Prediction markets turn opinions about the future into tradable contracts, and Polymarket and Kalshi have turned that idea into a multi-billion dollar business by letting traders bet real money on everything from elections to Fed decisions.
You've probably seen a headline that says something like "Polymarket gives it 62% odds" attached to a story about an election, a Fed rate decision, or even whether a celebrity breakup happens before year end. That percentage isn't a poll and it isn't a pundit's guess. It's a price, set the same way a stock price gets set, by people putting money on one side of a bet and other people taking the other side.
A prediction market is a place where you can buy and sell contracts tied to a real-world event with a yes or no outcome. If you buy a "Yes" share on "Will the Fed cut rates in September" and it resolves yes, your share settles at $1. If it resolves no, it settles at zero. The price of that share while the market is open, say 62 cents, reflects what traders collectively think the odds are. Buy at 62 cents and win, you make 38 cents. Buy at 62 cents and lose, you lose the 62 cents. That's the entire mechanism. No fund manager, no analyst report, no central authority declaring the odds. Just buyers and sellers moving a price around until it settles somewhere near what informed money actually believes.
Polymarket runs on Polygon, an Ethereum scaling network, and settles trades in USDC, a dollar-pegged stablecoin. You deposit USDC, pick a market, and buy shares directly against other users through an order book or an automated market maker, depending on the market's liquidity. There's no broker in the middle taking your order and matching it manually. Smart contracts hold the funds in escrow until the event resolves, then pay out automatically. Because it runs on crypto rails rather than a bank account, Polymarket can take users from nearly anywhere in the world within minutes, and it did exactly that during the 2024 US presidential election, when volume on its 2024 election market alone topped $3.6 billion according to Polymarket's own published data, dwarfing anything a traditional pollster ever touched.
Resolution is the part people underestimate. Someone has to decide what actually happened. Polymarket relies on UMA's Optimistic Oracle, a decentralized dispute system where a proposer submits the real-world answer and anyone can challenge it within a window by staking a bond. If nobody challenges, the answer stands. If someone does, it goes to a vote among UMA token holders. It's clever, but it's not immune to mess. In a market asking whether Trump would say a specific phrase during a debate, the resolution process drew criticism after the eventual call was disputed by traders who felt the oracle judges got it wrong. That fight didn't stop the platform, but it's the clearest illustration of the real weak point in this entire model: the market can only be as trustworthy as whoever settles it.
Kalshi vs Polymarket, and why one has regulators and the other doesn't
Kalshi takes the opposite path. It's a federally regulated exchange, licensed by the Commodity Futures Trading Commission as a designated contract market, the same category of regulator that oversees futures exchanges like the CME. You fund a Kalshi account with dollars through a regular bank transfer, not crypto, and every contract you trade has been reviewed under CFTC rules before it goes live. That regulatory approval is also why Kalshi moves slower and covers a narrower range of topics than Polymarket, which will list a market on almost anything traders want to bet on.
The two platforms actually diverged over the exact same product: 2024 election contracts. The CFTC tried to block Kalshi from listing election-outcome markets, arguing they amounted to unregulated gambling on political contests. Kalshi sued and won in federal court in 2024, a ruling that let it list election markets under CFTC oversight while Polymarket, unable to legally serve US customers directly, was accused by the Department of Justice in a probe reported by Bloomberg of allowing Americans to trade anyway through geo-blocking workarounds. Polymarket has denied wrongdoing and stated it does not knowingly serve US retail customers. That single legal fight is the cleanest way to understand the difference between these platforms: Kalshi bet on winning permission first and building second, Polymarket bet on building a global market first and dealing with permission later.
Frankly, both bets have paid off so far, which tells you something about how immature the regulatory picture still is. Kalshi has since expanded into sports outcomes, weather, and even inflation prints, while Polymarket in 2025 confirmed talks to reenter the US market through a regulated acquisition, buying a CFTC-licensed exchange called QCEX, according to reporting from Reuters. That's not a company staying outside the system by choice. It's a company that spent two years testing exactly how far outside the system it could operate before deciding the fine print was worth paying for.
Who actually profits from a prediction market
The platforms make money on trading fees and spreads, not by picking a side. Kalshi charges a small fee on trades and at settlement. Polymarket has historically kept trading fee-free for users while earning revenue from market-making partnerships and, increasingly, from data licensing. That last part matters more than it sounds. News organizations, including some that report on Polymarket odds as if they were polling data, are increasingly citing the platform's real-time prices as a proxy for public sentiment, which means Polymarket's actual product isn't the bets themselves. It's the price feed those bets generate.
The traders who consistently profit are rarely the ones betting on a hunch about who wins an election. They're the ones who find a market mispriced relative to information that hasn't fully spread yet, the same edge that works in options trading or sports betting. When Polymarket's market on a Federal Reserve decision moves two points in either direction ahead of an official announcement, that shift is often driven by someone trading on a leak, an early data release, or simply faster analysis than the rest of the crowd, not by a random gut call.
None of this makes prediction markets a crystal ball. They're only as good as the money and information behind them, and thin markets on obscure topics can be moved by a single large bettor in a way that a deep, liquid market on a presidential election cannot. But as a real-time aggregator of what informed people are willing to pay to be right, they've already proven more responsive than a monthly poll, and that's exactly why newsrooms keep quoting them.
Also read: What Is a Vesting Cliff in Crypto and Why It Decides Who Actually Gets Paid • What Is Liquid Staking? How Tokens Like stETH Actually Get Repriced • What Is Real World Asset Tokenization and How It Actually Works
