DO NOT substitute with any other data. Indicator: CPI (All Urban Consumers) Latest Value: 332.41 (as of 2026-04-01) — VERIFIED Change from previous: +2.11 (+0.64%) Trend (last 5 observations): RISING 2025-12-01: 326.03 2026-01-01: 326.59 2026-02-01: 327.46 2026-03-01: 330.29 2026-04-01: 332.41 Related indicator — Core CPI: 335.42 (as of 2026-04-01), change: +1.26 ## PRE-COMPUTED MARKET MATH (use these numbers — do NOT recalculate) Target: 0.60 index Current value: 332.41 Distance to target:

    May 21Open →
  • BLS verified labor/inflation databls.gov

    ## VERIFIED BLS DATA — CPI-U (ALL ITEMS) (USE THESE NUMBERS) CRITICAL: The following data is from the Bureau of Labor Statistics (BLS) — the OFFICIAL resolution source for Kalshi economic markets. Use ONLY these numbers. DO NOT substitute with any other data. Source: Bureau of Labor Statistics (bls.gov) — OFFICIAL U.S. GOVERNMENT DATA Series: CUSR0000SA0 Indicator: CPI-U (All Items) Reference Period: April 2026 Latest Index Value: 332.407 (as of 2026-04-01) — VERIFIED Previous Month Value: 330.293 Month-over-Month Change: +2.114 (+0.640%) Year-over-Year Change: +12.105 (+3.779%) Trend (last 5 observations): RISING 2025-12-01: 326.031 2026-01-01: 326.588 2026-02-01: 327.460 2026-03-01: 330.29

    May 21Open →

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

4

Why the gap existed

Prism's 5.0% edge call was wrong — market was right

CALIBRATION SCORECARD
PRISM ACCURACY
0.063
MARKET ACCURACY
0.040
EDGE
-22.5
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 CPI rise more than 0.6% in May 2026?, classifying it as underpriced at 20.0%.
2.Forecast classification: MODERATE UNDERPRICED — PRISM estimate 25.0% vs market 20.0%.
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: v0.9.137-stale-fair-demotion·Forecasted: May 21, 2026·Resolved: June 10, 2026·kalshi
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.