Six of the best MLB prediction market platforms are running new-user offers for games this Sunday, and a trader who works through all of them will clear hundreds of dollars in combined bonuses before it all gets started.
A full 15-game slate awaits today, as every MLB team will be in action. It all gets started with the Marlins vs. Nationals at 12:15 p.m. ET (Peacock), followed by the Astros vs. Mets at 3:15 p.m. ET (NBC), and the Reds vs. Cubs at 7:20 p.m. ET (NBC) to close it out on Sunday Night Baseball.
None of the offers below ask much of you. Register, fund the account, put down one qualifying MLB trade, and the credit is sitting there in time for Reds vs. Cubs or anything else on the Sunday card. Here is how the best MLB prediction market promos stack up for August 30.
| MLB Prediction Markets | MLB Prediction Market Promos | Sign-Up Link |
|---|---|---|
| Polymarket | Deposit $10, Get $20 Trading Bonus | ACTION |
| FanDuel Predicts | Sign Up & Unlock Your Offer | Click Here |
| Kalshi | Trade $25, Get $25 Bonus | ACTION |
| Novig | Deposit $10, Get $25 in Trade Credits | ACTION |
| DraftKings Predictions | Trade $5, Get $200 in Predictions Dollars | Click Here |
| ProphetX | Trade $10, Get $20 Bonus | TANBONUS |
Best MLB Prediction Market Promos for Sunday, August 30
You'll have plenty of options to choose from with this list of the best MLB prediction market promos on the diamond. See which ones work best for you, whether that means bonus size, initial deposit, or if it's even available in your state. Below, you will find the details on each welcome offer to help get you on the basepaths.
1. Polymarket
Nothing on this list gets you in the door faster than the Polymarket promo code ACTION. Make a deposit of $10, and Polymarket returns $20 in bonus funds — double your money before you place a single trade.
Polymarket has plenty of markets on each game, including MLB player props, which can be valuable as we come down the stretch run of the 2026 season. With certain players trying to reach milestones, you can use that to your advantage at one of the best prediction market apps.
| Polymarket Promo Code | Polymarket Referral Bonus | Polymarket States Available |
|---|---|---|
| Polymarket Promo Code ACTION | Deposit $10, Get $20 in Bonus Funds | 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
Two benefits right off the bat: there is no waiting period for the welcome offer, and you don't need to enter the FanDuel Predicts promo code to claim it. Your welcome offer opens up as soon as you register and the account is live.
Because the layout borrows from the sportsbook app that millions of people already navigate without thinking, FanDuel Predicts ranks among the best prediction market apps for a first-time contract trader. It runs in 18 states, Texas, Florida, California, and Georgia included, so a big share of the Sunday night audience is eligible.
| 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 |
3. Kalshi
For anyone trading in the middle of the range, the Kalshi promo code ACTION offers a solid "bet-and-get" offer of claiming a $25 bonus after making $25 worth of trades.
Kalshi operates under CFTC regulation and operates in 41 states plus Washington, D.C. Its offerings span every market, including MLB futures on the World Series and the MLB MVP race, and the spreads hold up even as a one-run game reaches the ninth.
| Kalshi Promo Code | Kalshi Sign-Up Bonus | Kalshi States Available |
|---|---|---|
| Kalshi Promo Code ACTION | Trade $25, Get $25 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 |
4. Novig
No deposit on this page works harder than the one behind the Novig promo code ACTION. Ten dollars in returns $25 in trade credits, which is enough to spread across a few different games on the Sunday slate rather than sinking it all into one side.
Novig is built peer-to-peer and charges no commission when a trade wins, so the profit stays where you earned it. That setup sets it apart from most MLB prediction market apps and favors anyone putting up real volume. It is also one of the few platforms on this list live in both Illinois and Ohio, which covers the two fan bases watching tonight most closely.
| Novig Promo Code | Novig Sign-Up Bonus | Novig States Available |
|---|---|---|
| Novig Promo Code ACTION | Deposit $10, Get $25 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 |
5. DraftKings Predictions
The loudest number on the page belongs to the DraftKings Predictions promo code: Trade $5 and $200 in Predictions Dollars come back.
In 47 states, DraftKings Predictions has one of the broadest reaches of any MLB prediction market app. Contract prices sit next to the MLB odds formats regulars already know, so anyone arriving from the sportsbook side can understand this all well without a tutorial.
| DraftKings Predictions Promo Code | DraftKings Predictions Sign-Up Bonus | DraftKings Predictions States Available |
|---|---|---|
| DraftKings Predictions Promo Code (Click Here) | Trade $5, Get $200 in Predictions Dollars | AL, AK, AZ, AR, CA, CO, CT, DE, FL, GA, HI, ID, IL, IN, IA, KS, KY, LA, MD, MA, MI, MN, MS, MO, MT, NE, NV, NJ, NM, NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WV, WI, WY |
6. ProphetX
The ProphetX promo code TANBONUS keeps the math simple: make $10 worth of trades, get $20 in bonus back in return.
ProphetX is available in all but two U.S. states, and it's a platform where users set the prices, earning it a place among the best prediction market promos for traders who would rather quote a number than take the one on the screen. Layer it on top of the other MLB prediction market promos above, then follow every new offer and every MLB market at Action Network.
| 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, NH, NJ, NM, NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WV, WI, WY |
