MLB Prediction Market Promos: Trade on Brewers vs. Cubs, Any Game (Sep. 1)

Check out six of the best MLB prediction market apps' welcome offers for Tuesday's card, and a trader who works through every one of them can stack several hundred dollars in combined bonuses before Milwaukee and Chicago even take the field at Wrigley.

There are 15 games on the board Tuesday, starting with a 6:40 p.m. ET cluster and running late into the night with Yankees vs. Angels and Cardinals vs. Dodgers. The nationally televised game is Brewers vs. Cubs at 7:40 p.m. ET on TBS, game two of a four-game set at Wrigley Field between the two best teams in the National League Central.

None of the offers below ask much of you. Register, fund the account, place one qualifying MLB trade, and the credit lands in time for first pitch. Here is how the best MLB prediction market promos stack up for September 1.

Best MLB Prediction Market Promos

Brewers vs. Cubs Prices with Prediction Markets

Prediction market prices move differently than sportsbook odds. Contracts are quoted in cents, from 1¢ to 99¢, and the number you see is roughly the market's read on how likely that outcome is. A 47¢ contract pays out $1 if it hits, so you are risking 47 cents to make 53. Those prices shift all day as traders buy and sell, so always confirm the number in your app before you commit.

Brewers vs. Cubs | 7:40 p.m. ET | TBS | Wrigley Field

Milwaukee is a small underdog on the moneyline for just the second time in this series, and the 10.5 total is unusually high for a Wrigley game in September. We have been delving deep into these MLB markets all day and have found an angle for prediction market fans tonight.

Brewers vs. Cubs Expert Pick: Brewers +1.5 (63¢)

The Brewers have not lost by double digits in any other game against the Cubs this season, and their defense has been elite all year. The blowout last night, Cubs 17-3 Brewers, was an outlier and should not be read too much into; in fact, it shifts the market handily towards us.

Milwaukee has been one of the more consistent run-line teams in the league, sitting a few games above .500 against the number for the season and covering in nine of their last 14 games entering this series.

That is exactly the profile you want when you are buying the +1.5. You are not asking Milwaukee to win. You are asking them to stay within one run, which a team with a 3.37 team ERA and the third-best bullpen in baseball does at a high clip.

Five of seven meetings also finished under 10.5, four of them at eight runs or fewer, which means Tuesday's total is being propped up by a single 20-run night. There's a decent case for the under at 52¢ if you want a second play.

Best MLB Prediction Market Promos for Tuesday, September 1

You have plenty of options here. Work through them based on what matters most to you: bonus size, how much you need to put up front, and whether the platform is live in your state. Details on each welcome offer are below.

1. Polymarket Promo Code

Nothing on this list gets you moving faster than the Polymarket promo code ACTION. Deposit $10 and Polymarket returns $50 in bonus funds, massively bolstering your starting balance before you place a single trade.

For MLB traders specifically, that $50 gives you real flexibility across a 15-game Tuesday. You are not forced to dump it all on Brewers vs. Cubs. Spread it across three or four games, take a shot on a player prop as September milestone chases heat up, and let the bankroll work across the full slate.

• Polymarket Promo Code:ACTION
• Referral Bonus: Deposit $10, Get $50 in Bonus Funds.
• States Available: 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. FanDuel Predicts Promo Code

Two things work in your favor immediately: there is no waiting period on the welcome offer, and you do not need to enter a FanDuel Predicts promo code to claim it. Register, get verified, and the offer unlocks.

FanDuel Predicts runs in roughly 18 states, most of which do not have legal sportsbooks, including Texas, Florida, California, and Georgia. For a large share of Tuesday's TBS audience, this is the most accessible option on the page.

• FanDuel Promo Code:None required – click through to activate
• Sign-Up Bonus: Sign Up & Unlock Your Offer
• Key Feature: Early cash-out on live MLB positions
• States Available: AK, AL, CA, DE, FL, GA, HI, ID, MN, ND, NE, NM, OK, RI, SC, SD, TX, UT

3. Kalshi Promo Code

For anyone trading in the middle of the range, the Kalshi promo code ACTION delivers a straightforward trade-and-get: place $25 in qualifying trades and collect a $25 bonus.

