4.6 / 5 5 Ratings

10 No Deposit Free Spins on Zeus vs Hades Gods of War!

Available for new registrations only. Max 10 no deposit bonus spins credited upon SMS validation. Zeus vs Hades Gods of War only. 60x Wagering, 4x max bonus conversion. Full T&Cs apply. Full terms apply


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4.4 / 5 10 Ratings

Onyx Slots Sign Up Offer & Review

Onyx Slots is a UKGC-licensed online casino site run by Grace Media with a classic casino theme. With over 650 casino and slot games, OLBG readers are welcomed with an exclusive no deposit bonus spins offer. They have a range of payment methods including PayPal and process withdrawals within 24 hours.

About Onyx Slots

Onyx Slots provides a safe, exciting and fun place to play the newest and best mobile casino games

Onyx Slots Key Facts

  • New Online Casino
  • Wager-Free Offerings on Spins
  • Truly Mobile-First Design

Maximum Bonus: 10
Offer type: New Accounts
Casino Betting Offer: Yes
See the offer & Join!
In this review: Onyx Slots offer

Before you open your Onyx Slots Account

Full guide to everything you need to know before you click the link and sign up.

Latest Onyx Slots Offer - Full Details

Onyx Slots Welcome Offer banner

Welcome Offer Details
🎁No Deposit Bonus Spins10 on Zeus vs Hades Gods of War
🎁Wagering Requirements60 x Bonus Funds
🎁 Max Bonus Cashout4 x Bonus (up to £100)
🎁Expiry7 Days

Onyx Slots has an exclusive casino welcome offer for OLBG readers. It consists of 10 no deposit spins on Pragmatic Play’s Zeus vs Hades Gods of War slot game.

Validate via SMS

To claim this offer, you need to create an account and then validate your account via SMS (text message). Once done, open/launch Zeus vs Hades Gods of War and the free spins will be there waiting for you.

The bonus spins are worth 10p each with any winnings awarded as bonus funds. Bonus funds come with a wagering requirement of 60 times the bonus amount awarded. This needs to be met to be converted into cash. There is a cap on the amount you can convert into cash, which stands at 4 times the bonus amount up to £100.

Furthermore, the bonus funds convert automatically into cash once the wagering requirements are complete. Lastly, the bonus spins, once credited, are valid for 7 days. If you don’t complete the wagering requirements in this period, any remaining bonus funds/spins will be removed from your account.

In terms of wagering requirements, they must be completed on the titles in the ‘Welcome Slots’ tab on the Onyx Slots website. There are many top slot games to play including:

More No Deposit Bonus Offers

If you want another risk-free offer, Hot Streak Slots gives you 10 no deposit bonus spins on NetEnt’s Finn and the Swirly Spin.

Another option is MadSlots who reward you with 100 no deposit free spins on Pragmatic Play’s Big Bass Splash. There is also up to £200 in bonuses and a further 200 free spins on your first 3 deposits. Deposit for the first time to get a 100% bonus up to £200. On your second and third deposits, you will get 100 free spins on Book of Dead and 100 free spins on Scroll of Dead respectively.

Why do bookmakers ask for 'Proof of Funds'?

Why do bookmakers ask for 'Proof of Funds'?

Payment Methods

Method Min Max Processing Time Fee
£5 £2000 Instant Free
£5 £2000 Instant Free
£5 £2000 Instant Free
£5 £2000 Instant Free
£5 £2000 Instant Free
Method Min Max Processing Time Fee
£10 £10000 24 Hours Free (£1.50 under £30)
£10 £10000 24 Hours Free (£1.50 under £30)
£10 £10000 24 Hours Free (£1.50 under £30)
£10 £10000 24 Hours Free (£1.50 under £30)
£10 £10000 24 Hours Free (£1.50 under £30)

Like sister site Cosmic Spins, Onyx Slots has a variety of reputable and secure payment methods in the UK. They include PayPal, VISA and Mastercard debit cards, Trustly and MuchBetter. If you want to test the waters, they also offer a £5 minimum deposit amount on all payment methods.

The maximum deposit is £2,000 with every transaction with limits of £99,000 daily, £250,000 weekly and £500,000 monthly. Head to the ‘My Account’ section to set your own limits.


Withdrawing your winnings at Onyx Slots is simple. The minimum withdrawal amount is £10 with the maximum £10,000 for every transaction. If you are lucky enough to have more than £10,000 cash in your account, multiple withdrawal requests must be made.

