Anyone asking how to play on Polymarket: it honestly takes all of about ten minutes to learn. You buy Yes or No on a real question, the price is in cents, and a winning contract pays a dollar. What takes longer, and what actually decides whether you keep your money, is knowing where Polymarket's rules quietly split from Kalshi's, because most new traders arrive assuming the two big prediction market exchanges work the same way. They mostly do. Then a wide receiver gets scratched an hour before kickoff, and the two platforms hand you two completely different outcomes. That rule, the one I make every sportsbook friend read twice, is waiting a few sections down, and it is the single biggest thing this page will teach you.
The Quick Answer
To play on Polymarket as a US resident, you download the Polymarket App, verify your identity, deposit dollars, and buy Yes or No contracts priced from 1 to 99 cents; each contract settles at $1 if you are right and $0 if you are not, and you can sell at the live price any time before settlement. Polymarket and Kalshi run on the same basic machine, but they differ in five places that matter: how the venues are structured, what markets they carry, what trading costs, how player props settle when someone does not play, and which states can access each one. The prop settlement split costs sportsbook bettors real money when they do not see it coming; it is broken down below.
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Your First Trade, Start To Finish
Here is the whole mechanical loop, the part that really is easy.
- Get the app and verify. US trading runs through the Polymarket App, and signing up means full identity verification, the same kind a brokerage asks for. Polymarket's main website is view-only for US users; the app is where Americans actually trade.
- Deposit dollars. On Polymarket US your balance is real US dollars on a federally regulated exchange, not cryptocurrency.
- Pick a market and read its rules. Every market is a question with a named source and a deadline written into its rules text. The rules are the contract. Read them before the price.
- Buy Yes or No. Prices run from 1 to 99 cents, and the price is the market's live probability: a contract at 58 cents is the crowd saying roughly a 58% chance. There is no bookmaker on the other side, just other traders in an order book.
- Exit whenever you want. A contract is a thing you own. Hold it to settlement and collect $1 if you are right, or sell it early at the current price and take the gain or the loss now.
Run one small example and the loop clicks. Say an NFL market asks whether a receiver clears 70.5 receiving yards on Sunday and Yes trades at 58 cents. Every market has both sides, so No is trading at roughly 42 cents at the same moment; the two prices always add up to about a dollar because they are the same coin viewed from opposite faces. You buy 100 Yes contracts for $58, and that $58 is the most you can lose. If he clears the number, your contracts redeem for $100, a $42 profit before fees. If he piles up 55 yards by halftime and Yes reprices to 80 cents, you can sell right there for $80 and never sweat the fourth quarter. That middle exit is the piece sportsbook bettors are not used to, and it changes what a position even is: you are not picking a winner, you are trading a price that moves as the game does. New to converting cents into odds? Our guide to reading exchange prices as odds covers the arithmetic in five minutes.
Hold onto that 58-cent receiver of an example, because it comes back when we get to the rule this page exists for.
One Brand, Two Venues, And Why That Matters
The first real difference from Kalshi is structural, and it explains half the confusion you will read online.
Kalshi is one thing: a single US exchange regulated by the CFTC, the federal commission that oversees derivatives markets. Polymarket is one brand running two different venues. The original international exchange at polymarket.com is crypto-based, built its reputation on enormous election markets, and is view-only from the United States. Polymarket US is the newer, CFTC-regulated venue that trades in actual dollars through the Polymarket App. When someone tells you Polymarket runs on crypto, they are describing the international site; when this page says buy and sell, it means Polymarket US, which mechanically looks much more like Kalshi than like its own overseas sibling.
Why should a player care? Because advice on the internet constantly mixes the two venues up, and rules, fees, and access differ between them. If a claim about Polymarket sounds strange, the first question to ask is which Polymarket it describes. For the deeper mechanics of how any of these exchanges work under the hood, our explainer on how prediction markets work is the 101; this page stays on the practical differences.
