With Sunday’s MLB slate giving baseball traders three nationally televised games spread across three separate windows, starting at lunchtime and running until nearly midnight ET. Get set up with our MLB prediction market promos, with up to $700 in bonuses up for grabs.
Today's play starts off with the Orioles vs Rays at 12:15 p.m. ET on Peacock and NBC. The Cardinals vs Cubs renews the MLB's oldest rivalry at 3:15 p.m. ET on ABC from Wrigley Field.
And the AL West decides a little more of itself with the Mariners vs Astros who close the night at 7:20 p.m. ET on NBC and Peacock from Daikin Park.
Best MLB Prediction Market Promos for Sunday's Slate
| MLB Prediction Markets | MLB Prediction Market Promos | Sign-Up Link |
|---|---|---|
| Polymarket | Deposit $10, Get $20 Bonus | Code: ACTION |
| FanDuel Predicts | Make Any Trade, Get $25 Bonus | Auto-Applied via Link |
| Kalshi | Trade $25, Get Up to $500 Bonus | Code: ACTION |
| Novig | Deposit $10, Get $25 Trading Credits | Code: ACTION |
| DraftKings Predictions | Trade $5, Get $150 in Predictions Dollars — No code needed | Auto-Applied via Link |
| ProphetX | Trade $10, Get $20 Bonus | Code: TANBONUS |
Sunday MLB Odds for Sunday's Key Games
MLB markets with Prediction platforms contracts are priced in cents, not American odds, a trade at 58¢ implies a 58% chance of that outcome hitting, and settles at $1.00 if it does. Prices rely on you and other traders' positions, you help decide the market, without the sportsbook or ‘house’ getting involved.
Orioles vs. Rays — 12:15 p.m. ET, Tropicana Field
- Moneyline: Orioles – $0.40 (Underdog) / Rays – $0.63 (Favorite)
Cardinals vs. Cubs — 3:15 p.m. ET, Wrigley Field
- Moneyline: Cardinals – $0.41 (Underdog) / Cubs – $0.61 (Favorite)
Mariners vs. Astros — 7:20 p.m. ET, Daikin Park
- Moneyline: Mariners – $0.48 (Underdog) / Astros – $0.56 (Favorite)
Disclaimer: Contract availability, and price vary by platform — always confirm the live price and the market's official rules in-app before trading.
Prediction Market Promos for Sunday’s MLB Action
The six platforms below all carry Sunday's slate. Here's what each does best and why their MLB prediction market promo might suit you.
1. Polymarket Promo Code ACTION
This is the simplest and easiest way onto Sunday's slate. A $10 deposit, no trade needed, is unique, costing you nothing to get set up with $20 in trading credit. Plenty enough to take a position in all three of Sunday's windows and still have something left for Monday. Deposit before the 12:15 p.m. ET Orioles-Rays and the bonuses will be yours before the first pitch.
Polymarket also resolves contracts against official MLB data via its Sportradar partnership — worth having on a Sunday nighter in Houston that won't settle until after 11 p.m. ET.
Polymarket Promo Code Offer: Deposit $10, get a $20 trading bonus with code ACTION— a 200% match and the lowest barrier to entry on this list.
2. FanDuel Predicts Promo Code
FanDuel Predicts is the softest landing for anyone coming from a traditional sportsbook, because it barely looks like an exchange at all — the UI is FanDuel's sportsbook layout adapted to contracts, so Mariners-Astros presents exactly the way a bettor expects. It's backed by CME Group, and its early cash-out tooling is the most polished in the category for in-game exits during a four-hour Sunday night game.
FanDuel Predicts Promo Code Offer: Sign Up & Unlock Your Offer. Auto-Applied via Link
3. Kalshi Promo Code ACTION
The biggest bonus of any prediction market is on offer with Kalshi, one built for a full week of baseball rather than a single Sunday. A simple $25 in trades returns a bonus somewhere up to $500, so treat the top number as the ceiling, not the expectation.
IT does have the biggest entry point but Kalshi is where to go if you’re looking for a chance to score some major bonuses. Beyond Sunday's three game-winner markets, the prop and futures menu is the widest in the category.
Kalshi Promo Code Offer: Trade $25, Get up to $500 in bonuses with code ACTION.
4. Novig Promo Code ACTION
A $25 trade is all that is needed to unlock $50 Novig coins, but the reason it suits baseball is what happens after the credit lands.
Novig runs no-vig peer-to-peer pricing, a perfect fit for a league playing 15 games a night. If the next seven days mean a series of small daily positions rather than one Sunday swing, that pricing edge you can get with Novig only add to the $50 bonuses on offer.
Novig Promo Code Offer: Spend $25, Get $50 in Novig Coins with code ACTION.
5. DraftKings Predictions Promo Code
The best ratio on the page by a distance: a $5 qualifying trade returns $150, 30x the amount you actually put at risk. One small position on Sunday's lunchtime Orioles-Rays game unlocks enough to cover every national TV window left in August.
$150 inside a single Sunday slate might be overkill but with MLB action every day it could be anywhere from a few days to a week and a half of funded trading.
DraftKings Predictions Promo Code Offer: Trade $5 Get $150 in Predictions Dollars. Auto-Applied via Link
6. ProphetX Promo Code TANBONUS
A $10 trade doubles into $20, and on a day with three national windows that's two funded positions off one qualifying trade. Use the 12:15 p.m. ET Rays game to place your $10 and get set up with bonuses for the afternoon matchup and then Sunday Night Baseball.
The sports-only nature of ProphetX comes up clutch on stretches like this. No election or crypto markets competing for space means that through a six-day baseball week the app opens on baseball and stays there. Perfect when you're hunting a specific run-line market between innings.
ProphetX Promo Code Offer: Trade $10 and get a $20 bonus with code TANBONUS.
Prediction Markets and MLB
Prediction markets aren't sportsbooks. They're CFTC-regulated exchanges where you buy and sell event contracts. Trade on"yes/no" positions on a real-world outcome. Instead of taking a price from the house or sports betting site, you're matched against other traders.
For baseball, that means the same markets are on offer, just looking a touch different expressed differently: game-winner contracts (the moneyline equivalent), run-line contracts, total-runs contracts, an expanding menu of player props like strikeouts, hits and home runs, and season-long futures on division winners, pennants and the World Series.
