15 Minute Markets

For portfolio managers and advisers

Prediction market evidence, measured, for people who run money

We do not tell you what to buy, sell or hedge. We record what Kalshi, Polymarket US and global Polymarket priced, and measure how that compared with what happened.

What we measure

Calibration

Did a 70% market win 70% of the time?

For CPI, Fed, payrolls and GDP markets, priced against the outcome, by horizon and venue.

Sample: Kalshi economics markets, 6 h before the close: Brier 0.067 over 1,597 contracts in 641 events, as of 2026-11-13.

Research plan · the count behind every figure
Event Chains

What moved after past CPI prints

Rates, Treasury, gold, crypto and index markets at one minute to four hours after each release, with which venue moved first.

Sample: CPI: 3 releases measured since 2026-09-11, across 8 linked market families, as of 2026-11-12.

Research plan
Hedge basis series

What a strike ladder would have offset

The past gap between a Kalshi BTC strike ladder and a Deribit spread over the same window, with dates and counts. A measured series, not sizing.

Sample: 3,478 readings in October 2026 · 8 trials

Research plan
Settlement audits

When the same question paid differently

Matched markets across venues, graded A to D, and every pair that settled apart, with the clause that caused it.

Sample: October 2026: 46 of 5,539 settled pairs paid differently.

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What this page does not do

No recommendations to buy, sell, size or hedge, and no mapping of your holdings to markets. Those wait on our counsel's answer on adviser rules.

Every result shows how many tests stood behind it. Past figures say what happened, not what will.

Research plan, by invite

All four measurements, the API, and citable figures for your notes.

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15 Minute Markets is independent and is not affiliated with, endorsed by, or sponsored by Kalshi or Polymarket. Research, not investment advice.