Prediction markets let you trade on the outcome of real-world events the same way you'd trade stocks — except instead of buying shares in companies, you're buying shares in outcomes. Will the Fed cut rates in April? Will the Lakers win tonight? Will Bitcoin close above $100K this week? Every question becomes a tradeable contract with a price that reflects the crowd's best estimate of what's going to happen.
The industry processed over $44 billion in trading volume in 2025. Kalshi reported more than $1 billion in Super Bowl trading alone. Polymarket hit $7 billion in monthly volume in February 2026. Prediction markets are now cited by CNN, CNBC, and Google as real-time probability data alongside polls and expert forecasts. Whether you want to trade for profit, hedge a real-world risk, or just follow the odds on events you care about — this guide explains how it all works from the ground up.
The Core Concept: Trading Probabilities
A prediction market turns every question into a financial contract with two sides: YES and NO. Each contract trades between $0.01 and $0.99. The price represents the market's implied probability that the event will happen.
If a contract asking "Will the Fed cut rates in April?" trades at $0.35, the market is saying there's roughly a 35% chance of a rate cut. If you think the real probability is higher — maybe you've read the latest economic data and believe it's closer to 60% — you buy YES at $0.35. If you're right, the contract settles at $1.00 and you pocket $0.65 per contract (minus fees). If you're wrong, the contract settles at $0.00 and you lose your $0.35.
This is the same logic as a stock market. Buyers think the price is too low (the event is more likely than the market thinks). Sellers think the price is too high (the event is less likely than the market thinks). The price moves as new information comes in — an economic report, an injury update, a breaking news event — and the market continuously reprices the probability in real time.
The key insight, rooted in what economists call the "wisdom of the crowd," is that when thousands of people put real money behind their beliefs, the collective estimate tends to be surprisingly accurate. Research has consistently shown that prediction markets outperform polls, expert panels, and statistical models for forecasting elections, economic events, and sports outcomes. When you have skin in the game, you think more carefully than when you're just giving an opinion.
How a Trade Works: Step by Step
Let's walk through a concrete example.
The market: "Will the Warriors win tonight?" — currently trading at YES $0.60 / NO $0.40.
You buy 100 YES contracts at $0.60 each. Your total cost is $60.00 (plus roughly $2.00 in fees, depending on the platform). The price of $0.60 means the market thinks there's a 60% chance the Warriors win.
Scenario 1: The Warriors win. Each of your 100 contracts settles at $1.00. You receive $100.00. Your profit is $100 minus your $60 cost minus fees — roughly $38.
Scenario 2: The Warriors lose. Each contract settles at $0.00. You lose your entire $60.00 investment plus fees.
Scenario 3: You sell before the game ends. During the third quarter, the Warriors take a 15-point lead. The YES price jumps to $0.85. You sell your 100 contracts at $0.85 each, collecting $85.00. Your profit is $85 minus your $60 cost minus fees — roughly $23. You don't have to wait for the final whistle.
This third scenario is what makes prediction markets fundamentally different from traditional betting. You can exit your position at any time. If the market moves in your favor, you take profit. If it moves against you, you cut your losses. You're not locked in until the event resolves.
The Exchange Model: You're Not Playing Against the House
This is the single most important thing to understand. On a traditional sportsbook — DraftKings, FanDuel, BetMGM — you're betting against the house. The operator sets the odds, builds in a margin (the "vig"), and profits when you lose. The house always has an edge.
On a prediction market exchange, you're trading against other users. The platform doesn't set the prices — traders do, through supply and demand on an order book. The platform makes money by charging a small fee on each trade, not by taking the opposite side of your bet.
This is the same model as the New York Stock Exchange or NASDAQ. Buyers and sellers post orders, the exchange matches them, and prices move based on collective trading activity. The platform is neutral — it doesn't care which side wins.
For traders, this has two practical implications. First, there's no house edge baked into the price. If the true probability of an event is 60%, the market price should trade near $0.60 (minus a small spread), whereas a sportsbook would price it at the equivalent of $0.63-$0.65 to build in their margin. Second, the order book is transparent — you can see exactly how many contracts are available at each price level, which helps you gauge liquidity and plan your entries.
What Can You Trade On?
Prediction markets cover virtually any event with a clear, verifiable outcome. In 2026, the most active categories are:
Sports — game winners, spreads, totals, player props, futures, and parlays across NFL, NBA, NCAAB, NHL, MLB, soccer, tennis, golf, UFC, F1, and esports. Sports is the highest-volume category, accounting for roughly 90% of Kalshi's revenue. For a deep dive, see our guide to the best prediction markets for sports betting.
