The Kalshi referral code ACTION gives new traders up to $500 in bonuses after a $25 trade, and Sunday night's Mariners vs. Astros finale hands you a national MLB stage to use it on. First pitch arrives at 7:20 p.m. ET on NBC from Daikin Park in Houston. Our Kalshi review covers the full platform.
Kalshi operates as a CFTC-regulated exchange, so you buy and sell event contracts priced in cents rather than taking a fixed ticket. Each contract settles at $1 when the outcome hits and $0 when it misses, so a Seattle contract at $0.55 shows a market leaning slightly toward the Mariners.
Enter the code at signup, fund the account, and trade $25 to unlock bonus credit for tonight's slate and every market after it.
Kalshi Referral Code ACTION at a Glance
These terms make it the best Mariners vs. Astros prediction market promo available this weekend.
| Feature | Details |
|---|---|
| New Trader Offer | Trade $25, get up to $500 in bonuses |
| Referral Code | ACTION |
| Minimum Trade | $25 |
| Minimum Age | 18+ (higher in some states) |
| Eligible States | 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 |
How to Claim the Kalshi Referral Code ACTION in 6 Steps
- Tap any claim link on this page and download the Kalshi app.
- Register with your name, address, and contact details.
- Enter the Kalshi promo code ACTION when the app asks for a referral.
- Complete identity verification.
- Deposit and trade $25 on any market, including Sunday's series finale.
- Collect up to $500 in bonuses.
New traders only, 18 and older, and you must be in an eligible state at signup. Prediction markets redraw the usual where is sports betting legal map, since federal oversight reaches further than sportsbooks by state licensing does, and this Kalshi referral code ACTION offer covers 41 states plus D.C.
Mariners vs. Astros Odds and Kalshi Market Prices
Houston sits at 63-61 and owns first place in the AL West after a 16-10 run since the All-Star break. Seattle shows up at 58-66, five games back after beating Houston 10-5 on Saturday behind 15 hits and seven strong innings from Emerson Hancock.
The head-to-head record flips those standings upside down. Seattle has taken eight of 10 meetings this season and 11 of the last 13 overall, including seven of the last nine at Daikin Park.
Mariners vs. Astros Prediction: Our Expert Pick on Kalshi
Bryan Woo (8-8, 4.15 ERA) starts for Seattle opposite Hunter Brown (3-2, 3.68 ERA), who holds opponents to a .201 average across 63.2 innings in an injury-shortened season. Woo carries 132 strikeouts against 28 walks in 132.1 innings, and that command travels well on the road.
Yordan Alvarez powers the Houston order at .321/.436/.622 and belongs in any MLB MVP conversation. Seattle counters with Randy Arozarena and Julio Rodríguez, though the bats have gone quiet at 3-7 over the last 10 games. Check MLB lineups late, since Sunday night cards often shift after a Saturday bullpen day.
Mariners vs. Astros Prediction: Under 7.5 Runs (49%): I'm going with Mariners/Astros Under 7.5, backing a pitcher's duel between Bryan Woo and Hunter Brown. Woo has been rolling with back-to-back scoreless outings and a 3.59 xERA, while Brown owns a 3.65 xERA and a 55.9% ground-ball rate, making him a strong candidate for a quality start against an underwhelming Mariners offense.
If you like our content and picks, claim the best Mariners vs. Astros prediction market promo with the Kalshi referral code ACTION and trade this one alongside us, then check our MLB picks and predictions today for the rest of the slate.
Why Kalshi Leads for Live MLB Trading
Prices move through all nine innings, so you exit a green position in the sixth or add after a two-out rally, which ranks it among the best prediction market apps for live MLB. That in-game control, plus contracts on division races and season awards, puts Kalshi at the front of MLB prediction market promos for anyone tracking the AL West.
Bottom Line on the Kalshi Bonus Offer
Sunday night gives you a division lead on the line, a sharp pitching matchup, and the best Mariners vs. Astros prediction market promo on the board. Sign up with the Kalshi referral code ACTION, trade $25, and take a position before 7:20 p.m. ET.
Certain limitations apply. The offer is available to new users only, subject to the terms and conditions at kalshi.com/tc/500. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information. Not available in AZ, IL, MA, MD, MI, MT, NV, OH, and WA.
