A prediction market combo (also called a prediction market parlay or multi-leg contract) bundles several event contracts into one position. It pays $1.00 per contract if every leg wins and nothing if any leg loses, much like a parlay at a sportsbook. The difference is that combos are priced and traded like financial contracts rather than set by a bookmaker.

Yes, you can. Kalshi, Polymarket and Novig all offer ways of combining several prediction markets into one trade. They might be called combos or parlays on different platforms, but you will have the option to take positions on multiple event contracts as one trade.

Combos are most commonly available for sports, including NFL odds, MLB odds, college football, basketball, tennis and MMA. Kalshi's combos are also available across other event types, including crypto, politics and entertainment. Polymarket's combos and Novig's parlays are sports only for now.

Note the availability of prediction market parlays can depend on the sport, platform and your location:

• Some markets can't be combined: Certain events and contracts aren't eligible, and a combo button often appears only once lineups are confirmed.
• Not every platform has the feature: Also, some platforms might limit combos to sports contracts, while others allow combos on politics, entertainment and more.
• Not every state allows it: Access to Kalshi, Polymarket and Novig varies by state. Check the platform's availability for your location before you trade.

Can you parlay on Kalshi?

Yes. Kalshi launched combos for all users in December 2025, and they now make up a large share of its volume.

Kalshi offers its own customizable combo builder for trading. You add legs from different markets, including different games and same-game props, and Kalshi dynamically prices these as you add using its RFQ (request for quote) system. Other market participants respond with a quote, and you see the price before you confirm. Each combo then trades as its own market with its own order book.

Read our full guide to Kalshi combos and prediction market parlays.

What Kalshi does well

• Deep liquidity: Kalshi handles about three-quarters of all prediction market volume (75% in September 2026). That makes a quote and a fill more likely than on newer venues.
• A flexible builder: Including same-game combinations and a wide range of player props. Build a combo from any eligible event page, or from the live sports tab.
• No fixed limit on legs: Though note prices and fills get less reliable the more legs you add. Three or four legs is a more realistic target.

You can read more about the brand on our Kalshi promo code page.

Can you parlay on Polymarket?

Yes. Polymarket calls these multi-leg trades combos, and they're offered exclusively on sports for now. Polymarket combos first arrived in the mobile app in August 2026.

You pick your legs, competing market makers quote a price for the whole combo through a request-for-quote (RFQ) system similar to Kalshi's, and you see the price before you confirm.

What Polymarket does well

• Wide market variety: You can start a combo from any eligible sports market page, and mix games and sports in one combo, such as an NBA moneyline with an NFL spread.
• Fast-growing liquidity: Polymarket combos have become a significant part of Polymarket trading (reaching over 20% within a week of the app rollout), and quotes are generally available on major games and some niche markets.
• A way out before settlement: Like any Polymarket position, you can sell a combo before it settles if there's a buyer.

To learn more about Polymarket, see our Polymarket promo code page.

Building a prediction market parlay or combo works in much the same way on every platform. You pick your legs in the platform's combo builder, request a price, check the payout and confirm.

Unlike a sportsbook, the price comes from quotes by market makers, rather than fixed odds, so it can move before you confirm. Depending on the platform, you may also be able to cash out before every leg settles.

How to make a combo on Kalshi

1. Find the game: Open Kalshi and go to the sports market for the game you want.
2. Pick your legs: Choose your first leg by picking Yes or No on a contract, then add more legs from other markets or games.
3. Check the combo: Open the combo builder and check the legs you've selected. Kalshi sends your combo to market makers and shows you a quote and the payout.
4. Confirm: Enter how much you want to trade, review the payout and confirm.

Tip: If the combo shows "payout unavailable," longer or more complex combos, quiet markets, and combos built well before the event can all have fewer market makers willing to quote them. Try fewer legs, a different combination or check back closer to game time.

How do Kalshi combos work?