In terms of withdrawal times, Onyx Slots processes cashouts within 24 hours. With up to 48 hours taken for requests to be reviewed and processed by the support team, withdrawals are free of charge unless you want to cash out under £30. In this case, a £1.50 processing fee will be incurred.

Furthermore, you’ll be pleased to learn that withdrawals are processed at weekends. I found that my requests were processed within a few hours once I successfully verified my account. PayPal is my chosen payment method as it’s generally the fastest, including at Onyx Slots.

Your funds are held in separate bank accounts, in keeping with the Gambling Commission’s requirements, but they would form part of the assets of the business in the event of insolvency

Full Onyx Slots Casino Review

Researched and reviewed by Chris Taylor and fact-checked by Sam Darkens, OLBG’s in-depth and comprehensive Onyx Slots review considers the important factors including the website and mobile offering, the payment methods they offer as well as withdrawal times and the range of casino, slot and live dealer games you can play.

Chris Taylor

Chris Taylor

The king of slots

Chris Taylor is an industry veteran originally from Gibraltar. Having worked in the online gambling industry since 2004, Chris loves slots and has reviewed over 10,000 online slot games. Running a slots-focused website for 13 years, Chris is the go-to guy for everything slots-related. 

👨‍🏫 Specialist Subjects🔬📚

Chris’ online gambling career has spanned more than 2 decades. This includes working for online casino sites, consulting for software/slot providers and running his own slots portal. 

With a passion for slots, Chris reviews games from an honest and blunt point of view to give readers an accurate portrayal of the slots they might play. The slot games are just the start as Chris deep dives into the slot sites to provide factual and insightful information as to where to play the games he so loves. 

We also look at how to get in touch with their customer support team, the promotions and offers for Onyx Slots customers, security and how to verify your account. OLBG’s How We Rate article goes into more detail if you want a more detailed insight into how we conduct our reviews. To jump straight to the relevant section, use the jump links below:

Onyx Slots at a Glance
⏳ Online Since2024
⚖️ UKGC Licence✅ (56784)
🏢 CompanyGrace Media Limited
🎁 Welcome Offer10 No Deposit Bonus Spins
🎰 Casino Games + Slots650+
💰 Withdrawal Time24 Hours
📱 Mobile Compatibility
☎️ Customer Support24/7

Below are a series of jump links that take you to specific parts of this review:

🤔 Pros & Cons

🎰 Casino & Slot Games

🎁 Promotions & Offers for existing customers

📱 Website & Mobile Compatibility

☎️ Customer Support

🔒 Security & Account Verification

Onyx Slots Pros & Cons

OLBG isn’t here to provide a glowing and positive review of casino sites we recommend. We accept there are pluses but our aim is to offer a balanced review which also includes highlighting the negatives (if any). Below, you’ll find a list of Onyx Slots pros and cons:

👍 Pros 

  • Exclusive No Deposit Bonus Spins offer
  • Easy-to-use-website that is mobile-friendly
  • Fast withdrawals including PayPal
  • All the best slot games from top providers

👎 Cons

  • No dedicated mobile apps
  • Could do with more payment methods
  • No progressive jackpot games

Casino & Slot Games

Onyx Slots Casino and Slot Games banner

  • 650+ slot games
  • Dedicated Megaways section
  • Most popular slot studios

At Onyx Slots, you can enjoy a wide range of the best table games such as roulette and blackjack (powered by Evolution). The focus, of course, is online slot games. You can find titles from Microgaming (Games Global), Play ‘n GO, Pragmatic Play and NetEnt. In total, there are over 650 casino games and slots to choose from.

With player favourites and classic slots available, below is a list of all studios/slot providers with some of their best games you can play at Onyx Slots:

  • Microgaming (Games Global): Immortal Romance, Thunderstruck 2 and Hyper Gold
  • Play ‘n GO: Book of Dead, Rise of Olympus + Alice Cooper and the Tome of Madness
  • NetEnt: Dead or Alive 2, Gonzo’s Quest + Starburst XXXtreme
  • Pragmatic Play: Wolf Gold, Sugar Rush 1000 + Gates of Olympus
  • Big Time Gaming: Spicy Meatballs Megaways, Bonanza Falls + Donuts
  • Blueprint Gaming: The GOAT, Wish Upon a Jackpot + Eye of Horus
  • Eyecon: Fluffy Favourites Megaways, 99 Time and White Wizard
  • Inspired Gaming: Reel King, Scarab Gold + Slots O’ Luck Free Spins
  • Iron Dog Studio: Apex Strike Megaways, Savannah Strike + Luck of the Dragon
  • Light & Wonder: Gremlins, Christmas Krampus + Rainbow Riches
  • ELK Studios: Book of Sam, Cygnus 3 + Dirty Dogs of Nitropolis
  • Red Tiger: Dragon’s Mirror, London Tube + Case Closed

