What Are Prediction Markets and How Do They Work

Prediction markets let you buy and sell contracts on real-world outcomes. Here's how they work, where to trade, and why they're often more accurate than polls.

The Basic Idea

Imagine you could buy a contract that pays you $1 if a specific event happens, and $0 if it doesn't. How much would you pay for it?

If you think there's a 70% chance the event happens, you'd probably pay up to $0.70. If someone else thinks it's only a 40% chance, they'd pay $0.40. When thousands of people trade these contracts, the price settles at a number that reflects the crowd's collective judgment about how likely the event is.

That's a prediction market. The price of each contract is essentially a real-time probability estimate, powered by people putting money behind their beliefs.

How Contracts Work

Prediction market contracts are simple. Each one is tied to a yes-or-no question:

"Will the Fed cut rates in June 2026?"
"Will Finland win Eurovision 2026?"
"Will Bitcoin be above $100K on December 31?"

Contracts trade between $0.01 and $0.99. The price represents the market's implied probability. A contract trading at $0.65 means the crowd thinks there's roughly a 65% chance the event happens.

If the event occurs, the contract pays out $1.00. If it doesn't, it pays $0. Your profit (or loss) is the difference between what you paid and what the contract settles at.

Example: You buy a "Will Finland win Eurovision?" contract at $0.35. Finland wins. You get $1.00, earning $0.65 profit per contract. If Finland loses, you lose your $0.35.

Why Are Prediction Markets Accurate?

Prediction markets consistently outperform polls, pundits, and expert panels. The Iowa Electronic Markets, launched in 1988 at the University of Iowa, have predicted presidential election outcomes with greater accuracy than traditional polling for decades.

Three things drive this accuracy:

Skin in the game. When real money is on the line, people research more carefully and avoid wishful thinking. A poll asks what you hope will happen. A market asks what you'd bet on.
Wisdom of crowds. Aggregating thousands of independent judgments tends to cancel out individual errors. The collective is smarter than any single expert.
Continuous updating. Unlike polls that capture a snapshot, market prices update in real time as new information emerges. Breaking news shows up in contract prices within minutes.

Where Can You Trade?

Several platforms are available today, each with different strengths:

Platform	Type	What It Covers	Minimum to Start
Polymarket	Crypto (USDC)	Politics, sports, crypto, culture	~$1
Kalshi	Regulated (USD)	Politics, economics, weather, events	$1
PredictIt	Academic/regulated	US politics	$5
Betfair Exchange	Betting exchange	Sports, politics (UK/EU)	Varies

Polymarket is the largest by trading volume, with over $1 billion traded on some individual markets. It runs on the Polygon blockchain and uses USDC (a stablecoin pegged to the US dollar).

Kalshi is CFTC-regulated and operates with traditional USD deposits. After winning a federal lawsuit in October 2024, Kalshi became the first fully regulated prediction market for US elections.

A Quick Example: Trading Step by Step

Let's walk through a simple trade on a prediction market:

You see a market: "Will the US unemployment rate exceed 5% in Q3 2026?" The "Yes" contract is priced at $0.22.
You think unemployment will stay below 5%, so the "No" side looks attractive at $0.78 (which pays $1.00 if unemployment stays under 5%).
You buy 100 "No" contracts at $0.78 each, spending $78.
Q3 ends. Unemployment was 4.6%. Your contracts each pay $1.00.
You receive $100, earning a $22 profit (28% return).

Of course, if unemployment had exceeded 5%, you'd lose your $78. Every trade has risk.

Prediction Markets vs. Sports Betting

Prediction markets look like sports betting, but there are important differences:

Feature	Prediction Markets	Sports Betting
What you trade	Contracts on outcomes	Bets against a sportsbook
Counterparty	Other traders	The house
Pricing	Set by supply and demand	Set by the bookmaker
Can you sell early?	Yes, anytime	Usually no
Topics	Politics, economics, science, culture	Primarily sports

The biggest practical difference: you can exit a prediction market position before the event resolves. If you bought a contract at $0.30 and it rises to $0.60, you can sell for a profit without waiting for the outcome. Sports bets are typically locked in.

What Can You Predict?

Prediction markets cover a surprisingly wide range of topics:

Politics: Elections, legislation, Supreme Court decisions, international diplomacy
Economics: Fed rate decisions, inflation data, GDP growth, unemployment
Sports: Championship winners, MVP awards, draft picks
Crypto: Bitcoin price targets, ETF approvals, protocol upgrades
Culture: Award shows, box office numbers, viral moments
Science and tech: AI milestones, space launches, climate events

Getting Started

If you want to try prediction markets for the first time:

Start small. Most platforms let you trade with just a few dollars. Get a feel for how prices move before committing larger amounts.
Trade what you know. Your edge comes from having better information or analysis than the crowd. Start with topics you already follow closely.
Watch the prices first. Before trading, spend a few days watching how contract prices react to news. This builds intuition for how markets price information.
Use a tool like Beeks. Platforms like Beeks.ai aggregate data across multiple prediction markets and apply AI analysis to identify contracts where the market price may not reflect the true probability. This kind of signal can help you find an edge.