Cubs vs. Cardinals headlines tonight's NL Central slate at Busch Stadium (7:45 p.m. ET on TBS), and the sharpest MLB prediction market promos drop real bonus credit into your account before the first pitch. Grab welcome offers as a new trader on Kalshi, Polymarket, FanDuel Predicts, Novig, and ProphetX.
This guide ranks the top MLB prediction market promos for tonight's game, breaks down each offer step by step, and points you toward the exact markets that fit the Cubs vs. Cardinals matchup on the top MLB prediction market apps.
| MLB Prediction Markets | MLB Prediction Market Promos | Sign-Up Link |
|---|---|---|
| Polymarket | Deposit $10, Get $20 in Bonus Funds | ACTION |
| FanDuel Predicts | Sign Up & Unlock Your Offer | Click Here |
| Kalshi | Trade $25, Get Up to $500 Bonus | ACTION |
| Novig | Spend $25, Get $50 in Novig Coins | ACTION |
| ProphetX | Trade $10, Get $20 Bonus | TANBONUS |
Ranking Top Cubs vs. Cardinals MLB Prediction Market Promos
I've redeemed each of the MLB prediction market promos below to verify their legitimacy. Here is how I rank the top five MLB prediction market apps before the Cubs and Cardinals renew their divisional rivalry.
Polymarket: $20 Bonus for New Traders
Our Action Network Polymarket promo code ACTION runs one of the most straightforward MLB prediction market promos available right now. Deposit $10 on the app, and Polymarket hands you a flat $20 trading bonus.
Polymarket operates under CFTC oversight and lists deep sports markets alongside politics, economics, and more. The flat structure removes the guesswork: every eligible new trader unlocks the same $20, making it a clean entry point for a Cubs–Cardinals contract.
Claim it in three moves:
- Download the Polymarket US app and open a new account
- Deposit $10 or more
- Watch the $20 bonus post to your balance
| Polymarket Promo Code | Polymarket Referral Bonus | Polymarket States Available |
|---|---|---|
| Polymarket Promo Code ACTION | Deposit $10, Get $20 in Bonus Funds | AL, AK, AR, CA, CO, CT, DE, FL, GA, HI, ID, IN, IA, KS, KY, LA, ME, MN, MS, MO, NE, NH, NM, NJ, NY, NC, ND, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY, DC |
FanDuel Predicts: Receive Your Bonus
The FanDuel Predicts promo code keeps its offer simple among the major MLB prediction market apps. Open a new account, deposit at least $10, and receive a random bonus amount as a new user to trade with on MLB picks.
FanDuel Predicts shows odds as multipliers rather than implied probability, which reads a lot like a traditional sportsbook. Sports fans making the jump from betting to trading tend to feel right at home on this app.
Steps to grab the Polymarket bonus:
- Sign up on the FanDuel Predicts app (no promo code necessary)
- Deposit $10 or more
- Receive a random bonus amount
| FanDuel Predicts Promo Code | FanDuel Predicts Sign-Up Bonus | FanDuel Predicts States Available |
|---|---|---|
| FanDuel Predicts Promo Code (Click Here) | Sign Up & Unlock Your Offer | AK, AL, CA, DE, FL, GA, HI, ID, MN, ND, NE, NM, OK, RI, SC, SD, TX, UT |
Kalshi: Up to $500 for Cubs vs. Cardinals
Kalshi is one of the most recognizable names on this list of MLB prediction market promos and offers the biggest ceiling of any offer. Deposit at least $10 after redeeming the Kalshi promo code ACTION, complete $25 in qualifying trades, and unlock a randomized bonus that reaches up to $500 in trading credit.
The CFTC regulates Kalshi as an event-contract exchange, so contract prices move like live odds. Buy "Yes" on the Cubs to win at Busch Stadium, and the position settles at $1 if Chicago closes it out, or $0 if St. Louis flips the script.
How to claim the Kalshi bonus:
- Register a new Kalshi account and enter code ACTION during sign-up
- Deposit $10 or more and trade $25 across prediction markets
- Collect the randomized bonus in your account, then trade it on tonight's game
| Kalshi Promo Code | Kalshi Sign-Up Bonus | Kalshi States Available |
|---|---|---|
| Kalshi Promo Code ACTION | Trade $25, Get Up to $500 Bonus | AL, AK, AR, CA, CO, CT, DE, FL, GA, HI, ID, IN, IA, KS, KY, LA, ME, MN, MS, MO, NE, NH, NM, NJ, NY, NC, ND, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY, DC |
Novig: Spend $25, Get $50 in Novig Coins
Novig brings a peer-to-peer twist to the group. Enter Novig promo code ACTION at sign-up, spend $25, and grab $50 in Novig Coins, which is a generous multiplier for such a small buy-in. Novig runs a sweepstakes model with two currencies: Novig Coins for free-to-play trading and Novig Cash, which redeems for real cash prizes.
The peer-to-peer engine sets Novig and MLB prediction market apps apart from standard sportsbooks. Rather than accept a fixed line, you set your own price on a Cubs vs. Cardinals prediction and wait for another trader to take the other side.
How to claim the Novig bonus:
- Download the Novig app and register a new account
- Enter the promo code at sign-up
- Spend $25 to activate $50 in Novig Coins
| Novig Promo Code | Novig Sign-Up Bonus | Novig States Available |
|---|---|---|
| Novig Promo Code ACTION | Spend $25, Get $50 in Novig Coins | 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 |
ProphetX: Trade $10, Get $20 Bonus
The ProphetX promo code TANBONUS rounds out the lineup of MLB prediction market promos with a clean offer that suits sports diehards. Enter our certified code at sign-up, complete a $10 trade, and collect a $20 bonus. ProphetX reaches traders across 49 states for users 19 and up.
The peer-to-peer exchange model strips the vig down to a small transaction fee on winnings. ProphetX also stands out for its Request for Quote system, which lets you build and price multi-event combinations (parlay-style trades) directly in the app. That flexibility fits a Cubs–Cardinals card full of moneyline, total, and player-prop MLB odds.
How to claim the ProphetX bonus:
- Sign up on the ProphetX app and enter promo code TANBONUS
- Deposit and complete one settled trade of at least $10
- Collect the $20 bonus credit in your account
| ProphetX Promo Code | ProphetX Welcome Offer | ProphetX States Available |
|---|---|---|
| ProphetX Promo Code TANBONUS | Trade $10, Get $20 Bonus | 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, NV, NH, NJ, NM, NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY |
Why Sign Up With MLB Prediction Market Apps?
Prediction markets flip the usual sportsbook model. Instead of a house setting the line, traders buy and sell shares on outcomes, and prices float with demand. The platforms above offering MLB prediction market promos list Cubs–Cardinals contracts that settle at $1 for a correct call and $0 for a miss.
Two groups gain the most from these offers. Sports fans in states without legal online sportsbooks (think California or Texas) trade real-money contracts on baseball through these platforms. Active traders, meanwhile, stack welcome bonuses across several MLB prediction market apps to spread bankroll and test each interface before committing.
