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A multi-market casino across Romania, Denmark, Spain, and the Netherlands
Visit One Casino →One Casino welcome bonus in Romania
Context for Romania: Romania's check runs the opposite way to most people's instinct, and getting it backwards is the common mistake. The ONJN publishes both a blacklist of unlicensed domains and a WHITE LIST of licensed operators - Class I for operators, Class II for suppliers - and only the white list makes play lawful. A site being absent from the blacklist proves nothing: you will probably still be able to reach it, but playing there is unlawful unless it appears on the white list. The blacklist is large and actively enforced - 1,546 domains have been ordered blocked by ISPs, and Polymarket was added on 29 October 2025. Check any operator against the Class I list at onjn.gov.ro before depositing rather than trusting a licence badge or an affiliate page, this one included. The market is also tightening fast: Law 141/2025, in force from 1 August 2025, raised the annual authorisation tax from 21% to 30% of gross gaming revenue and the minimum annual fee from EUR 400,000 to EUR 480,000; operators need a permanent establishment in Romania and, where their servers sit abroad, mirror servers on Romanian soil giving ONJN real-time access. Advertising rules are moving too - celebrity and influencer endorsements are already banned across TV, radio and social media, Bucharest is removing gambling publicity from city-controlled outdoor sites from 1 January 2026, and the regulator's 2026 agenda proposes raising the gambling age from 18 to 21 plus restricting online promotions between 06:00 and midnight.
Here is the current One Casino welcome offer for players in Romania. Bonus terms change and are set by One Casino for each market — always confirm the live offer on its own site. See every licensed betting site in Romania →
Pros
- Genuine multi-market licensing: ONJN, Danish authority, and Dutch KSA
- A real standout: no-deposit components in Denmark, Spain, and the Netherlands
- Romania's package reaches up to 3,000 RON plus 600 free spins
Cons
- Spain requires 30 days plus KYC before the bonus is released
- Multiple market-specific offers add complexity to compare value
- Ownership/parent-company structure not independently confirmed
Our verdict
One Casino is a genuinely multi-licensed casino, holding an ONJN licence (Romania), a Danish licence, and a KSA licence (Netherlands). Romania: up to 3,000 RON plus 600 free spins across three deposits. Denmark: 100 free spins no-deposit plus a 100% match up to €100 and €10 free. Spain: €10 no-deposit plus 100% up to €100. Netherlands: €10 registration bonus plus 50% up to €100, plus a no-strings €10 sports free bet. We found no regulatory action against this operator in the sources we consulted, which is a statement about our research rather than about the operator.
How we rated it
Bonuses & value (18%)8.5
A real standout: no-deposit bonuses in Denmark, Spain, and the Netherlands, plus a large Romanian package up to 3,000 RON.
Trust & licensing (27%)7.8
A real positive: genuine ONJN, Danish, and KSA licences across three of four markets.
Casino (36%)7.5
A genuinely multi-market operator, licensed by ONJN, a Danish authority, and the Dutch KSA.
Customer support (18%)7
No major documented complaint pattern found.
Quick facts
| Licensing | Genuine ONJN (Romania), Danish, and KSA (Netherlands) licences |
| Markets | Romania, Denmark, Spain, Netherlands |
| Welcome bonus | RO: up to 3,000 RON + 600 FS; DK: 100 FS no-dep + 100% up to €100; ES: €10 no-dep + 100% up to €100; NL: €10 + 50% up to €100 (+€10 sports free bet) |
| Wagering | 35x across markets; ES bonus released after 30 days + KYC per RD 958/2020 |
How we verified this
One thing we could not establish: who owns and operates this brand. The rest of this review is sourced, but an operator we cannot name is one you cannot hold to account.
One Casino holds an ONJN licence (L1244215W001560) for Romania, a Danish licence, and a KSA licence for the Netherlands. No major scandal independently confirmed in this pass. Romania: package up to 3,000 RON plus 600 free spins across 3 deposits, 35x wagering. Denmark: 100 free spins no-deposit plus 100% first deposit up to €100 and €10 free, 35x wagering, weekly no-deposit bonuses for Club One members. Spain: €10 no-deposit plus 100% up to €100, bonus released after 30 days plus KYC under RD 958/2020. Netherlands: €10 registration bonus plus 50% up to €100 on the first deposit (casino), and a €10 no-strings-attached free bet on sportsbook. Confirm current offer directly on One Casino's own site.
Where One Casino is licensed
One Casino appears on the official register in 4 countries. Highlighted countries have a full local review — pick yours for its welcome bonus and licence details.
Europe (4)
About One Casino
One Casino is a casino licensed across Romania, Denmark, and the Netherlands, also serving Spain, offering genuinely large and often no-deposit welcome packages in each market. We found no regulatory action against this operator in the sources we consulted, which is a statement about our research rather than about the operator.
One Casino FAQ
Is One Casino safe and legit?
Yes — One Casino holds genuine licences from ONJN (Romania), a Danish gambling authority, and the Dutch KSA. No major scandal was found during this research.
What is the One Casino welcome bonus?
It varies by market: Romania offers up to 3,000 RON plus 600 free spins across three deposits; Denmark offers 100 free spins no-deposit plus a 100% match up to €100 and €10 free; Spain offers €10 no-deposit plus 100% up to €100; the Netherlands offers €10 plus 50% up to €100 on casino, plus a no-strings €10 free bet on sportsbook.