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Last updated ·Checked against published operator terms

Independent · Updated November 2026

Non GamStop Casino Providers

The studios that supply slots to non-GamStop casinos are, for the most part, the same studios that supply UK-licensed ones: Pragmatic Play, NetEnt, Play'n GO, Relax Gaming, Microgaming and Evolution. The casino's licence governs where the game can be offered; the studio's own certification governs what the game pays. That second fact is the one players miss, and it is the reason two casinos running the same title can show different returns.

The studio, not the casino, certifies the game

A casino licence permits an operator to offer gambling. It does not, by itself, certify the maths inside a slot. That certification comes from the game developer, which has its own testing arrangements and its own distribution agreements. When Pragmatic Play ships a title, the build is certified for the jurisdictions in which it is deployed, and the operator chooses which build to run.

This is why the provider list matters more than the game count. A casino is a shop; the studios are the manufacturers. Knowing that GoldenBet lists Evolution for live dealer and NetEnt for slots says more about what kind of shop it is than "4,000 games" ever will.

Who supplies what

Across the group, the named studios are concentrated at GoldenBet, which lists Pragmatic Play, Evolution, NetEnt, Play'n GO, Microgaming and Relax Gaming, and describes a library of 3,000-plus titles from more than fifty providers. The other operators state "multiple" providers and a library of roughly 4,000 titles without naming them individually — a difference in disclosure rather than necessarily in content, but one that matters when you are trying to check a claim.

Live dealer is a separate supply chain. Evolution dominates it, and GoldenBet names Evolution explicitly for its live casino. Where an operator lists a live casino without naming the studio, the sensible assumption is that it is one of the large aggregators, but it is an assumption and not a published fact.

Why the same slot can pay differently

Return-to-player is set per build, not per game name. A title can exist at several RTP configurations, and the operator deploys the one its market and agreement allow. UK-licensed casinos operate under Commission rules that require the published RTP to reflect what is actually deployed. Offshore, the figure shown in the paytable is the one that binds the operator you are playing at — which means the paytable, not a review site's database, is the number to read.

The practical implication is simple: if a specific RTP is why you play a particular slot, open the game's information panel at the casino in front of you. A figure quoted for the same game elsewhere, including on this site, describes a different deployment until you confirm otherwise.

Booming Slots and the "non GamStop provider" question

Booming Games is a studio, not a casino, and it does not hold a gambling licence in the sense an operator does — it supplies games to licensed operators. So "Booming Slots non GamStop" is really two questions: whether a given casino carries Booming titles, and whether that casino is outside GamStop. The second is answered by the casino's licence; the first by its provider list.

Booming's catalogue is smaller and more regionally focused than the majors, and its presence is not universal across this group. Where an operator does not name its providers, there is no reliable way to confirm from the outside that a Booming title is available, and the honest answer is to check the lobby rather than assume. The same logic applies to any niche studio: the provider list is the evidence, and its absence is the absence of evidence.

Operators and their stated libraries

  1. GoldenBetCuracao licenceRead our review

    Welcome bonus£1,500 across three depositsMin deposit £20

    Wagering
    35x
    Payout
    0–72h pending, then 1–5 days
    Payments
    8.8/10★★★★★★★★★★
    Check the licenceRegistry status worth verifying
  2. Cheeky WinsCuracao licenceRead our review

    Welcome bonus€1,000 + €600 + €400 across threeMin deposit £20

    Our Top PickPublishes its 30x wagering in the promotion terms

    Wagering
    30x
    Payout
    Instant–1h · 48h pending
    Payments
    8.6/10★★★★★★★★★★
    Read the terms30x wagering in the promo
  3. SuperbCuracao licenceRead our review

    Welcome bonus€4,500 total across depositsMin deposit £20

    Wagering
    30x
    Payout
    Instant–1h · 48h pending
    Payments
    8.4/10★★★★★★★★★★
    See the termsPackage total, not one bonus
  4. WinnerCasinoCuracao licenceRead our review

    Welcome bonus€10,000 across deposits, not oneMin deposit £20

    Wagering
    30x
    Payout
    Instant–1h · 48h pending
    Payments
    8.3/10★★★★★★★★★★
    Check the package€10,000 is a deposit total
  5. MaximalBetCuracao licenceRead our review

