MLB Prediction Market Apps: Get Best Sign Up Promos This Weekend originally appeared on The Sporting News. Add The Sporting News as a Preferred Source by clicking here.If you're looking to elevate your betting strategy and explore the best MLB prediction market apps, there are some serious welcome bonuses to collect right now. We're starting with the Kalshi promo code TSN15. By jumping on this, new customers can get up to a $500 bonus.Whether you are zeroing in on todays specific slatelike that massive Atlanta Braves vs. New York Yankees clashor looking ahead to any MLB games later this weekend, this is your ticket to a nice pay day. We're in this together, so let's break down exactly how you can put these prediction markets to work and build your bankroll.MLB Prediction Apps and Promo CodesIf you want to get the most value out of your wagers, it pays to shop around. Here is a quick look at the best welcome offers available across the top platforms:Prediction AppPromo CodeNew User OfferKalshiTSN15Trade $25, Get Up to $500 BonusPolymarketTSNTrade $10, Get a $20 BonusNovigTSNEWSTrade $10, Get a $25 BonusProphetXTSNEWSTrade $10, Get a $20 BonusOG.comUse Link (Here)Trade $10, Get a $10 BonusDiving Into the Kalshi Promo CodeFor new Kalshi customers who are 18 or older and present in the US, this welcome offer is a fantastic entry point. To claim the bonus, new users simply need to register here and make a first-time deposit. Then, complete $25 in trades to release the bonus.70% of participants receive a $15 trading bonus24% of participants receive a $35 trading bonus5% of participants receive a $75 trading bonus0.65% of participants receive a $100 trading bonus0.35% of participants receive a $500 trading bonusMore Bonuses from Top MLB Prediction Market AppsWhy stop at just one platform? If we're truly maximizing our edge across the top MLB prediction market apps, you should take advantage of the rest of the field.You can use the Polymarket promo code TSN to secure a $20 bonus after trading $10. Over at Novig and ProphetX, punch in the promo code TSNEWS to grab a $25 bonus and a $20 bonus, respectively, just for making that same $10 trade. Finally, OG.com is handing out a straightforward $10 bonus when you trade $10. Stacking these offers gives us the leverage we need to chase bigger payouts with confidence.MLB Games on Saturday and ProbabilitiesWhen we look at the board, finding the right spots to place your trades is all about understanding the numbers. Here are today's moneylines:MatchupMoneylineProbabilityATL @ NYYATL -134 / NYY +112ATL 54.8% / NYY 45.2%TOR @ PHITOR +132 / PHI -158TOR 41.3% / PHI 58.7%NYM @ PITNYM +118 / PIT -141NYM 43.9% / PIT 56.1%HOU @ SDHOU +102 / SD -121HOU 47.5% / SD 52.5%LAD @ ARILAD -173 / ARI +144LAD 60.7% / ARI 39.3%Here is exactly how I look at these payouts: If you use your $10 Kalshi sign-up bonus on the heaviest favorite on the boardthe Los Angeles Dodgers (-173)a winning trade yields a steady profit of $5.78. Conversely, if you want to take a swing on the heaviest underdog, a successful $10 prediction on the Arizona Diamondbacks (+144) returns a very healthy $14.40 in profit.To find the best value, let's break down the marquee matchup between the Braves and Yankees. New York holds a slight edge on the mound, boasting a 3.334 team ERA compared to Atlanta's 3.627 ERA. However, the Braves offset that pitching gap with pure firepower at the plate. Atlanta is swinging a .250 team batting average and a .737 OPS, easily outpacing New York's .231 average and .722 OPS. That offensive superiority is exactly why the math favors the Braves as the -134 road favorite.