Politics and elections — presidential, congressional, gubernatorial, and mayoral races, plus policy outcomes, approval ratings, and geopolitical events. Polymarket became the global standard for election data during the 2024 presidential cycle and continues to lead this category.
Economics and finance — Fed rate decisions, CPI prints, GDP releases, unemployment data, S&P 500 targets, commodity prices, and currency movements. These markets reprice within seconds of major economic announcements. Platforms like Opinion focus exclusively on macro markets.
Crypto — price prediction contracts on Bitcoin, Ethereum, and other major assets, including high-frequency 15-minute and 5-minute markets.
Climate and weather — temperature ranges, hurricane landfalls, snowfall totals. Kalshi owns this niche.
Culture and entertainment — Oscar winners, Grammy results, box office milestones, streaming records, and viral moments.
Technology and science — AI benchmarks, product launch dates, scientific milestones.
The range keeps expanding. At the start of 2024, prediction markets were primarily about elections and economics. By 2026, you can trade on nearly anything — from whether it will rain in Los Angeles tomorrow to whether GTA VI will be released before June.
Order Types: Market Orders vs. Limit Orders
Most prediction market platforms support two basic order types.
Market orders execute immediately at the best available price. You click buy, and your order fills instantly against whoever is selling at the lowest price. This is the simplest way to trade, but you accept whatever price the market gives you. If liquidity is thin, you might pay more than you expected.
Limit orders let you set a specific price and wait for a match. You say "I want to buy at $0.35" and your order sits on the book until someone is willing to sell at that price. This gives you precise control over your entry, and most platforms charge lower fees for limit orders because you're adding liquidity to the market.
Not all platforms support both order types. Kalshi, Polymarket, and Robinhood offer limit orders. OG currently supports only market orders, which is a notable gap for active traders. For a comparison of order types and execution across platforms, see our Polymarket vs Kalshi analysis.
Parlays (Combos): Combining Multiple Outcomes
Some platforms let you combine multiple contract outcomes into a single position — essentially a parlay. All outcomes must resolve correctly for the combo to pay out.
For example, you might combine "Warriors win tonight" + "Over 220 total points" + "Stephen Curry scores 30+" into a single combo contract on Robinhood (which allows up to 10 legs). The payout is higher because you're predicting multiple outcomes correctly, but the risk is that one wrong leg kills the entire position.
Kalshi offers "Build Your Combo." Robinhood offers preset and custom combos. OG supports parlays. Polymarket does not currently offer a combo feature.
How Markets Settle
Every prediction market contract has clearly defined resolution criteria set at the time of listing. The criteria specify exactly what outcome triggers a YES or NO settlement and which data source will be used to determine the result.
For a sports game, the resolution source is usually the official league result. For a Fed rate decision, it's the FOMC statement. For a weather contract, it's data from a specific weather service. For an election, it's the certified result from the relevant authority.
Once the event occurs, the platform (or on Polymarket's blockchain-based system, an oracle) checks the trusted data source, verifies the outcome, and settles all contracts. Correct predictions pay $1.00 per contract. Incorrect predictions pay $0.00. Proceeds are typically available in your account within one business day of settlement.
If a result is ambiguous or disputed, platforms have resolution policies. Kalshi has declined to pay out on certain controversial contracts — most notably a $54 million market on the ouster of Iran's supreme leader, where the company argued the settlement criteria were not met. This is a reminder to always read the resolution rules before trading.
Fees: What You'll Pay
Fee structures vary significantly across platforms. Understanding them matters because fees directly eat into your returns — especially if you trade actively.
Flat per-contract fees — Robinhood charges $0.02 per contract. OG charges $0.02 to open and $0.02 to close early. Simple, predictable, but adds up at volume.
Variable (formula-based) fees — Kalshi uses a probability-weighted formula where fees peak near 50/50 contracts and approach zero at extreme probabilities. Maximum is roughly $0.02 per contract. Makers pay less than takers.
Percentage-based fees — Polymarket US charges 0.10% taker fees with 0.10% maker rebates. This is dramatically cheaper at scale — a $1,000 position costs roughly $1 on Polymarket versus $35 on Kalshi at even odds.
Beyond trading fees, consider deposit and withdrawal costs. Most platforms offer free ACH deposits. Debit card deposits often carry a 1.75-2% fee. Withdrawals are generally free via ACH but may take 1-3 business days.