    Welcome bonus€4,000 stage 1, €6,000 stage 2Min deposit £20

    Wagering
    30x
    Payout
    Instant–1h · 48h pending
    Payments
    8.2/10★★★★★★★★★★
    Read the termsWagering adjustable at discretion
  6. Electric WinsCuracao licenceRead our review

    Welcome bonus€1,000 stage 1, codes publishedMin deposit £20

    Wagering
    30x
    Payout
    Instant–1h · 48h pending
    Payments
    8.0/10★★★★★★★★★★
    See the termsCodes published before sign-up
  7. Extreme SpinsCuracao licenceRead our review

    Welcome bonus€1,000 cap — €30,000 to clearMin deposit £20

    Wagering
    30x
    Payout
    Instant–1h · 48h pending
    Payments
    7.9/10★★★★★★★★★★
    Check the offer€1,000 cap, stated up front
  8. Galaxy SpinsCuracao licenceRead our review

    Welcome bonus€1,000 single stageMin deposit £20

    Wagering
    30x
    Payout
    Instant–1h · 48h pending
    Payments
    7.8/10★★★★★★★★★★
    See the offerSingle stage, no discretion clause
  9. 1000 SpinsCuracao licenceRead our review

    Welcome bonus€5,000 at 1000% — €150,000 turnoverMin deposit £20

    Wagering
    30x
    Payout
    Instant–1h · 48h pending
    Payments
    7.7/10★★★★★★★★★★
    See the termsLargest headline, largest obligation
  10. Doctor SpinsCuracao licenceRead our review

    Welcome bonus€5,000 across the ladderMin deposit £20

    Wagering
    30x
    Payout
    Instant–1h · 48h pending
    Payments
    7.6/10★★★★★★★★★★
    Check the offerSlots-first, missions included

How to verify a provider claim in five minutes

Open the casino lobby and search for a title you know is made by the studio in question — a Pragmatic Play slot such as Gates of Olympus, or a NetEnt title such as Starburst. If it is there, the studio is present. Then open the game's information panel and note the RTP it states. That gives you two facts the marketing page cannot give you: that the provider really supplies the site, and what the deployed build actually returns.

If a studio is claimed but its games are missing, that is worth knowing before you deposit. If the games are present but the RTP is lower than you expected, only the paytable will tell you.

Claims versus inventory

A provider name in a marketing list is a claim, not a verification. The lobby and the in-game paytable are where the claim can be checked. If a studio you want is not in the lobby, the list was advertising rather than inventory.

Frequently Asked Questions

Do non-GamStop casinos use different slot providers?
Largely the same ones. Pragmatic Play, NetEnt, Play'n GO, Relax Gaming, Microgaming and Evolution supply both UK-licensed and offshore operators. The difference is the build: an offshore casino can deploy a title at an RTP configuration that a UK-licensed operator would have to disclose under Commission rules. The studio is usually familiar; the configuration is what changes.
What is Booming Games and is it on GamStop?
Booming Games is a slot studio, not a casino, so the question of GamStop does not apply to it directly — it supplies games to licensed operators. Whether you can play Booming titles outside GamStop depends on whether a given offshore casino carries them, which is answered by that casino's provider list and lobby, not by the studio.
Why does the same slot show a different RTP at different casinos?
Because RTP is set per build. A studio can certify a title at more than one return configuration, and the operator deploys the one its market allows. UK-licensed casinos must publish the RTP they actually run; offshore ones are bound by the paytable shown in the game. Two casinos running the same title can therefore return different amounts over time.
Which operator names the most providers?
GoldenBet is the most specific in this group, naming Pragmatic Play, Evolution, NetEnt, Play'n GO, Microgaming and Relax Gaming across a library of 3,000-plus titles from more than fifty providers. The rest state "multiple" and a library of roughly 4,000 titles. That is a difference in what is disclosed, which is not the same as a difference in what is available.
Does a named provider make a casino trustworthy?
No. A provider agreement is a commercial arrangement, not a guarantee of how the operator handles withdrawals, complaints or bonuses. It tells you the games are supplied by a real studio, which is useful and limited. The licence, the operating company and the published terms remain the things that decide whether the site is a reasonable place to deposit.