Kalshi combo rules:

• Each combo is its own market: It resolves to the product of its legs' values and pays a maximum of $1.00 per contract.
• Settlement: Typically 1 to 12 hours after the last leg resolves, so a combo may settle later than the final game.
• Prices come from quotes: Kalshi uses a request-for-quote system, where market makers respond to your request with a price.
• If a leg can't resolve normally: The leg settles under the rules of its own market, and the combo isn't refunded or canceled. A leg can settle at a value between $0 and $1: if one leg settles at $0.70 and the other two at $1.00, the combo pays $0.70 per contract.
• Fees apply: Kalshi charges takers a fee that peaks at around $1.75 per 100 contracts (at a 50¢ price). Combos are usually priced lower, where the fee is smaller, at about $0.90 per 100 contracts at 15¢. There's no settlement fee. Check Kalshi's fee schedule for current charges.

How to parlay on Polymarket

1. Build a Combo: In the Polymarket app, tap Build a Combo at the bottom of the home screen.
2. Select legs: Select 2 to 10 sports legs. They can come from different games and even different sports.
3. Request a price: Request a price. Competing market makers respond with a quote.
4. Confirm: Review the price and payout, then confirm.

How do Polymarket combos work?

Polymarket combo rules:

• A combo is a single position: It combines 2 to 10 markets, and each leg carries the side you took. It settles once, at a single value. A leg is worth the same inside a combo as it is on its own.
• Payout: A winning leg is worth $1.00 and a losing leg $0. The combo pays the product of the legs' values, so one losing leg means $0 no matter how the others finish.
• If a leg can't resolve: It settles at its last fair market price, set by the Settlement Committee, whose decisions are final. The leg isn't removed from your combo.
• Prices: Combos trade on their own order book, and you can request quotes from market makers or fill against resting orders.
• Fees: Polymarket charges takers a fee that peaks at around $1.50 per 100 contracts. An October 2026 amendment removed the maker fee and maker rebate on combos. Check the current fee schedule.

Tips before you build

• Check the combo price is fair: Before you confirm, multiply the prices of the legs and compare the result with the quote. If it's well above, consider fewer legs or comparing another venue. Quotes can change or expire, so check the price again when you confirm.
• Watch for correlated outcomes: Legs that tend to happen together (such as a game's Over and a quarterback's passing yards Over) are more likely to win together than their prices multiplied suggest. A fair quote on those can sit above the multiplied price.
• Don't add too many legs: Every leg lowers the probability that the whole combo wins, and thins out liquidity.
• Read the rules: Check each leg's contract and settlement rules to see what happens if a game is postponed or a player doesn't play.
• Start small: Treat combos as a low-probability, high-payout product.

If you want to compare the same leg across platforms, use our arbitrage scanner. For ideas on where to start, see our prediction market picks.

Prediction market combos and sportsbook parlays both combine several selections into one position where every leg has to win, but they aren't interchangeable as betting or trading options.

A key difference is how they're priced and managed. A sportsbook sets the odds and takes the other side of your bet. A combo is a contract priced by market makers, whose quotes follow the prices of the underlying markets. Both prices can move before you bet or trade, and both are locked in once you confirm.

Combos are riskier than single trades because every leg has to win for the combo to pay out. Each leg you add lowers your overall chance of success. A three-leg combo where each leg is around 60% likely, for example, only has about a 22% chance of winning.

An occasional big payout is unlikely to make up for the losses and fees that build up along the way. Judge each combo on its value to your normal trading style, and avoid chasing the biggest possible return.

• Set a budget first: Decide what you're comfortable losing before you start, and keep combo stakes smaller than your usual single trades.
• Stick to what you know: Trade sports and markets you follow closely, so the outcomes and conditions are familiar.
• Check every leg: Read each leg's settlement rules before you confirm, including how injuries, postponements, and overtime are handled.
• Don't chase losses: Avoid adding more legs or raising your stake to win back money you've lost.
• Use the platform's tools: Most apps let you set deposit or trading limits, take a break, or self-exclude.