Prediction Markets Deep Dive

What a Prediction Market Actually Is

A prediction market lets people bet on the outcome of a future event — will a specific candidate win a specific election, will a specific bill pass, will a specific movie earn more than X on opening weekend. Each outcome is a tradeable share that pays $1 if the outcome happens and $0 if it doesn't. If a share for 'Candidate X wins' trades at $0.62, the market is collectively pricing that outcome at 62% probability. Two of the best-known prediction markets are Polymarket (crypto-native and USDC-settled on Polygon for its international site; its separate U.S. venue, Polymarket US, has been a CFTC-designated contract market since 9 July 2025) and Kalshi (CFTC-regulated exchange, dollar-settled, based in the U.S.).

Why Prices Are Interpretable as Probabilities

The arbitrage argument: if 'Yes' + 'No' shares on a binary outcome traded for anything other than exactly $1 combined, someone could in theory buy both, hold to resolution, and capture the difference (ignoring fees and platform risk). So the market pushes the two share prices to sum to about $1, and each price is naturally read as the market's probability estimate. This isn't a coincidence — it's mechanical. What varies is how much weight a market's price carries: a market with $100M of liquidity is more informative than one with $10K, because the depth of book reflects how much real money is willing to defend the current price.

The Regulatory Divide

In the U.S., prediction markets on political events have been legally contested for years. Kalshi won a landmark court case in September 2024 that let it list contracts on which party would control the U.S. House and Senate; that was widely seen as opening the door to broader political-event contracts, and the CFTC dropped its appeal of that ruling in May 2025. Kalshi's sports contracts are a separate fight with the states: the Third Circuit ruled for Kalshi against New Jersey in April 2026, the Ninth Circuit ruled in August 2026 that Nevada can enforce its gambling laws against Kalshi, and New Jersey petitioned the Supreme Court on 2 September 2026. After the 2022 CFTC settlement ($1.4 million civil penalty, wind-down of non-compliant markets, cease-and-desist), the international Polymarket site was not open to U.S. users; as of July 2026 Polymarket had applied to the CFTC to change that (CryptoBriefing via KuCoin News). Separately, Polymarket acquired the CFTC-licensed exchange QCEX; that exchange (QCX LLC, now operating as Polymarket US) has been a designated contract market since 9 July 2025. According to Covers (12 May 2026), Polymarket US began releasing U.S. customers from its waitlist in December 2025, and on 12 May 2026 its iOS app dropped the invitation-code screen, so signing up no longer requires an access code. This regulatory divide shapes where each platform's liquidity comes from — the international Polymarket site draws global crypto-native trading, while the U.S. venues serve U.S. users under CFTC oversight.

• Prediction markets let people bet on future events with share prices interpretable as probabilities
• Polymarket = crypto-native, USDC on Polygon (international site); Polymarket US is a separate CFTC-designated venue (since July 2025)
• Kalshi = CFTC-regulated, dollar-settled; its sports contracts are in litigation with states (as of October 2026)
• Deep-liquidity markets are more informative than thin ones