If you know what you’re looking for, use the search function. You have the ability to filter by studio/slot provider but you will find games from Big Time Gaming, ELK Studios and Blueprint Gaming for example in the NYX tab. On the Onyx Slots site, games are split up by Hot Slots, New, Featured, Drops and Wins, Luck of the Irish, Welcome Slots and Megaways.

If you want to play slots with Megaways, you’re in luck. With a dedicated Megaways tab, all Megaways slots won’t be located there, unfortunately. That said, here are some of the best to use the shape-shifting mechanic:

Slot GameMegawaysRTPMax Win
Bonanza Megaways117,64996%26,000 x
Rick & Morty Megaways117,64996.55%50,000 x
Gonzo's Quest Megaways117,64996%21,000 x
Rainbow Riches Megaways117,64996%12,500 x
The Dog House Megaways117,64996.55%12,305 x

Slot Studios & Jackpot Slots Not Available

On the other hand, Onyx Slots doesn't have as many slot games as other slot sites. There are no games from the likes of Nolimit City, Push Gaming, Relax Gaming and Playtech to name a few. You also won’t be able to play jackpot slots like Mega Moolah (Microgaming) or Mega Fortune (NetEnt).

If you want a bigger slots catalogue or want the chance to win 7 or even 8-figure progress jackpots, OLBG recommends Casushi Casino.

4.9 / 5 8 Ratings

Casushi Review

  • No. of slots 1110
  • Payout speed 24 hours
  • Win rate 97%

Inspired by Japanese culture and food, Casushi is a unique and fun online casino that wants to help you find your “Zen of Happy Play.”

  • Excellent website deisgn
  • New slots constantly added
  • PayPal available for UK users

Promotions & Offers

When it comes to rewarding their loyal customers, Onyx Slots doesn’t stop at the exclusive no deposit welcome offer. Located in the ‘Promotions’ tab (once logged in), they offer the same offers as sister casino Cosmic Spins.

They include bonus spins, Drops & Wins cash prizes, a Lucky Wheel and cash spins. Below are details of current promotions at the time of writing:

  • Drops & Wins: Created in conjunction with Pragmatic Play, there are £2 million worth of cash prizes every month with more than £40 million awarded since 2020. There are 6,500 cash prizes to be won daily with a top prize of £2,500. You can win a share of £40,000 in Daily Tournaments with a top prize of £5,000.
  • Lucky Wheel: Depositing £10 or more will see you qualify for a guaranteed prize on Onyx Slots’ Lucky Wheel. Depositing £50+ will see you spin the Enhanced Lucky Wheel. Prizes include up to 40 bonus spins on Big Bass Bonanza or 25 cash spins on Cowboys Gold.
  • Cash Spins: If you deposit and stake £20 on slots, you’ll get 10 cash spins a selected Play ‘n GO slot game (Boat Bonanza Colossal Catch, Cat Wilde and the Pyramids of Dead or Boat Bonanza Down Under). With no wagering requirements, you can claim this offer 3 times for a total of 30 cash spins.  
  • Bonus Spins: There are various bonus spins offers available at Onyx Slots. You can get up to 90 bonus spins on a selection of Pragmatic Play games by depositing £60 or more. Alternatively, deposit £10 to get 50 bonus spins on John Hunter and the Book of Tut game.

Onyx Slots Site + Mobile

Onyx Slots Website and Mobile Site banner

  • New UK online casino site
  • Mobile and tablet-friendly
  • No iOS or Android mobile apps

The Onyx Slots website is compatible with laptop, PC, mobile and tablet devices. Nicely laid out, it has a classic casino theme with dedicated tabs for Rewards, Promotions and Support. At the very top, you’ll see your cash and bonus balances as well as a yellow button to Deposit easily.

The carousal in the middle of the page will display various promotions, offers and new game offerings. Under that, casino games are categorized by various sections including Hot Slots, New, Feature, Drops and Wins, Welcome Slots, Table Games, Instant Win games and Megaways. Look out for the ‘Search All Games’ button where you can locate your favourite games instantly. As mentioned above, you can filter your search results by slot provider/games studio.

