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Kalshi Promo Code SIBONUS: Get up to $500 Bonus for MLB & WNBA Trading on Wednesday

Jeff Watters|
Claim the Kalshi promo code SIBONUS for up to $500 trading bonus on MLB and WNBA games Wednesday, August 12. New users only.
Claim the Kalshi promo code SIBONUS for up to $500 trading bonus on MLB and WNBA games Wednesday, August 12. New users only. | Sports Illustrated

Wednesday, August 12 brings a loaded slate of MLB and WNBA action, and it's the perfect time to explore prediction market promos on Kalshi. The Kalshi promo code SIBONUS unlocks up to $500 trading bonus for new users, and you can put those funds toward trading outcomes on marquee matchups like Mariners-Yankees, Mets-Braves, and Royals-Dodgers. The code is required to claim this offer, and you'll need to complete at least $25 in trades within seven days of registration to unlock your bonus.

How the Kalshi Promo Code Works for Wednesday's MLB and WNBA Slate

The Kalshi promo code SIBONUS gives new traders a substantial welcome offer to explore real-world event contracts. You must deposit at least $10 and complete $25 in settled trades to qualify for your bonus, which can reach up to $500 depending on Kalshi's discretion. The bonus amount is random, though only a small percentage of new users receive the maximum $500 award.

Here are the key terms you need to know before claiming your bonus:

  • You must be 18 years or older and a new Kalshi user to qualify.
  • Enter promo code SIBONUS during registration to activate the offer.
  • Complete identity verification with a government-issued ID and selfie through KYC.
  • Deposit at least $10 and trade at least $25 in settled contracts within seven days of signing up.
  • Your bonus credit is awarded regardless of whether your trades win or lose.
  • Any bonus credit must be used within seven days of being granted or it expires.

Let's say you trade $25 on the Mariners-Yankees outcome on Wednesday. If the Mariners win and your contract settles in your favor, you pocket those winnings plus your bonus. If the Yankees win instead, your trade settles at a loss, but you still receive your bonus credit to use on other markets like the Mets-Braves or Sky-Valkyries matchup.

The bonus itself is separate from your trading results. Kalshi credits your account with the bonus amount after you meet the $25 trade requirement, giving you additional funds to explore other prediction markets beyond Wednesday's slate. You have seven days to deploy that bonus credit before it expires.

Claiming the Kalshi Promo Code SIBONUS for Wednesday's Games

Signing up and claiming your bonus takes just a few minutes. Follow these steps to start trading on Wednesday's MLB and WNBA action:

  1. Create your account: Visit Kalshi's sign-up page and enter the promo code SIBONUS during registration. Provide your email, mobile number, Social Security Number, and residential address.
  2. Verify your identity: Submit a government-issued ID and selfie to complete Kalshi's Know Your Customer verification process. This is standard for regulated trading platforms.
  3. Fund your account: Add at least $10 using a supported payment method like debit card or PayPal. Deposit enough to cover your $25 trade requirement.
  4. Place your first trade: Navigate to Wednesday's slate and select a market like Mariners-Yankees or Royals-Dodgers. Execute a $25 trade on your chosen outcome.
  5. Receive your bonus: Once your trade settles, Kalshi credits your bonus to your account. Use it on any available prediction market within seven days.

The entire process mirrors standard financial platform onboarding. You'll have full access to Kalshi's marketplace of real-world event contracts across sports, politics, culture, and more once your account is verified and funded. Want to learn more about how Kalshi compares to other prediction markets? Read our Kalshi vs. Polymarket review for a detailed breakdown.

Trading is risky, always trade responsibly. If your activity is becoming a problem, support is available by calling 1-800-522-4700.

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Jeff Watters
JEFF WATTERS

An award-winning author at just six years old (it’s true!), Jeff has parlayed early-life accolades into a prominent role in the sports betting content space with Sports Illustrated. As content manager, he leads a talented team of expert betting analysts and sportsbook reviewers focused on delivering industry-best experiences to North American bettors. Jeff joined SI in 2024 and has since been a driving force in enhancing the team’s sports betting coverage. With his inventive mindset and relentless pursuit of "best-in-class" content, Jeff ensures SI readers have access to unparalleled betting analysis that’s comprehensive, unbiased, and well-researched. Jeff’s primary goal is to give new and casual bettors the confidence they need to come to their own conclusions when deciding how and where to bet online. Before joining the SI team, Jeff was a senior editor at Covers, where he laid much of the groundwork for the brand’s commercial sports betting content strategy. Known for his industry knowledge and product expertise, Jeff has been a leading voice with his coverage of burgeoning legal sports betting markets like New York, Ohio, and Ontario. An avid bettor himself, Jeff is a strong proponent of line shopping and sticking with a consistent, manageable unit size. He primarily wagers on MLB, NFL, and NHL player props and cites bet365, Pinnacle, and Sports Interaction as his most-used sportsbooks. Jeff holds a BBA from St. Francis Xavier University. His work has been featured in Newsweek and referenced in news media outlets like the Calgary Herald, Financial Post, and Toronto Sun. The Nova Scotia native has crafted and edited over 400 articles and guides across the sports, iGaming, e-learning, and software industries since 2020.

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