One often-overlooked feature: Kalshi pays approximately 4% APY on idle cash balances. For traders who keep capital on the platform between trades, this partially offsets trading fees and is something no other major platform offers.
Where to Trade: The Major Platforms
The prediction market landscape in 2026 has consolidated around a few dominant platforms, each with distinct strengths.
Kalshi — the first CFTC-designated contract market for prediction markets. Widest sports catalog, deepest liquidity, free demo account, interest on idle cash. The incumbent leader, valued at $11 billion with $1.5 billion annualized revenue.
Polymarket — the world's largest prediction market by total volume. Deepest political markets, lowest fees, most comprehensive API. Originally crypto-native, now re-entering the US via CFTC-regulated QCEX. Backed by a $2 billion investment from ICE (NYSE parent).
Robinhood — the easiest on-ramp for new users. 27 million existing accounts, zero-friction setup, all-in-one platform with stocks and crypto. Currently brokers Kalshi's contracts; acquiring its own exchange (MIAXdx) in 2026.
OG — Crypto.com's standalone prediction market. Best social features (real-time chat, leaderboards), strong sports props, announced margin trading. Launched February 2026.
Opinion — focused exclusively on macroeconomic markets. A niche play for traders who care about Fed decisions and economic data more than sports.
For detailed comparisons, see our Polymarket vs Kalshi analysis and best prediction markets for sports betting guide.
How Prediction Markets Differ from Sports Betting
If you're coming from a sportsbook background, here's what changes:
Pricing. On a sportsbook, odds are set by oddsmakers with a built-in margin. On a prediction market, prices are set by traders on an exchange. The result is generally tighter pricing — closer to the true probability — because there's no house edge.
Position flexibility. On a sportsbook, you're locked in once you bet (limited cash-out options exist but are controlled by the operator). On a prediction market, you can sell your position at any time at the current market price.
Availability. Sportsbooks require state-level gaming licenses and are legal in approximately 38 states. Prediction markets operate under federal CFTC regulation and are available in all 50 states for most contract types, with sports contracts restricted in some states.
Age. Sportsbooks require users to be 21+. Prediction markets are available at 18+.
Tax treatment. Sportsbook winnings are gambling income. Prediction market winnings are currently reported as ordinary income via 1099-MISC. The IRS has not issued specific guidance, and this may change. See our legal guide for more detail.
Market breadth. Sportsbooks focus on sports (with occasional novelty bets). Prediction markets cover sports, politics, economics, weather, crypto, culture, technology, and virtually any event with a verifiable outcome.
Who Uses Prediction Markets?
The user base has expanded dramatically in 2025-2026, from a niche of economics nerds and political junkies to a broad mainstream audience.
Sports fans — the largest group by volume. Many are coming from traditional sportsbooks and are attracted by the exchange model (no user limits, no house edge), availability in states without legal sports betting, and the ability to trade live during games.
Political and election followers — traders who follow campaigns, policy, and geopolitics. Prediction market odds are now routinely cited in media coverage alongside polling data.
Macro and finance traders — people who trade Fed decisions, CPI prints, and economic data releases. For these users, prediction markets offer a direct way to express a view on a binary outcome without the complexity of options or futures.
Algorithmic and bot traders — automated strategies account for a significant and growing share of prediction market volume, particularly on Polymarket where the API infrastructure supports sophisticated programmatic trading.
Arbitrage traders — traders who exploit price differences between platforms on the same event. When Kalshi prices a contract at $0.37 and Polymarket prices it at $0.43, buying the cheap side and selling the expensive side locks in a near-risk-free profit.
Casual followers — people who never trade but use prediction market prices as a reference. Google now displays Kalshi and Polymarket odds in search results. CNN and CNBC broadcast live prediction market data. The markets have become an information source as much as a trading venue.
The Risks: What Can Go Wrong
Prediction markets are not risk-free. Before trading, understand what you're exposing yourself to.
You can lose your entire position. If you buy YES at $0.60 and the event doesn't happen, you lose $0.60 per contract. Positions are fully collateralized — you can't lose more than you put in (unless margin trading becomes available). But losing 100% of your investment on a single trade is absolutely possible.
Liquidity risk. Not all markets are equally liquid. In a thin market, you may not be able to sell your position at a fair price when you want to exit. Always check the order book depth before entering a large position.
Resolution disputes. The Kalshi/Iran contract controversy showed that settlement isn't always straightforward. Ambiguously worded contracts or unexpected edge cases can lead to outcomes that feel unfair. Always read the resolution criteria before trading.
