Prediction Markets Guide: How They Work

Q: How do prediction markets work?

Prediction markets work like a stock exchange for events. Traders buy Yes or No contracts at prices reflecting the crowd's probability estimate. A contract priced at 65 cents means the crowd believes there's a 65% chance the event will happen. If you buy Yes at 65c and the event happens, you receive $1.00 (profit: 35 cents). If it doesn't happen, you lose your 65 cents. Prices update continuously as new information arrives and traders adjust their positions.

Q: Are prediction markets legal?

Yes, in most jurisdictions. In the US, Kalshi operates as a CFTC-designated contract market (legal in all 50 states). Polymarket re-entered the US market in 2025 through a CFTC-compliant partnership. Internationally, Polymarket is available in 100+ countries via crypto wallets. Legality depends on your location and local gambling/financial regulations. See OddsShift's legal guide for country-by-country details.

Q: Are prediction markets gambling?

The CFTC classifies prediction markets as 'event contracts' — a form of derivatives, not gambling. Prediction markets operate on an exchange model (buyer vs seller), not a house model (bettor vs casino). Academic research shows their prices are well-calibrated probability estimates. However, critics argue the distinction is semantic since users risk money on uncertain outcomes. The legal and philosophical debate is ongoing, especially for sports-related contracts.

Q: Can you make money on prediction markets?

Yes, but most casual traders lose money — roughly 70% according to Yahoo Finance analysis. Consistent profitability requires an information edge: knowing something the crowd doesn't, or using tools to find mispriced markets. OddsShift's AI Observer demonstrates this with a 67% win rate using cross-platform price comparison. Beginners should start small, focus on categories they know well, and use comparison tools to find where platforms disagree.

Q: What is the difference between Polymarket and Kalshi?

Kalshi is CFTC-regulated, accepts USD deposits (bank/card), is available in all 50 US states, and issues 1099 tax forms. Polymarket is crypto-based (USDC on Polygon), available in 100+ countries, has lower fees and more markets, but requires a crypto wallet. Kalshi is better for US beginners who want simple bank deposits. Polymarket is better for crypto users and international traders. OddsShift tracks both platforms so you can compare odds side by side.

Everything you need to know about Polymarket, Kalshi, and prediction market trading in 2026.

$44B+

PM Volume (2025)

7,900+

Markets Tracked

90-97%

Accuracy (final hours)

Prediction markets are platforms where you bet on real-world outcomes — elections, crypto prices, sports, weather. You buy contracts priced $0.01-$0.99 reflecting the crowd's estimated probability. If you're right, you get $1.00. The two biggest platforms: Polymarket (crypto, global, zero fees) and Kalshi (CFTC-regulated, US, bank deposits). Markets are 85-97% accurate in final hours.

How Do Prediction Markets Work? in 60 seconds

An event is listed

"Will the Fed cut rates before July 2026?"

Traders set the price

Buyers and sellers trade Yes/No contracts. The price settles at 41c — meaning the crowd estimates a 41% chance.

You take a position

Think it's more likely than 41%? Buy Yes at 41c. Think it won't happen? Buy No at 59c. Your maximum risk = what you pay.

The event resolves

If the Fed cuts rates, Yes pays $1.00. You profit 59c per contract (+144%). If not, you lose your 41c.

Key insight: Unlike sports betting, prediction markets have NO house edge. Prices are set by other traders, not by a bookmaker. Research shows these prices are 90-97% accurate in the final hours before resolution.

Polymarket vs Kalshi the two biggest platforms

Polymarket

$44B+ volume in 2025

Crypto-based (USDC on Polygon)
Available in 100+ countries
More markets, higher liquidity
Near-zero trading fees

How to start on Polymarket →

Kalshi

$20B+ valuation, CFTC-regulated

US dollars — bank or debit card
Legal in all 50 US states
1099 tax forms issued
Sports, economics, politics

How to start on Kalshi →

These platforms often list the same events at different prices. When they disagree, one of them is wrong — and that's where opportunities exist. Compare live odds across both platforms →

Explore Prediction Markets deep-dive guides & tools

Getting Started Guide

Step-by-step tutorials for Polymarket and Kalshi. Account setup, first trade, payout calculator.

Legal & Regulation

Where are prediction markets legal? US state-by-state, international availability, CFTC regulation.

Platform Comparison

Polymarket vs Kalshi — live odds, fees, volume, accuracy. See where they disagree on 7,900+ markets.

Accuracy Tracker

Which platform predicts better? Independent cross-platform accuracy data by category and timeframe.

Arbitrage Scanner

Find cross-platform price gaps. When Polymarket and Kalshi disagree, you can profit regardless of outcome.

Live Dashboard

Real-time AI analysis, market signals, our trading portfolio, and verified P&L.

Frequently Asked Questions prediction markets basics

What are prediction markets?

Prediction markets are platforms where you buy and sell contracts on real-world event outcomes. Contract prices range from $0.01 to $0.99 and represent the crowd's estimated probability. If your prediction is correct, each contract pays $1.00. The two largest are Polymarket and Kalshi. OddsShift compares odds across both platforms in real time.

How do prediction markets work?

Traders buy Yes or No contracts at prices reflecting the crowd's probability estimate. A 65-cent contract means 65% estimated chance. If you buy Yes at 65c and the event happens, you receive $1.00 (profit: 35c). If not, you lose 65c. Prices update continuously as new information arrives. Try our payout calculator to see how the math works.

Are prediction markets legal?

Yes, in most places. Kalshi is CFTC-regulated and legal in all 50 US states. Polymarket is available in most US states (via QCEX partnership) and 100+ countries internationally. Legality depends on your location. See our full legal guide for country-by-country details.

Are prediction markets gambling?

The CFTC classifies them as "event contracts" — derivatives, not gambling. They operate on an exchange model (buyer vs seller), not a house model. Academic research confirms their prices are well-calibrated. Critics argue the distinction is semantic. See the full debate with data.

Can you make money on prediction markets?

Yes, but ~70% of casual traders lose money. Consistent profit requires an information edge. OddsShift's AI Observer has a 67% win rate using cross-platform analysis. Start with our beginner's guide and use the payout calculator to understand the math first.

What is the difference between Polymarket and Kalshi?

Kalshi: CFTC-regulated, USD deposits (bank/card), all 50 US states, 1099 tax forms, higher fees (1-7%). Polymarket: crypto-based (USDC), 100+ countries, more markets, near-zero fees, requires crypto wallet. Compare them side by side with live odds.

Ready to start? See our tools: Compare · Arbitrage · Accuracy

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