Put a $25 trade bonus in your account by signing up with the Kalshi US Open promo codeACTION on the final day of the opening round in this tournament. Register now, trade $25 on any tennis event contracts that speak to you, and be credited with $25.
I redeemed the Kalshi promo codeACTION from Action Network myself, and the steps between entering my information and placing my first trade went swiftly. Read on for more information, as well as my breakdown of how to trade US Open contracts.
Kalshi US Open Promo Code ACTION Overview
| Detail | Terms |
|---|---|
| Kalshi promo code | ACTION |
| Offer | Trade $25, get $25 |
| Minimum deposit | $1 |
| Bonus type | Trading credit, not withdrawable |
| Age | 18+ |
| Regulator | CFTC |
How to Claim Kalshi Promo Code ACTION
- Tap any link on this page to begin the registration flow.
- Insert the Kalshi US Open promo code ACTION when asked for one.
- Verify your identity with a photo ID, a selfie, and your Social Security number.
- Deposit at least $1 using debit, Apple Pay, PayPal, Venmo, or bank transfer.
- Trade $25 on Kalshi predictions. Volume satisfies the criteria, not results.
- Collect the $25 credit and spend it on US Open prediction markets, NFL futures markets, and more.
One piece of advice I have is to remember to enter Kalshi US Open code ACTION during sign-up, not after. You miss out on the bonus if you forget this step.
Gauff vs. Sönmez Odds on Kalshi and Polymarket
Both prediction markets price Gauff vs. Sönmez as YES and NO contracts between 1 cent and 99 cents, meaning the price you see also functions as the implied probability. Neither one bakes a vig into a posted line.
| Factor | Kalshi | Polymarket US |
|---|---|---|
| Gauff YES price | 93¢ | 94¢ |
| Sönmez YES price | 8¢ | 7¢ |
| Taker fee coefficient | 0.07 | 0.06 |
| Tenis order book depth | Deeper | Thinner |
| Maker rebates | No | Yes |
Kalshi provides the tighter spreads on mainstream Grand Slam markets. I priced both boards on Sunday when Jessica Pegula opened the tournament on Ashe against Elena-Gabriela Ruse and paid less at Kalshi than on Polymarket.
When you include the Kalshi US Open promo code ACTION bonus, Kalshi is my pick for the platform to trade Gauff-Sönmez odds on today, Tuesday, Sept. 1, 2026.
Gauff vs. Sönmez Pick: Gauff to Win YES
Gauff owns three edges here that lend me to backing her winning odds tonight:
- Home court. As a top-four seed and the biggest home draw in the women's field, Gauff gets scheduled on Arthur Ashe for almost every match, and a first-round night session there is about as friendly an environment as tennis offers an American.
- Form. Gauff arrives hotter than anyone in the draw. She beat Pegula 6-2, 6-4 for a second Cincinnati title on the same surface eight days ago.
- Big-stage pedigree. Gauff won this tournament in 2023 at nineteen, coming from a set down against Aryna Sabalenka in the final, and she has since added Roland Garros. Sönmez has no comparable Flushing Meadows résumé to lean on.
I respect a first-round opponent with nothing to lose on a fast court, but I side with the champion in front of her own crowd. If our reads land for you, sign up now with the Kalshi US Open promo code ACTION and put the bonus to work this evening on Gauff-Sönmez.
Why Grand Slam Tennis Suits the Kalshi US Open Promo Code ACTION
- Kalshi allows you to sell positions between sets instead of sweating a fifth-set tiebreak.
- Trade match winners, US Open champion odds, tournament futures, and more.
- Watch peers and their real money set the prices you trade rather than a bookmaker.
Register with the Kalshi promo code ACTION today, complete $25 in trades, and collect $25 before first serve today.
