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Foundation

What is a prediction market?

A prediction market is a place where people trade contracts on whether something will happen. The current price acts as a probability. Here is how they work, why they often beat polls, and where you can use one.

6 min read··OddsPulse Editorial

A prediction market is a marketplace where people buy and sell contracts tied to real-world outcomes. Each contract pays $1 if the outcome happens and $0 if it does not. Because the price is bounded between 0 and 1, it can be read directly as a probability. If the contract for "Will the Fed cut rates in March?" trades at 32 cents, the market is collectively saying there is a 32% chance.

That sounds simple. The reason it matters is that these prices have a track record of being more accurate than polls, pundits, and forecasting models, especially as resolution approaches. Money on the line forces participants to be honest in a way that surveys do not.

How a prediction market actually works

Imagine a binary question with two outcomes: Yes and No. A prediction market lets you buy shares of either side. The two prices always sum to $1. If "Yes" is trading at 0.65, "No" is trading at 0.35.

  • If you think Yes is too cheap, you buy Yes. If the outcome happens, each share pays $1, giving you a $0.35 profit per share at that entry price. If it does not, you lose your $0.65.
  • If you think No is too cheap, you buy No. The math is symmetric.
  • If new information arrives, prices move as traders update. You can sell before resolution to lock in gains or limit losses.

Multi-outcome events (an election with five candidates, an Oscars Best Picture race) work the same way: each candidate is a separate contract, all priced between 0 and 1, with the sum of all probabilities adding up to roughly 1.

Why are they often more accurate than polls?

Polls measure stated preference. A prediction market measures revealed belief — what people are willing to put money behind. The two often diverge, and when they do, the money is usually right.

Three mechanisms drive the accuracy:

  1. Profit incentive. A trader who is wrong loses money. A pollster predicting badly just gets quoted again next week.
  2. Information aggregation. Every participant brings their own private information into the price. If five traders each know one piece of the puzzle, the market sees the whole picture.
  3. Real-time updating. Polls are snapshots taken weeks apart. Prediction markets refresh second-by-second as news breaks.

Where can you trade?

Three platforms dominate today, each with a distinct profile.

  • Polymarket — the largest by volume and breadth. Covers politics, sports, crypto, AI, geopolitics, and culture. Crypto-native: deposits and payouts in USDC on the Polygon blockchain. Read our beginner guide here.
  • Kalshi — US-regulated by the CFTC. Fiat deposits via ACH, no crypto required. Strong in sports and US-centric political and economic markets.
  • Limitless — newer, built on Base L2. Specializes in short-horizon markets (hourly and daily) on crypto and stock prices.

The right choice depends on what you want to trade and where you live. Our side-by-side comparison walks through fees, regulation, and trading experience.

Browse Polymarket markets

What prediction markets get wrong

They are not oracles. Three failure modes recur:

  • Thin markets are noisy. A market with $500 of volume can be moved by one trader. Look at volume before treating a price as wisdom of crowds.
  • Resolution criteria matter. "Will Trump win the 2028 election" sounds unambiguous until you read the fine print about what counts as winning, when, and per which source. Different platforms can resolve the same question differently.
  • Tail events stay mispriced longer. Markets are good at the middle 80%. Extreme outcomes ("Will an asteroid hit Earth this year?") often stay mispriced because there is no clear arbitrage that closes the gap.

Is it legal?

Depends entirely on where you live. Kalshi is fully regulated in the United States. Polymarket is restricted in several jurisdictions including the US for now (though a regulated US re-entry is in progress). Always check your local law before opening an account. This article is informational, not legal advice.

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