Insider information risk. Unlike the stock market, there are currently no insider trading laws specific to prediction markets. In February 2026, Israeli authorities accused individuals of using classified information to profit on Polymarket contracts related to U.S.-Israeli military strikes. Proposed legislation (the Blumenthal-Kim bill) would ban insider trading on prediction markets, but it hasn't passed yet.
Market manipulation. In low-liquidity markets, a single large trader can move prices significantly. Transparent order books help, but manipulation risk is real — especially on niche contracts with few participants.
Regulatory risk. The ongoing state-versus-federal legal battle could restrict access to certain markets, particularly sports contracts. The regulatory landscape is evolving rapidly.
Platform risk. Prediction market accounts are not FDIC or SIPC insured. If a platform experienced a catastrophic failure, your funds could be at risk. Choose CFTC-regulated platforms with strong institutional backing.
How to Get Started
If you've never traded a prediction market before, here's the simplest path.
Step 1: Choose a platform. If you already have a Robinhood account, start there — it's the fastest setup. If you want the widest market selection and a free demo account, start with Kalshi. If you want the lowest fees and are comfortable with a more trading-focused interface, try Polymarket.
Step 2: Complete verification. All US platforms require KYC (Know Your Customer) — typically a government-issued ID, address verification, and Social Security Number. Approval usually takes minutes.
Step 3: Deposit funds. ACH bank transfer is free on every platform. Start small — $50-$100 is enough to get meaningful exposure across several markets while learning.
Step 4: Start with what you know. If you follow the NBA, trade NBA games. If you follow the Fed, trade rate decision contracts. If you follow politics, trade election markets. Your edge comes from knowledge you already have.
Step 5: Use the demo (if available). Kalshi offers a free demo account with mock funds. If you've never traded before, this is the best way to learn the mechanics without risking real money.
Step 6: Read the resolution criteria. Before every trade, read exactly how the market will be settled. Know which data source determines the outcome, what happens in edge cases, and when settlement occurs.
Frequently Asked Questions (FAQ)
What is a prediction market?
A prediction market is an exchange where you trade contracts tied to the outcome of real-world events. Each contract has a YES/NO outcome and trades between $0.01 and $0.99, with the price reflecting the market's collective probability estimate. Correct predictions pay $1.00; incorrect ones pay $0.00.
How accurate are prediction markets?
Research consistently shows prediction markets outperform polls, expert panels, and statistical models for forecasting elections and other events. Polymarket claims accuracy above 94% a month before outcomes are definitively known. The accuracy comes from aggregating thousands of informed opinions backed by real financial stakes.
Are prediction markets legal in the US?
Yes. Prediction markets are legal at the federal level under CFTC regulation. Platforms like Kalshi, Polymarket, and Robinhood are registered with or operate through CFTC-licensed exchanges. Some states have challenged sports-specific contracts. For a comprehensive breakdown, see our guide to prediction market legality.
How much money do I need to start?
Most platforms have no formal minimum deposit. You can buy a single contract for as little as $0.01 (though a $0.02 fee would apply). Practically, $50-$100 is a reasonable starting amount that lets you diversify across several markets while learning.
Can I lose more than I invest?
No, under current rules. Prediction market positions are fully collateralized — you can only risk what you put in. If margin trading launches (OG has announced plans), losses could theoretically exceed your initial investment. But as of March 2026, no US platform offers leveraged prediction trading.
How are prediction market winnings taxed?
Most platforms report winnings as ordinary income via 1099-MISC forms. The IRS has not issued specific guidance for prediction markets. Tax treatment may evolve. Consult a tax advisor and maintain detailed trade records.
What's the difference between a prediction market and sports betting?
On a sportsbook, you bet against the house at odds the operator sets. On a prediction market, you trade against other users at prices the market sets. You can sell your position at any time, and there's no house edge. Prediction markets also cover far more categories beyond sports — politics, economics, weather, culture, and more.
Which platform should I start with?
If you already have a Robinhood account: Robinhood. If you want the widest selection and a demo account: Kalshi. If you prioritize low fees: Polymarket. If you want social features and community: OG. Most active traders maintain accounts on multiple platforms.
Can bots trade on prediction markets?
Yes. Automated trading is a significant and growing part of prediction market volume, particularly on Polymarket where the API infrastructure is most comprehensive. For more on how this is shaping the market, see our piece on AI trading bots in prediction markets.
Can I arbitrage between prediction market platforms?
Yes. When the same event is priced differently on two platforms, you can buy the cheap side and sell the expensive side for a near-risk-free profit. See our step-by-step arbitrage guide for how this works in practice.