Compatible with all mobile devices, there are no dedicated iOS or Android casino mobile apps. On the flip side, the same layout can be found on smartphones and tablets as on desktop devices (laptops and PCs). Built with mobile casino players in mind, the site is easy to navigate and use.

Best Casino Apps UK (iPhone - Android)

Best Casino Apps UK (iPhone - Android)

Customer Support

Customer Support
📆 Availability24/7
💬 Live Chat✅ (on site)
❓ FAQs ✅ (on site)
📨 Emailonyxslots@gracemediasupport.com
📲 SMS Message+447458159505

If you have a query or more information, the Onyx Slots customer support team is on hand 24/7, 365 days a year. Located in the United Kingdom, you can contact their team via Live Chat, SMS text, email and via on-site messaging.

With a detailed and comprehensive FAQs section, you’ll find information on:

  • Login and Registration
  • Account Verification
  • Deposits and Withdrawals
  • Bonuses and Promotions
  • Safer Gambling
  • Bingo
  • Technical Support
  • Other

Security & Account Verification

🇬🇧 Gambling Commission (UKGC)56784
🇬🇮 Gibraltar Gambling Commission125

Part of Grace Media Limited, and like sister casino Cosmic Spins, Onyx Slots is fully regulated and licensed by the UK Gambling Commission. Also holding a valid license from the Gibraltar Gambling Commission (for players located outside the UK), their license numbers can be found in the table above.

As part of their UKGC license, all Onyx Slots players need to confirm their identity before gambling for real money. With part of the verification process done automatically when you register your account, the terms of their license stipulate that all customers are 18 or over and have the funds to gamble responsibly.

Onyx Slots have a ‘Document Uploader’ function located within the ‘My Profile’ section of your account. Here, choose ‘Upload Documents’ to provide the following:

  • Proof of Address: Utility Bill (i.e. gas, electricity, water, TV, internet, mobile)
  • Payment Methods: Front side of debit card (last 4 digits must be visible) and back side of debit card (covering the CVV2 code). Bank Statement: shows your main source of income such as your salary.

When providing documents, make sure all 4 corners are clearly visible. Not bigger than 10MB, accepted file formats include JPG, GIF, PDF, TIFF, BMP and PNG. Proof of Address documents cannot be older than 3 months.

You may be subject to Proof of Funds checks where you may need to provide information on your occupation, a copy of your bank statement, payslips and salary details.

Why do bookmakers ask for 'Proof of Funds'?

Why do bookmakers ask for 'Proof of Funds'?

As part of the Gambling Commission’s Responsible Gambling policy, Onyx Slots has a number of account options and controls in place to help you gamble online safely. The range of tools available include:

Responsible Gambling Tools
Online Account History
Reality Checks
Deposit Limits
Cooling Off Periods
Onyx Slots is audited by the leading independent and internationally approved testing agency eCOGRA. They focus on testing, inspection and certification of online gambling software and systems (according to their website).
  • Who owns Cosmic Spins?

    Cosmic Spins Casino is owned and run by Grace Media Limited, a company licensed by the UK Gambling Commission  and Gibraltar Gambling Commission.

  • What is the Cosmic Spins bonus?

    The Cosmic Spins welcome offer consists of a 100% bonus match up to £100 (deposit £10-£100). Once you deposit, you’ll get 100 bonus spins to use on NetEnt’s Starburst slot game.

  • Can I play at Cosmic Spins on my mobile device?

    The Cosmic Spins site is compatible with laptop, PC, tablet and smartphone devices. With no dedicated mobile apps, all the functionality of the desktop site is available on your mobile.

  • How many Cosmic Spins slots are there?

    Cosmic Spins has over 650 slot games to play including titles such as Starburst, Book of Dead, Fluffy Favourites, Sweet Bonanza, Big Bass Splash and Bonanza Megaways.

  • What payment methods can I use at Cosmic Spins?

    At Cosmic Spins, you can deposit and withdraw using debit cards, PayPal, MuchBetter and Trustly. With all payment methods, there is a £5 minimum deposit.

  • How quickly do Cosmic Spins process withdrawals?

    All withdrawal requests are processed within 24 hours. With PayPal and Trustly cashouts are normally processed within a matter of hours, you will incur a £1.50 fee if you withdraw under £30.

Onyx Slots Info & Bookmakers Reviews

Check What Others Say About Onyx Slots and Write Your Own Review

4.4 / 5
  • Ratings: 10

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