Onyx Odds Promo Code BOOKIES $100 Bonus For NCAA & NBA Predictions on Mar. 21

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By Adam Martin

Mar 21st, 2026 2:25 PM EDT

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What Is Onyx Odds?

Onyx Odds is a free-to-play social sportsbook and prediction platform. It lets users make sports picks using virtual currency known as Onyx Coins. Operating in a sweepstakes-style format, Onyx Odds mirrors the experience of traditional legal sports betting apps. It allows users to make picks on major leagues such as the NFL, NBA, NHL, MLB, and more.

When your picks win, you earn additional Onyx Coins. These coins help you progress through loyalty tiers, enter promotional sweepstakes, and unlock Onyx Cash. Consequently, Onyx Cash can be redeemed for real money.

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Onyx Odds offers sports fans in states without regulated sports betting a compliant way to make predictions. This is done through a sweepstakes-style platform.

Signing up is quick and free, with no purchase required to get started. New users can explore the platform immediately. However, completing identity verification opens access to key features, including reward redemptions and certain promotions.
Onyx Odds uses a dual-currency system. Onyx Coins function as virtual credits and are granted at signup, through daily rewards, and via optional purchases that enhance gameplay. These coins have no cash value and cannot be withdrawn. Additionally, Onyx Cash is promotional currency earned through sweepstakes entries, bonus offers, or winning predictions. Once users meet the minimum balance, Onyx Cash can be redeemed for real money.
Making picks is straightforward. Users browse prediction lines across major sports and events, choosing outcomes such as winners or over/under totals. Selections can be placed using either Onyx Coins or Onyx Cash. Successful picks may return more currency or loyalty points. The platform also includes features like same-game parlays and live, in-game markets.
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Best Bets for NCAA Tournament Games on March 21

(1) Duke vs. (9) TCU — 5:15 p.m. ET | CBS

SPREAD	MONEYLINE	TOTAL
Duke -11.5	Duke -750 / TCU +525	139.5 o/u

Duke enters as the top overall seed after dispatching their opening opponent, but concerns linger about depth and health. The Blue Devils are without floor general Caleb Foster (fractured foot) for the foreseeable future, and Patrick Ngongba II remains questionable with foot soreness—he hasn't played since March 2. TCU shocked Ohio State in round one and brings a disciplined defensive system that held the Buckeyes 12 points below their season average.

Pick: TCU +11.5 — Duke's offensive efficiency drops significantly without Foster's playmaking, and if Ngongba sits, the Blue Devils lose their second-leading scorer. TCU held Ohio State to just 68 points and ranks 18th nationally in adjusted defensive efficiency per KenPom. In tournament games decided by single digits, underdogs of 10+ points have covered 62% of the time over the past five seasons. The Horned Frogs won't win outright, but their defensive discipline and Duke's depleted roster make this spread inflated by three points.

(3) Illinois vs. (11) VCU — 7:50 p.m. ET | CBS

SPREAD	MONEYLINE	TOTAL
Illinois -11.5	Illinois -590 / VCU +425	151.5 o/u

Illinois dominated its first-round opponent behind David Mirkovic's monster 29-point, 17-rebound performance, but now faces a VCU squad riding serious momentum after erasing a 16-point deficit to stun North Carolina in overtime. The Rams' havoc defense forces 16.8 turnovers per game (14th nationally), and Terrence Hill Jr. is playing at an All-American level with 34 points in the UNC upset. Illinois went just 4-6 ATS as double-digit favorites this season.

Pick: VCU +11.5 — Illinois struggled against elite defensive pressure all season, averaging 19.2% turnover rate against top-50 defenses compared to 14.1% against everyone else. VCU's "Havoc" system thrives in neutral-site tournament environments where Illinois can't rely on home-court advantages. The Rams are 9-3 ATS as underdogs this season, and Hill's 34-point eruption signals he's locked in. Lay the points with the live underdog getting nearly two possessions of cushion against a team that consistently plays down to competition.

Make sure to check out our March Madness Betting Guide for more NCAAB Tournament 2026 tips, betting strategy, and more!

Onyx Odds Promo Code FAQ

What Is The Onyx Odds Promo Code?

New customers can sign up using the promo code BOOKIES. Sign up for a new account and use this bonus to play $10 and get 100 in free picks.

Can I Redeem Onyx Cash for Real Money?

How Long Do Withdrawals Take at Onyx Odds?

About the Author

Adam Martin

More About Adam

Adam Martin is a betting analyst and DFS betting expert for Bookies.com who has covered professional sports, with an emphasis on sports gambling, for more than a decade. He is an authority on UFC betting, while also covering the NBA, NFL, NHL, and MLB.