MLB prediction market promos arrive at the biggest stage of the season. Five offers sit open for new users before the Tampa Bay Rays and Milwaukee Brewers begin today, Friday, Oct. 23, 2026, at 8 p.m. ET on FOX. Neither franchise owns a World Series title, so Major League Baseball crowns a first time champion this week.
Prediction market apps work differently from online sportsbooks. You buy a contract tied to an outcome, and it pays $1 if that outcome happens. Prices run from 1¢ to 99¢ and double as the market’s implied probability, so a 61¢ contract means traders give that outcome roughly a 61% chance.
Milwaukee trades at 61¢ to win Game 1 on Polymarket today. My preferred Rays vs. Brewers prediction is Milwaukee to take Game 1, and the full breakdown follows below.
Best MLB Prediction Market Promos for World Series Game 1
This table lays out all five MLB prediction market promos side by side. Each one is available exclusively new users, and each carries its own terms:
| MLB Prediction Markets | MLB Prediction Market Promos | Sign-Up Link |
|---|---|---|
| Polymarket | Deposit $10, Get $25 | ACTION |
| Kalshi | Trade $25, Get $55 | ACTION55 |
| Novig | Deposit $10, Get $50 in Trade Credits | ACTION |
| ProphetX | Trade $50, Get $75 | TANBONUS |
| FanDuel Predicts | Trade $1 for 5 Days, Get $100 | Click Here |
Which MLB Prediction Market Promo Fits You?
The right offer depends on how much you want to put in up front. Here is how the five Brewers vs. Rays prediction market promos stack up:
- Lowest entry: FanDuel Predicts asks for $1 a day over five days.
- Biggest bonus for a small deposit: Novig turns $10 into $50 in Trade Credits.
- Best match for a $10 deposit: Polymarket gives $25 on the same $10.
- Most bonus per dollar traded: Kalshi returns $55 on $25 in trades.
- Largest single payout on trade volume: ProphetX gives $75 after $50 in trades.
How to Claim MLB Prediction Market Promos
The steps look nearly identical across all five platforms. Follow these steps to harness hundreds of dollars in MLB prediction market promos:
- Pick the platform from the table above.
- Create your account and enter the promo code at signup (FanDuel Predicts needs no code).
- Verify your identity and confirm your state is eligible.
- Make the qualifying deposit or trade listed in the offer.
- Read the bonus terms before you place your first Game 1 position.
Brewers vs. Rays Prediction: Brewers Win Game 1
My pick is the Brewers to win Game 1 at about 61¢ on Polymarket, where $100 returns around $164. Milwaukee earns the edge for four reasons:
- Best record in baseball: The Brewers finished 103-59, and they won two of three against Tampa Bay in the regular season.
- Fresh bullpen: Milwaukee swept the Dodgers in the NLCS and has rested its whole staff.
- Ace on the mound: Jacob Misiorowski went 16-5 with a 1.80 ERA and 252 strikeouts over 174.2 innings.
- Home field: Games 1 and 2 both take place at American Family Field.
The Rays push back with Drew Rasmussen, who posted a 1.73 ERA over 15 starts since the All-Star break. Misiorowski also has not finished the fifth inning in his two postseason starts, so I watch the early innings closely.
The details below cover when and where to watch.
| Detail | Info |
|---|---|
| Date | Friday, Oct. 23, 2026 |
| Time | 8 p.m. ET |
| TV | FOX, FOX Deportes |
| Streaming | FOX One |
| Location | American Family Field, Milwaukee |
| Likely Starters | Drew Rasmussen (Rays), Jacob Misiorowski (Brewers) |
If you like my analysis and breakdown of Brewers vs. Rays, sign up with the MLB prediction market promos below to trade World Series Game 1.
Best Brewers vs. Rays Prediction Market Promos Explained
1. Polymarket
Our Action Network Polymarket promo code ACTION gives new users a $25 trading bonus once a $10 deposit clears after registration. Polymarket lists both a Game 1 winner market and a World Series winner market (along with other markets). This makes Polymarket the cleanest place to take the Brewers or Rays in Game 1 today.
| Polymarket Promo Code | Polymarket Sign-Up Bonus | Polymarket States Available |
|---|---|---|
| ACTION | Deposit $10, Get a $25 Trading Bonus! | AK, AL, AR, CA, CO, CT, DC, DE, FL, GA, HI, IA, ID, IN, KS, KY, LA, ME, MN, MO, MS, NC, ND, NE, NH, NJ, NM, NY, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WI, WV, WY |
2. Kalshi
The Kalshi promo code ACTION55 gives new users $55 in bonus credits after $25 in qualifying trades are submitted with one of the most generous MLB prediction market promos on the board. Kalshi prices the series winner and the total number of games, so it adds options beyond a single Game 1 position. Learn more about how to bet on Kalshi if this is your first time trading event contracts.
| Kalshi Promo Code | Kalshi Sign-Up Bonus | Kalshi States Available |
|---|---|---|
| ACTION55 | Trade $25, Get $55! | AK, AL, AR, CA, CO, CT, DC, DE, FL, GA, HI, IA, ID, IN, KS, KY, LA, ME, MN, MO, MS, NC, ND, NE, NH, NJ, NM, NY, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WI, WV, WY |
3. Novig
The Novig promo code ACTION gives eligible new users $50 in Trade Credits after a $10 deposit is completed. Novig runs as an exchange, so prices move with trading activity. The platform publishes a full Game 1 board, so download the app now to check current prices and enter a position trading the outcome, totals market, player props, and moe.
| Novig Promo Code | Novig Sign-Up Bonus | Novig States Available |
|---|---|---|
| ACTION | Deposit $10, Get $50 in Trade Credits! | AK, AR, FL, GA, HI, IL, IN, IA, KS, KY, ME, MA, MN, MO, NE, NH, NC, ND, OH, OK, OR, SC, SD, TX, VT, VA, DC, WI, WY |
4. ProphetX
The ProphetX promo code TANBONUS gives eligible new users a $75 bonus after $50 in qualifying trades are submitted. Get $25 today, $25 on day seven from when you sign up, and $25 on day 14. ProphetX operates as a peer to peer sports exchange, so orders match against other participants rather than a house. The platform covers a wide footprint, including California, Maryland, Wisconsin and Florida.
| ProphetX Promo Code | ProphetX Sign-Up Bonus | ProphetX States Available |
|---|---|---|
| TANBONUS | Trade $50, Get $75! | AL, AK, AZ, AR, CA, CO, CT, DE, FL, GA, HI, ID, IL, IN, IA, KS, KY, LA, ME, MD, MA, MI, MN, MS, MO, MT, NE, NH, NJ, NM, NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WV, WI, WY |
5. FanDuel Predicts
The FanDuel Predicts promo code is redeemable just by tapping our verified link. New users who trade at least $1 a day for five straight days earn $100 in promotional funds. Today's Game 1 works as day one, and the remaining World Series games fill out the other four days. Wisconsin is not on the state list below, but Florida is, which opens the door for Rays fans to trade.
| FanDuel Predicts Promo Code | FanDuel Predicts Sign-Up Bonus | FanDuel Predicts States Available |
|---|---|---|
| Click Here | Get $100 in Bonus When You Trade $1 for 5 Days! | AK, AL, CA, DE, FL, GA, HI, ID, MN, ND, NE, NM, OK, RI, SC, SD, TX, UT |
