July 27, 2026
by Emma Harrison
The DC Open brings big names to Washington, DC on July 28, 2026, and top prediction markets are letting users claim complementary promo offers. As a trader, you can get more value with prediction market promos across three trusted platforms.
Kalshi, Polymarket, and Crypto.com all allow eligible US users to trade on outcomes throughout the DC Open. Each platform features a straightforward sign-up process alongside some interesting bonuses, though the requirements and bonus expiration window differ. In this guide, we’ll break down every offer and the requirements, comparing all three prediction market platforms side by side for the tournament.
Ahead of the upcoming Mubadala DC Open, Kalshi, Polymarket, and Crypto.com have some interesting bonuses for new players. All three operators rank among the best prediction market sites for major tennis events. Also, each platform has event contracts that cover match winners, set totals, and futures for the DC Open. For a glance at what each operator has on offer, see the table below. But note that the specific bonus amounts and terms can change, so confirm current figures in-app before depositing and trading.
| Operator | Offer | Minimum requirement |
| Kalshi | $15 up to $500 bonus | Trade at least $25 |
| Polymarket | $20 trading bonus | Deposit $10 |
| Crypto.com | Up to $250 in match bonus | Deposit at least $125 |
An overview of our top operators
Particularly when it comes to sports prediction markets in the US, the platforms we’ve mentioned above are reputable. For better insight, we’ve provided an overview of the operators individually.
Kalshi – 15 up to $500 bonus
Kalshi: Pros & Cons - Broad range of markets
- 24/7 live chat support
- Huge reputation
- Native mobile app
As a CFTC-designated market, Kalshi’s event contracts operate under federal oversight. Alongside markets in politics, weather, and other categories, the platform lists tennis event contracts, including majors and ATP/WTA tour stops with some main draws on July 28. As mentioned above, Kalshi ties its bonus offer to a $25 minimum trade amount and a $10 deposit. Once you meet the requirement, the amount you can get ranges from $15 to $500.
In addition, trading requirements apply to the bonus credits and Kalshi’s overall availability varies by state. Also, our Kalshi review brings you a broader breakdown of the current terms and markets available on the platform.
Polymarket – $20 trading bonus
Polymarket: Pros and Cons - Numerous markets on sports, crypto, the economy, and politics
- Regulated by the CFTC
- Multiple rewards for existing traders
On returning to the US market as a CFTC-regulated exchange, Polymarket now offers its services with a mobile app eligible in most U.S. states. Its welcome offer generally requires a $10 deposit to unlock a $20 trading bonus, which applies to DC Open markets and other major sporting events. The platform also has deep liquidity across sports, politics, and financial markets, as discovered in our Polymarket review.
Crypto.com: Pros and Cons - Welcome bonus
- Broad range of markets
- High-performance mobile app
Crypto.com builds its prediction markets into an existing app with a dedicated sports markets trading section. New players can grab up to $250 in bonus funds when they sign up and deposit at least $125 on the platform. Note that the promotional terms change often, and sports contract availability currently excludes Nevada and New York explicitly. Nevertheless, the bonus offer is quite straightforward, and you do not compulsorily require a Crypto.com promo code to partake of it.
Overall, availability and regulatory activity around sports event contracts remains active in several states, so eligibility can shift close to the DC Open. We do suggest that you track new platform offers as well as ongoing legal developments on our prediction market news page from time to time.
Kalshi, Polymarket, and Crypto.com each bring decent bonus offers to complement the DC Open. Eligible traders can explore bonus packages, including Polymarket’s straightforward $20 bonus, Kalshi’s potential $500 offer, and Crypto.com’s 100% match bonus of up to $250. Of course, deposit minimums, expiration windows and eligibility by state all differ, so we recommend that you review each platform before signing up. To get started, click the link on this page to sign up and claim your bonus offers to trade on the DC Open this week.