- An MLB contract is a $1 Yes/No share on an outcome such as a game winner or the World Series, priced from 1¢ to 99¢. A winning share pays $1.
- The price is the market's implied probability, not a forecast that the result will happen. A 58¢ favourite still loses about 42 games in 100.
- MLB has been reported to have a league deal with Polymarket, and Kalshi and Novig have team deals. MLB also signed an agreement with the CFTC in March 2026.
- A lockout is expected after 1 December 2026, so 2027 futures carry extra risk. Read how a contract settles if the season is cut short.
MLB prediction markets turn baseball results into tradeable shares. Instead of taking a sportsbook's line, you buy "Yes" or "No" on an outcome, for example Will the Brewers win Game 1? or Will a team win the 2027 World Series?, from other traders. The share pays $1 if you are right, so its price is the market's implied probability. This page explains how MLB contracts work, what they cost after fees, how they settle in odd situations, what MLB and its teams have done with prediction markets, and where they are legal. It is part of our sports event contracts guide, and the sportsbook side of the same sport is in MLB betting.
How MLB prediction market contracts work
Every contract is a simple question with a $1 payout. If "Yes, the Brewers beat the Rays" trades at 58¢, the market rates the Brewers at about a 58% chance. Buy at 58¢ and you make 42¢ per share if they win, before fees. If they lose, you lose your 58¢.
Two things make this different from a bet slip:
- You can sell at any time. If your team scores early, the price rises and you can sell to lock in a profit before the last out. If it goes against you, you can sell to limit the loss.
- You trade with people, not the house. There is no margin built into the odds, but there are trading fees and a gap between the best buy and sell price.
New to this? Start with how prediction markets work, then come back.
MLB contract types
| Contract type | Example | Typical availability |
|---|---|---|
| Game winner | "Will the Brewers beat the Rays?" | All sports platforms |
| Run line and total | "Will the game have more than 8.5 runs?" | Kalshi, Polymarket, Novig, ProphetX, sportsbook-style apps |
| Player props | "Will a pitcher strike out 7+?" | Kalshi, Novig, ProphetX and others |
| Combos (parlays) | Several outcomes in one contract | Kalshi, Novig, ProphetX, FanDuel Predicts, DraftKings Predictions |
| Series winner | "Will the Brewers win the World Series?" | Most platforms |
| Futures | Next year's World Series, pennants, MVP, Cy Young | Most platforms |
| Live trading | Prices update during the game | Kalshi, Polymarket, Novig and others |
Examples are illustrative, not live markets. Menus change by platform and state. The 2026 World Series runs from 23 to 31 October, and the 2027 regular season is scheduled to run from 24 March to 26 September.[1][2]
Worked example 1: a game contract
Say you buy 60 "Brewers win" contracts at 58¢ on Kalshi, as a taker.
| Item | Amount |
|---|---|
| Cost of 60 contracts at 58¢ | $34.80 |
| Taker fee (0.07 × 60 × 0.58 × 0.42, rounded up) | about $1.03 |
| Total cost | about $35.83 |
| Payout if the Brewers win | $60.00 |
| Profit if they win | about $24.17 |
| Loss if they lose | about $35.83 |
Your all-in price is about 59.7¢ per contract, a little above the 58% on the screen. Polymarket US charges a very similar taker fee.[5][6] Resting limit orders are often cheaper. Work out your own numbers with our fee calculator.
Worked example 2: a World Series future
Say you buy 100 contracts at 8¢ on a team to win the 2027 World Series.
| Item | Amount |
|---|---|
| Cost of 100 contracts at 8¢ | $8.00 |
| Taker fee (0.07 × 100 × 0.08 × 0.92, rounded up) | about $0.52 |
| Total cost | about $8.52 |
| Payout if they win | $100.00 |
| Loss if they don't | about $8.52 |
The all-in price is about 8.5¢, roughly 11.7 in decimal odds before any selling costs. The catch is time and risk: your money is tied up until October 2027, and if there is a lockout, the season could be delayed or shortened. Read how the contract settles in that case. Our price to odds converter does the conversion both ways.
MLB prediction market prices vs sportsbook odds
To compare, divide 1 by the price: a 58¢ contract is about 1.72 in decimal odds before fees, or about −138 in American odds. A sportsbook moneyline of −140 implies 58.3%, but that figure still includes the book's margin. Use the contract vs sportsbook odds calculator to compare a specific price.
| Where you buy | Price per $1 payout | Implied chance | Comment |
|---|---|---|---|
| Sportsbook moneyline at −110 on both sides | 52.4¢ | 52.4% | Margin built in |
| Exchange at 51¢, resting limit order | 51.0¢ | 51.0% | Cheaper than −110, if your order fills |
| Exchange at 51¢, taker on Kalshi | about 52.75¢ | about 52.75% | Slightly dearer than −110 |
| Sportsbook-style prediction app at 51¢ | about 53¢ | about 53% | Fee is about 2% of the payout |
Moneyline prices differ between books, so compare the all-in price on the exact game. See prediction markets vs sportsbooks for the full comparison, or MLB betting for the traditional route.
Liquidity, spreads and exiting early
Liquidity. Big games, the postseason and the World Series are the deepest baseball markets. A normal regular-season game can be thinner, and props and early-season futures thinner still. A market order can fill at a worse price than you expect, so use limit orders and read prediction market liquidity.
Exiting early. Selling before the game ends is the biggest practical difference from a sportsbook. You sell to another trader at the best bid, and you pay a fee on the sale. Baseball prices move with every run, so the bid can shift fast.