The Menu And The Price Of A Trade
Structure settled, the next two differences are what you can trade and what it costs, and they pull in opposite directions.
| Polymarket US | Kalshi | |
|---|---|---|
| Built Its Name On | the brand's famous politics and news markets | the broadest US event menu |
| Sports Coverage | growing, deepest on marquee events | game lines, futures, and player props across major leagues |
| Also Carries | major world events and crypto prices | weather, economics, and awards markets |
| Trading Fee Shape | a published per-contract formula | a published per-contract formula, slightly higher |
| Fee On A 40-Cent Contract | about 1.4 cents | about 1.7 cents |
The row worth narrating is the fee row, because nowhere else do the two platforms let you compare exact numbers so cleanly. Both venues charge a small fee that peaks near 50 cents and shrinks toward the extremes. On a 40-cent contract, Kalshi's published formula works out to about 1.7 cents per contract and Polymarket US's to about 1.4 cents, with both venues rounding in their own favor on small orders. Neither number will change your life on one trade; both compound if you trade often. Fee schedules do change, so check each venue's current fee page before you size up, and for the full arithmetic our breakdown of how Kalshi's fees work shows the formula in action.
The menu difference is the honest tiebreaker between the platforms. Polymarket's identity is depth on the marquee political and cultural questions, the markets that made it famous. Kalshi has leaned into the wider everyday board, especially in sports, where its player prop and game markets have run across the major leagues all season. Plenty of traders simply hold both apps and let the market they want pick the venue, which is the conclusion our full Kalshi vs Polymarket comparison lands on too.
The Prop Rule That Catches Sportsbook Bettors
Now the promised rule. It separates people who read settlement terms from people who learn them the expensive way.
At a sportsbook, when you bet an NFL player prop and the player never plays, the standard outcome is a void: the bet is canceled and your stake comes back. Years of sportsbook habit train you to treat a scratched player as a refund. Prediction markets do not work that way, and the two exchanges handle it differently from each other on top of that.
| The Player Never Plays | What happens to your position |
|---|---|
| Typical US Sportsbook | prop is voided, stake returned |
| Polymarket US | market is graded anyway: a Yes or Over position resolves No |
| Kalshi | contract settles at the last price traded before play begins |
Read the Polymarket row again, because it is the huge one. On Polymarket, a player prop is graded even if the player does not appear in the game. The market asked whether the player would clear a number; a player who never takes the field clears nothing, so the market resolves No. Your 58-cent Yes from the earlier example does not come back as a refund. It goes to zero. The flip side is just as real: a No holder gets paid in full in the exact spot where a sportsbook would have handed both sides their money back, which means on Polymarket, a No position on a prop is partly a position on whether the player suits up at all.
Kalshi's approach is different again: rather than voiding or grading, its sports prop rules settle the contract at the last traded price before play begins. When the scratch news hits the market early and the price has already collapsed, that last price will reflect it; when the news never prices in, you land close to where you bought. Provisions truly vary by market and sport on both platforms, so the durable habit is the one from step three above: the rules text on the specific market page is the contract, and thirty seconds reading it beats any general rule this page can give you.
The rule in one line: a sportsbook voids a prop when the player sits, Polymarket grades it No, and Kalshi settles it at the last traded price. Check who is actually playing before you click Buy.
One more habit transfers straight from betting: know what the rest of the market thinks before you accept a price. We built our live odds screen to shop the number across every major book, and holding a sportsbook's price next to an exchange's cents on the same outcome is the fastest way to spot when one of them is off. One price is an opinion; two independent prices on the same event are the beginning of information.
