Memorial Day brings a marquee NBA showdown as the Knicks vs. Cavs face off in Game 4 of the Eastern Conference Finals at 8 p.m. ET on ESPN. New York aims to finish the series, while Cleveland looks to respond under pressure in one of the most-watched playoff matchups of the week. This game is also driving strong interest in prediction markets, where users actively trade on outcomes rather than relying on traditional betting lines.
If you’re exploring the best prediction market apps, this is one of the most active moments of the postseason. Platforms like Kalshi, Polymarket, Novig, and ProphetX are running NBA prediction market promos that make it easier to get started with NBA playoff trading. These NBA prediction market promos give new users bonuses and deposit matches that help them engage with high-profile games like Knicks vs. Cavs right away.
With an ESPN primetime slot and Eastern Conference Finals stakes, Game 4 creates a high-volume environment for NBA prediction market promos and real-time trading activity. Below, we break down the top offers so you can sign up, fund your account, and start trading before tipoff.
| Prediction Markets | NBA Prediction Market Promos | Sign-Up Link |
|---|---|---|
| Kalshi | Trade $10, Get $10 Bonus | ACTION |
| Polymarket | Deposit $20, Get $50 in Bonus Funds | ACTION |
| Novig | Spend $5, Get $50 in Novig Coins | ACTION |
| ProphetX | 20% Purchase Match, Up to $100 in Bonus Funds | ACTION |
Best NBA Prediction Market Promos: Trade on Knicks vs. Cavs Game 4 Today
Here’s a breakdown of the top NBA prediction market promos for today’s Knicks vs. Cavs Game 4, including new-user bonuses and platforms offering the most upside for NBA playoff trades.
Kalshi
- Kalshi Promo Code ACTION: Trade $10, Get $10 Bonus
- States Available: AL, AK, AR, CA, CO, CT, DE, FL, GA, HI, ID, IN, IA, KS, KY, LA, ME, MN, MS, MO, NE, NH, NM, NJ, NY, NC, ND, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY, DC
Late May playoff action drives heavy liquidity into Kalshi, and you can tap into it immediately. Sign up with the Kalshi promo code ACTION (also called the Kalshi referral code ACTION) and trade $10 to unlock a $10 bonus. You then deploy that credit directly into NBA markets without waiting on complicated bonus steps. Knicks vs Cavs Game 4 offers a live, high-volatility spot where prices move quickly.
Kalshi gives you a different edge than sportsbooks because you trade directly with other users in real time. You can enter, adjust, or exit positions during the game rather than locking in a final result. Prices move in cents, so you clearly see probability shifts and react to momentum swings. That’s why the best NBA prediction market promos stand out here—you get bonus credit and immediate access to active playoff trading.
Polymarket
- Polymarket Promo Code ACTION: Deposit $20, Get $50 Trading Bonus
- States Available: AL, AK, AR, CA, CO, CT, DE, FL, GA, HI, ID, IN, IA, KS, KY, LA, ME, MN, MS, MO, NE, NH, NM, NJ, NY, NC, ND, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY, DC
Sign up for Polymarket and unlock the $50 bonus instantly by entering Polymarket promo code ACTION or Polymarket referral code ACTION during registration. Deposit at least $20 and complete your first trade to trigger the “Deposit $20, Get $50 Trading Bonus” offer. This gives you immediate trading power in a live prediction market instead of waiting or starting small. It consistently ranks among the best NBA prediction market promos for new users who want fast entry and real upside.
Use your bonus on Knicks vs. Cavs Game 4 by trading live “Yes/No” shares on game outcomes and totals. Buy early when prices lag momentum, then sell into swings as the market reacts to runs and injuries. You stay flexible—lock profits mid-game instead of waiting for final results like a sportsbook. That edge is why traders actively target playoff games when using the best NBA prediction market promos.
Novig
- Novig Promo Code ACTION: Spend $5, Get $50 in Novig Coins
- States Available: AK, AR, CA, FL, GA, HI, IL, IN, IA, KS, KY, ME, MA, MN, MO, NE, NH, NC, ND, OH, OK, OR, SC, SD, TX, VT, VA, DC, WI, WY
Claim the bonus on Novig by downloading the app and entering the Novig promo code ACTION during sign-up. You unlock the Spend $5, Get $50 in Novig Coins offer after completing a qualifying purchase. Fund your account and start placing or taking positions in minutes.
Use your bonus on Knicks vs. Cavs Game 4 by targeting spreads, moneylines, or totals in the prediction market. You can set Limit Orders to request better pricing instead of accepting standard sportsbook lines. This approach helps you find value in tight playoff games where odds move quickly and liquidity spikes. That’s why traders rank this among the best NBA prediction market promos, especially for high-variance matchups like Game 4.
ProphetX
- ProphetX Promo Code ACTION: 20% Purchase Match, Up to $100 in Bonus Funds
- States Available: AL, AK, AZ, AR, CA, CO, CT, DE, FL, GA, HI, ID, IL, IN, IA, KS, KY, LA, ME, MD, MA, MI, MN, MS, MO, MT, NE, NV, NH, NJ, NM, NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY
ProphetX gives new users a 20% purchase match, up to $100 in bonus funds when they sign up with the ProphetX promo code ACTION. You enter the code ACTION during registration and verify your account. Then you fund your account with a qualifying purchase to unlock the bonus. ProphetX applies the match automatically so you can start trading NBA markets quickly.
You can use that bonus on Knicks vs. Cavs Game 4 markets and trade real-time outcomes. Buy positions on moneyline, spreads, totals, or player props based on your read of the game. React fast to momentum swings since ProphetX prices move during live action. This is why many users track the best NBA prediction market promos around high-stakes playoff games.
