A Duel referral code is the string you attach to a new account so the platform knows which partner sent you. It takes two seconds to apply and it is the only step that links you to ongoing rakeback. Skip it, and there is no way to add it later.
What a Duel referral code actually unlocks
Unlike a deposit-match bonus, a referral code does not drop locked credit into your wallet. Instead it ties your account to a rakeback stream — a share of the house edge paid back on every bet. That is a more honest deal, because there is nothing to wager off before you withdraw.
- Applied once, at registration.
- No wagering, no expiry on the rakeback itself.
- Cannot be added retroactively to an existing account.
Where to enter the Duel referral code
- Open the signup page.
- Find the "Referral" or "Promo code" field.
- Enter BONUSUP before you confirm.
- Finish verification and deposit as normal.
Referral code vs promo code
On Duel the two terms point to the same field. Whether a page calls it a Duel referral code or a promo code, you enter the same value. For the full breakdown of what each does, see our promo code guide and the rakeback hub.
One caution: ignore any code that promises "free credit" or a guaranteed deposit match. As we cover in spotting fake codes, those are almost always bait.