Where You Can Play: The Two Lists Are Not The Same
The fifth difference is access, and I can only teach it as a method, not a list. Both platforms are federally regulated venues, legal where available, but several states restrict or contest event contracts, the legal fights are still moving, and here is the part almost nobody flags: the states where Polymarket US is unavailable are not the same states where Kalshi is. The divergence is real because the two companies fight separate court battles and hold separate postures state by state, so a state that cut off one app can leave the other alone. As of August 2026 the two restricted lists differ, and any specific list printed on a page like this would rot within months. So the method: check the eligibility screen inside each app before you fund anything; that screen, not any article, is the answer. Our guides to whether Polymarket is legal in the US and prediction-market legality state by state track the moving map. One more access note: these are CFTC-regulated event contracts rather than sports bets as a legal category, which is why the platforms operate in states where sportsbooks do not, and why the age line is 18+ rather than a casino's 21.
Claiming The OS4 Sign-Up Offer
Ready to try it? The honest disclosure comes first: OddsShopper is a Polymarket partner and may earn a commission if you sign up through our links, and we have no affiliate or commercial relationship with Kalshi, so on a page comparing the two, our financial incentive points toward Polymarket. Judge the comparison with that in mind; we would rather tell you where the money flows than pretend it does not.
Our link installs the Polymarket App and carries offer code OS4, currently: deposit $10, get a $20 trading bonus for new users. That bonus is a trading credit with the platform's own conditions attached, for use on the platform under the offer's current terms, not withdrawable cash, and the terms in the app on the day you sign up are the ones that count. Our Polymarket sign-up bonus guide walks through the offer and its conditions in full.
OddsShopper is a Polymarket partner and may earn a commission if you sign up through our links. 18+ Only. Restrictions and eligibility requirements apply. Not available in all jurisdictions. Trading is risky. 100% loss can occur. See polymarket.com/tos for more information. The Polymarket US App serves as an independent software provider and affiliate of Polymarket US and Polymarket Clearing, the CFTC-regulated exchange and clearing organization.
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FAQ: How To Play On Polymarket
Do I need cryptocurrency to play on Polymarket? Not in the US. Polymarket US, accessed through the Polymarket App, trades in actual dollars on a CFTC-regulated exchange. The international site at polymarket.com is the crypto venue, and it is view-only for US users.
What happens to my Polymarket prop if the player does not play? The market is graded, not voided: a Yes or Over position resolves No, and a No or Under position wins. That is the sharpest break from sportsbook habit on the platform, so check a player's status before buying Yes and read the specific market's rules text, since provisions can vary by market.
Can I cash out before a market settles? Yes, and it is half the game. Contracts trade continuously until resolution, so you can sell at the live price to take a profit or cut a loss, exactly like the 80-cent halftime exit in the worked example above.
Is Polymarket or Kalshi better for sports? Kalshi has historically carried the broader everyday sports menu, including player props across major leagues, while Polymarket US runs deepest on marquee events, politics, and culture. Many traders hold both and let the specific market and its price pick the venue; our platform comparison scores the matchup in detail.
How do I withdraw my money from Polymarket? On Polymarket US you withdraw dollars back out through the Polymarket App. Methods, timing, and verification steps are set by the platform and can change, so check the current terms in the app. One universal rule: bonus trading credit itself is not withdrawable; what you can cash out is the balance from settled or sold positions.
How much money do I need to start? The OS4 offer requires only a $10 deposit, and contracts cost under a dollar each, so you can learn the mechanics risking pocket change. Whatever you deposit, size positions so that a full loss, which is always possible, costs you nothing you care about.
So, how do you play on Polymarket? Mechanically: install the app, verify, deposit dollars, buy Yes or No in cents, sell whenever the price says you should. Practically: play it like someone who knows where the rules split from Kalshi, because the thread tying all five differences together is the same habit this page kept returning to. On an exchange, the rules text is the product, and the trader who reads it holds an edge over the trader who assumes. If you want to watch that kind of probability-first thinking applied to real slates every day while you find your footing, our free expert picks are a no-cost place to start.
Event contracts on any venue can lose their full value. Kalshi and Polymarket US contracts are CFTC-regulated derivatives, not sportsbook wagers; the international Polymarket exchange operates outside US regulation and is not available for trading to US residents. 18+, where each platform operates. Nothing on this page is trading advice, and nothing here is a pick or a recommendation. Play within your means.