How MLB contracts settle: rules to read first
Every contract has its own rulebook, with a named source, that decides what happens in odd situations. The table shows what to look for, not what every platform does.
| Situation | What to check in the contract rules |
|---|---|
| Extra innings | Whether the winner includes extra innings (game winners normally do) |
| Listed pitcher doesn't start | Whether the contract still settles on the game result |
| Rain delay or postponement | The deadline to complete the game and the fallback settlement |
| Shortened game | Whether five innings (or 4.5) make a game official |
| Suspended game | Whether the contract waits for the resumed game |
| Player prop, player doesn't play | Whether the contract is voided, or settles at No |
| Futures and a lockout | What happens if the season is delayed, shortened or cancelled |
Read the rules on the market page before every trade. For how settlement and disputes work, see prediction market resolution.
What MLB has done with prediction markets
MLB is the major US league closest to prediction markets, according to reports. In March 2026, press reports said MLB signed a multiyear deal making Polymarket its exclusive prediction-market partner and the only platform allowed to use team marks, though the reported value varied between sources.[3] The same month MLB announced an agreement with the CFTC, the federal regulator. Several teams have gone their own way: the Mets with Novig, the Yankees with Polymarket, and the Braves, Red Sox, Dodgers, Padres and Giants with Kalshi, in multiyear brand partnerships.[4] Other teams, such as the Guardians, Nationals, Phillies and Rockies, said they had no such deals. As of late August, Kalshi was reported to be in talks about a league-level deal as well.
What this means for you: baseball contracts are likely to get more visible and deeper, but league deals can change which platform has which markets, and legal fights can switch a platform off in your state. Kalshi's sports markets were blocked in Massachusetts pending a ruling from the state's highest court, which affects the Red Sox partnership.
Are MLB prediction markets legal?
Kalshi and Polymarket US are regulated by the CFTC, so your money sits with a federally supervised exchange. But many states say sports contracts are unlicensed betting. In October 2026 they were blocked in Nevada and Michigan, Ohio ordered platforms to stop, and cases were running in other states.[7] Platforms use your location to hide markets you cannot trade. Rules change almost weekly, so check are prediction markets legal and our state tracker for sports contracts before you deposit. Age limits are 18+ on most platforms and 21+ on some.
Where to trade MLB contracts
- Kalshi: the deepest MLB markets and the widest menu, including props, futures and combos.
- Polymarket: reported as MLB's league partner, with sports contracts on its US app, where available.
- Novig: free pre-game straight trades, sports only.
- ProphetX: a peer-to-peer exchange reported in most states.
- FanDuel Predicts and DraftKings Predictions: sportsbook-style apps, mainly in states without legal sportsbooks.
- Robinhood and Crypto.com: sports markets inside apps you may already use.
Compare all of them in our list of the best prediction market sites. We rank them on fees, liquidity, markets, safety and legality, using published terms and independent reporting rather than our own real-money tests.
Tips for trading MLB contracts
These are habits that reduce mistakes, not a way to guarantee profit.
- Treat the price as an estimate. 58¢ is not a prediction that the team will win.
- Count the all-in cost. Add the fee and the spread, then compare with a sportsbook.
- Use limit orders unless you must trade now. See order books and limit orders.
- Check the starting pitchers and the contract's rules if one is scratched.
- Be careful with 2027 futures. A lockout could delay or shorten the season, and your money is tied up for months.
- Read the rules for extra innings, rain and postponements before you trade, not after.
- Keep stakes small and set a weekly budget.
For the sportsbook side of baseball, including the World Series and 2027 calendar, see our MLB betting page.
FAQ: mlb prediction markets
How do MLB prediction markets work?
You buy a $1 contract on an outcome, for example "Will the Brewers win?", from another trader. The price in cents is the market's implied probability. If the outcome happens the contract pays $1, if not it pays nothing, and you can usually sell before the game ends.
Does MLB have a deal with prediction markets?
Reports from March 2026 say MLB signed a multiyear deal making Polymarket its exclusive prediction-market partner. Kalshi has brand partnerships with several teams, and the Mets and Yankees have deals with Novig and Polymarket. Terms were not clear in the reports we found.
What MLB contracts can I trade?
Game winners, run lines and totals, player props such as strikeouts, hits and home runs, and futures such as the World Series, pennants and awards are listed on the larger platforms. Menus differ by platform and state.
What happens if the listed pitcher doesn't start?
There is no standard rule: each contract states its own. Some settle on the game result regardless of the starter. Check the rules link on the market page.
What happens to an MLB contract if a game is rained out?
Each contract states a rule, usually a deadline by which the game must be played, after which it settles under a stated fallback. Check the rules on the market page.
What happens to a World Series contract if there's a lockout?
It depends on the contract. Futures usually say what happens if a season is cancelled or shortened. Read the rules before you buy a 2027 outright, because your money may be tied up for a long time.
Are MLB prediction markets legal?
Kalshi and Polymarket US are regulated by the CFTC, but states argue sports contracts are unlicensed betting. In October 2026 they were blocked in Nevada and Michigan and challenged elsewhere, and Massachusetts blocked Kalshi's sports markets pending a court ruling.
Sources
- 2026 MLB Playoff and World Series schedule — MLB.com ↩
- MLB set for earliest Opening Day in 2027, if there is a season — ESPN ↩
- MLB and Polymarket — Front Office Sports, 19 March 2026 ↩
- Kalshi sweeps up five MLB franchises in multi-year sponsorship deals — Sportcal ↩
- Kalshi fee schedule — Kalshi ↩
- Fee schedule (effective 7 October 2026) — Polymarket US ↩
- Are sports prediction markets legal? Status of Kalshi and Polymarket in all 50 states — CBS Sports, 8 October 2026 ↩