Onyx Slots runs a bonus programme that covers more ground than most UK casinos attempt. New accounts pick up a matched deposit offer across the first two top-ups, regulars collect a reload every Friday, and the VIP cashback tier pays out with no wagering string attached. The Onyx Slots bonus structure rotates throughout the month, so returning to the Promotions page each week produces genuine results rather than wasted clicks.
Two deposits, two separate matches. Onyx Slots spreads the welcome offer across your first and second top-ups rather than front-loading everything onto day one, which gives you more time to get comfortable with the casino before the bulk of the wagering clock starts ticking.
Onyx Slots matches your first deposit 100% up to £200, with 35x wagering applied to the bonus portion. Deposit £100 and Onyx Slots credits another £100 in bonus funds — you then wager £3,500 in total before withdrawing anything derived from that bonus. Free spins on Book of Dead or Gates of Olympus accompany the offer, credited in four daily batches of 25.
Your second deposit earns a 50% match up to £100. Combined, the two-stage welcome package can put £300 in bonus funds into your account. Both stages carry 35x wagering on the bonus portion, and each expires 14 days after credit. Missing the expiry window forfeits whatever bonus balance remains — so plan deposits with enough runway to clear the requirements.
Onyx Slots does not require a bonus code at the standard welcome stage. Onyx Slots bonus codes do appear periodically for seasonal campaigns or email-exclusive offers — those get entered in the Cashier at the point of deposit, before you confirm the transaction.
Claim BonusAfter the welcome period ends, Onyx Slots keeps three standing promotions running in parallel. Each targets a different playing habit, so the weekly cadence rewards you whether you deposit once a week or play every day.
Every Friday between noon and midnight, Onyx Slots offers a 50% reload bonus up to £75 on any deposit made during that window. Wagering sits at 30x on the bonus portion — lower than the welcome offer — which makes Friday the most cost-effective deposit day on the calendar for clearing bonus funds.
Onyx Slots credits 10% cashback on net losses each Monday, covering the previous seven days of play. The cap is £100 per week, and the funds carry no wagering requirement. You can withdraw cashback the same day it arrives if you prefer liquidity over bonus play.
Twice a month, Onyx Slots pushes unannounced bonus drops to eligible accounts. Past drops have included 25 free spins on new Pragmatic Play releases, a £10 bonus on a midweek Tuesday, and leaderboard tournament entries. Enabling email or SMS notifications is the only way to catch these before they expire — the Promotions page updates after the drop has already been claimed by a portion of eligible players.
Register NowOnyx Slots runs two tournament formats. The first is a 72-hour slot sprint, reset every Monday morning. The second is a monthly leaderboard campaign with a prize pool that has reached £5,000 in recent competitions. Entry to both is free — you qualify by playing any featured game during the active window, with leaderboard position determined by points scored per £1 wagered rather than raw total bets.
Top-three positions on the monthly leaderboard pay in real cash with no wagering attached. Positions four through twenty receive free spins bundles, scaled by rank — 20th place still collects 30 free spins on the featured slot. Weekly sprints pay smaller cash amounts across the top ten, with the winner typically taking £150 to £200 depending on that week's entry volume.
The Tournaments tab at Onyx Slots shows every live and upcoming event, including start times, eligible games, and current leaderboard positions. Checking this at the start of each week takes two minutes and tells you which slots to prioritise if you plan to compete seriously that week.
Five tiers: Bronze, Silver, Gold, Platinum, and Black. Every £10 wagered in real money earns loyalty points, regardless of which tier you currently occupy. The tier determines your cashback rate, withdrawal speed, and whether Onyx Slots assigns you a personal account manager.
Bronze to Silver requires 2,000 loyalty points — achievable within a fortnight at moderate play volumes. Gold demands 7,500 total points, Platinum 20,000, and Black sits by invitation only for players sustaining Platinum-level activity over three consecutive months. Points never expire as long as your account logs at least one real-money wager every 90 days.
Onyx Slots publishes full terms on every promotion page. The three clauses below trip up the most players — knowing them before you claim saves frustration after the fact.
Slots contribute 100% toward wagering requirements. Live casino games count at 10%. Most RNG table games contribute 0%. If you plan to clear a 35x wagering requirement through blackjack, the maths work against you — a £3,500 requirement becomes effectively £35,000 in table play. Onyx Slots lists eligible games on each promotion page.
The minimum qualifying deposit for any Onyx Slots casino bonus is £10. A deposit of £9.99 or less will not trigger an active promotion, even if you selected it before depositing. This catches out players topping up small amounts to test a new payment method.
Bonus funds expire 14 days after credit. Free spins expire 48 hours after issue. Wagering must fully clear before either window closes — Onyx Slots forfeits whatever bonus balance and associated pending winnings remain at the expiry point. The clock starts from credit, not from first use.
Free spins at Onyx Slots expire 48 hours after issue — claim them on a day when you have time to use all of them, not as a throwaway top-up before logging off.