TOTAL VOLUME:
$126.8b
24H VOL:
$122,314,324
24H TRANSACTIONS:
2,159,476,470
OPEN INTEREST:
$1,331,186,481
338,503
Markets across
31,526
events
MATCHED EVENTS:
2,864
PLATFORM COVERAGE:
5
Polymarket:
40%
VS.
Kalshi:
60%
Education
Foundational explainers on how prediction markets work and the concepts behind them.
Using Prediction Markets for Journalism: A Reporting Workflow
A field guide for reporters: how to monitor prediction markets as a beat, judge a real move from noise, and vet a number before it goes in a story.
Jared Polites · Sep 14
US Regulated Prediction Markets: Who's In, Who's Not, and Where the Lines Are Blurring
IBKR, Robinhood, Gemini, DraftKings, and FanDuel all built or bought regulated exchanges of their own this year, while federal courts split on whether any of it preempts state law.
Jared Polites · Sep 13
How to Read Prediction Market Rules Before You Trust the Price
Two platforms can price the same event five points apart, not because traders disagree, but because the contracts ask slightly different questions. Read the wording before you read the price.
Jared Polites · Sep 10
CPI Prediction Market Contracts: How They're Structured and Priced
CPI, jobs report, and GDP contracts don't price a single outcome. They price a ladder of ranges, and the five platforms differ on how those ranges get built and settled.
Jared Polites · Sep 9
Are Prediction Market Winnings Taxable? Yes, Even Without a 1099
Kalshi, Polymarket, Limitless, Predict.Fun, and Opinion all create the same tax obligation on trading gains, and none of them, Kalshi included, sends you a form that covers it.
Jared Polites · Sep 7
Prediction Market Overround: Why the Odds Don't Add Up to 100%
A three-candidate market pricing at 105 cents isn't broken. Here's what that extra 5 cents actually means and why sportsbook vig is a different animal.
Jared Polites · Sep 6
Why an Election Prediction Market Can Stay Open After the News Calls the Race
A contract doesn't pay out when CNN calls it. It pays out when the specific event named in its resolution criteria actually happens, and that gap can run days or weeks past election night.
Jared Polites · Aug 29
Prediction Markets vs Sportsbooks: What Actually Changes When You Trade an Event Contract
Here's exactly what changes when you trade a Kalshi or Polymarket event contract instead of betting a sportsbook line.
Jared Polites · Aug 28
Weather Prediction Markets: How Temperature, Snowfall, and Hurricane Contracts Get Priced
Temperature, snowfall, and hurricane contracts resolve against NOAA and National Weather Service data, not a forecaster's opinion. Here's how the brackets, splits, and pricing actually work.
Jared Polites · Aug 27
Prediction Markets Regulation Outside the US: A Global Map
The CFTC model is the exception, not the template. More than 30 jurisdictions now restrict access to at least one major platform, and the UK, EU, and Asia each classify event contracts differently.
Jared Polites · Aug 25
Recurring Prediction Market Contracts: How to Read a Chain, Not a Single Bet
A recurring contract is not one market. It's a series that resets every cycle, and reading only the latest instance means missing the trend entirely.
Jared Polites · Aug 24
Why Prediction Market Odds Disagree Across Platforms (And How to Read the Gap)
A price gap between Polymarket and Kalshi isn't a pricing error. Find out what it really represents.
Jared Polites · Aug 19
How to Use Polymarket in the US (Legal Status, Setup, and a Safer Path)
Polymarket now runs a CFTC-regulated US product through its QCX exchange. Here's how it actually works, who's eligible, and when Kalshi is the better fit instead.
Jared Polites · Aug 14
Are Prediction Markets Legal? The CFTC vs. States (2026)
Prediction markets are legal for contracts structured as CFTC-regulated event contracts but the question is open for sports-outcome contracts according to state gambling law.
Jared Polites · Aug 10
What Does Prediction Market Volume Actually Mean?
Volume is the total traded over time. Open interest is what's still at stake right now. Liquidity is what you can trade this instant, and most headlines quietly blur all three into one number.
Jared Polites · Aug 5
How Accurate Are Prediction Markets? What the Resolved-Market Data Shows
Calibration, not who-won, is the real test of prediction market accuracy. Here's what large samples of resolved contracts actually show, and where the record breaks down.
Jared Polites · Jul 26
How Long Does It Take for Prediction Markets to Resolve?
Resolution speed depends on governance, not software. Kalshi confirmed a real Fed decision in eight minutes; Polymarket's identical contract took two hours because its dispute window ran uncontested.
Jared Polites · Aug 5