Kalshi is the longest-tenured CFTC-regulated exchange in the United States, and it shows in the depth of the menu. Beyond game winners, run lines, and totals, Kalshi carries the widest prop and futures selection of any platform here – World Series markets, division winners, MVP and Cy Young races, and player milestone contracts.

That breadth is particularly valuable in September, when the futures board is at its most active, and prices move daily on the back of games like this one. Jacob Misiorowski's NL Cy Young contract is a live market right now, and Kalshi is where you will find it priced.

• Kalshi Promo Code:ACTION
• Sign-Up Bonus: Trade $25, Get $25 Bonus.
• Key Feature: Longest-running CFTC exchange, live in 41 states plus Washington, D.C.
• States Available: 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

4. Novig Promo Code

No deposit on this page works harder than the one behind the Novig promo code ACTION. Ten dollars in returns, $25 in trading credits, enough to cover several games on a 15-game Tuesday instead of putting everything on one side.

Novig is built peer-to-peer with a no-vig pricing model, meaning the platform does not take a cut when your trade wins. Over a 162-game season, that difference compounds in a way that is easy to underestimate. Baseball traders place more volume than fans of any other sport simply because there are more games, and every point of margin you are not paying stays in your account.

For the Brewers vs. Cubs, Novig has one advantage in that it is live in both Illinois and Wisconsin's neighboring markets, covering a large share of the two fan bases most invested in Tuesday night.

• Novig Promo Code:ACTION
• Sign-Up Bonus: Deposit $10, Get $25 in Trading Credits.
• Key Feature: Peer-to-peer, no commission on winning trades, uncapped trade size
• States Available: AK, AR, DC, FL, GA, HI, IA, IL, IN, KS, KY, MA, ME, MN, MO, NC, ND, NE, NH, OH, OK, OR, SC, SD, TX, VA, VT, WI, WY

5. DraftKings Predictions Promo Code

The loudest number on the page belongs to the DraftKings Predictions promo code: trade $5 and get $150 in Predictions Dollars back. DraftKings Predictions is one of the newest products in the category, and it has been built to feel familiar to anyone who has used the DraftKings sportsbook.

Contract prices sit alongside the odds formats regulars already read fluently, the navigation mirrors the main app, and the whole thing is designed to make the jump from betting to trading feel like changing tabs rather than learning a new discipline. The interface is genuinely one of the best in the space.

With $150 in play off a $5 qualifying trade, a new trader can spend the last month of the regular season learning how these markets behave without risking real money. That is a much better education than reading about it, and the bonus size makes it affordable.

• DraftKings Predictions Promo Code:None required – click through to activate.
• Sign-Up Bonus: Trade $5, Get $150 in Predictions Dollars.
• Key Feature: One of the broadest state footprints in the category
• States Available: AK, AL, AR, AZ, CA, CO, CT, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, MD, MI, MN, MO, MS, MT, NC, ND, NE, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WI, WV, WY

6. ProphetX Promo Code

The ProphetX promo code TANBONUS keeps the math simple. Place $10 in trades, get $20 back in bonus funds. ProphetX is the only platform on this list that does sports and nothing else. There are no political markets, no economic indicators, no crypto contracts cluttering the interface. You open the app, and you see games.

For a baseball trader working a 15-game slate, that focus is a real practical advantage – less scrolling, faster navigation, and a markets page that is organized around the sport you actually came for.

• ProphetX Promo Code:TANBONUS
• Welcome Offer: Trade $10, Get $20 Bonus.
• Key Feature: Sports-only exchange with instant cash-out
• States Available: AK, AL, AR, AZ, CA, CO, CT, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WI, WV, WY

Sep. 1, 2026 – Tuesday’s MLB Slate