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What is Kalshi? The regulated prediction market, explained
Kalshi is the US-regulated prediction market. You trade event contracts that pay a dollar if an outcome happens and nothing if it doesn't — and the price is the market's probability. Here is how it works and what separates it from the crypto-native alternatives.
Kalshi is a prediction-market exchange based in the United States and regulated by the Commodity Futures Trading Commission (CFTC). Instead of betting on a horse or a game, you trade event contracts: instruments that pay $1.00 if a specified real-world event occurs and $0.00 if it does not. Elections, economic data, sports, weather, and company outcomes all trade this way. The defining feature is the same as every prediction market: a contract's price between $0 and $1 is the market's implied probability.
How the pricing works
A Kalshi contract is binary. Buy "Yes" at $0.55 and you risk $0.55 to win $1.00 if the event happens; if it doesn't, the contract expires worthless. Sell before resolution and you lock in whatever price the market gives you. Because the payoff is fixed at $1, the price you pay is a direct read on probability: $0.55 means the market thinks there is roughly a 55% chance. As traders react to news, that number moves — it is a live, crowd-sourced forecast.
This is worth pausing on, because it is the same mechanic as a sportsbook or an insurance market, but Kalshi frames it as a financial exchange. You are not placing a bet with a house that sets the odds; you are trading against other participants, and the price is set by supply and demand.
The 30-second version: a Kalshi contract pays $1 if you're right and $0 if you're wrong. Its price between $0 and $1 is the market's probability. You can buy and sell before the event resolves, so you are not locked in until settlement.
What makes Kalshi different: the regulation
The reason Kalshi comes up alongside Polymarket is that the two represent opposite ends of the regulatory spectrum. Kalshi operates as a CFTC-regulated Designated Contract Market, which means it has explicit US regulatory approval to list event contracts. You open a brokerage-style account, fund it in dollars, and trade under the exchange's rules. For US users this is the compliant path; for non-US users, availability depends on where you live.
That regulation is a real difference, not a marketing line. It means defined rules for listing markets, resolving disputes, and handling customer funds — the things that are murkier on offshore or crypto-native venues. It does not make the contracts any less speculative; it makes the venue itself more structured.
How to read a market before you trade
Every Kalshi market has a clear resolution rule, but "clear" does not mean "favorable." Before you put money in, read three things:
The resolution criteria
Exactly what counts as the event happening, and as of when. "Will inflation fall in 2026?" can resolve on a specific CPI print on a specific date. Know which number, from which source, and by when.
The price, not the story
A contract at $0.90 is the market saying 90%. If you think it is 95%, the trade is a thin-margin bet on being more right than the crowd. The implied probability is your baseline; your edge has to beat it.
The liquidity
Can you exit before resolution? Thin markets have wide spreads and few counterparties. Check the open interest and the bid-ask spread, not just the last price.
The risks worth taking seriously
You can lose the full premium. A contract that resolves against you pays $0. There is no partial credit and no "close enough." Size positions accordingly.
Regulation is not a guarantee of fairness. A regulated venue still lists markets on ambiguous events, and resolution disputes happen. Read the rules; do not assume the regulator will catch a bad market for you.
Tax and account rules apply. Event-contract gains and losses are taxable, and the account is tied to your identity and jurisdiction. This is a feature of the regulated structure, but it means the paperwork is real.
Emotional bias is expensive. Prediction markets feel like forecasts, and people overestimate their own. The price already aggregates everyone else's view — your job is to find where you disagree with the crowd and are right often enough to profit after fees.
Kalshi vs Polymarket — the quick read
Regulated US exchange
- CFTC-regulated Designated Contract Market
- Dollar settlement through a brokerage account
- US-person friendly, state rules vary
- Centralized custody of funds
Crypto-native, on-chain
- Polygon blockchain, self-custodied positions
- USDC settlement via a crypto wallet
- Global access with US restrictions
- Smart-contract and wallet risk
The probability mechanics are identical; the legal footing and the settlement rails are not. For the deeper mechanics of how these markets aggregate information, see how prediction-market odds work. For the crypto-native side, see what is Polymarket.
A note on where NexFlow fits
These guides are educational — for the venues themselves, Kalshi and Polymarket publish their own terms, rules, and fees, and those documents are what to read before you trade. If you trade crypto spot or perps, NexFlow gives you live prices, depth, and safety checks before you swap, and the guides in this section are here to help you read any market more safely.
Frequently asked
What is Kalshi?
Kalshi is a US-based exchange for event contracts, regulated by the CFTC. Users trade contracts that pay $1 if a specified real-world event happens and $0 if it does not. Because contract prices sit between $0 and $1, the live price is the market's implied probability of the outcome.
Is Kalshi legal in the US?
Kalshi operates as a CFTC-regulated Designated Contract Market, which makes it one of the few prediction-market venues with explicit US regulatory approval. It is available to US persons through a brokerage account, subject to the rules of the exchange and the CFTC. Availability can still vary by state and by account verification.
How do Kalshi prices work?
Each contract pays $1 if the event resolves in your favor and $0 if it does not. A contract trading at $0.40 implies the market assigns roughly a 40% chance to that outcome. Buying at $0.40 risks $0.40 to win $1.00, so the price is simultaneously a probability, a cost, and a payout.
What is the difference between Kalshi and Polymarket?
Kalshi is a regulated US exchange settled in dollars through a brokerage account under CFTC oversight. Polymarket is crypto-native, built on the Polygon blockchain, settled in USDC, and self-custodied. The probability mechanics are similar; the legal footing and settlement rails are fundamentally different.
Can you lose money on Kalshi?
Yes. If the event resolves against your position, the contract pays $0 and you lose the full price paid. Prices can also move against you before resolution, so you can sell at a loss. Event contracts are speculative instruments, not savings accounts.