Casino API Explained: How Game Aggregators Work (2026)

TL;DR: A casino API is the connection that lets your site launch games and move bets and wins between the game and the player's balance. A game aggregator is a company that has already connected many studios and resells them through one casino API, so you integrate once and switch studios on from a back office. You still need a license or a licensed white label, a wallet that fits the aggregator's model, and games certified for each country you serve. The catalogue you see in a sales deck is the maximum, and your market decides how much of it you can use.

We run ads and SEO↗ for iGaming operators. We are not a platform provider and have not integrated or tested any product named here. Every statement about a company comes from its own site, read on 11 November 2026.

What is a casino API?

Every studio that makes slots or live tables hosts its own games. To put a game on your site, your platform has to open the game for a logged-in player and keep that player's balance correct while bets and wins happen. A slot API is a launch call plus a set of money calls.

One studio is manageable. With 50 studios you have 50 contracts and 50 integrations, which is why most new operators never go studio by studio.

What does a game aggregator do?

A casino game aggregator signs and integrates the studios itself, then exposes all of them through a single API. Hub88↗ sums up the pitch as "One API, one integration, fully self-serve".

Here is what five aggregators state on their own sites as of 11 November 2026. These are marketing figures, not audited counts.

Divide games by studios and the three vendors that publish both numbers land close together: about 167 titles per studio for SoftSwiss (50,000 ÷ 300), 133 for Slotegrator (20,000 ÷ 150) and 95 for St8 (21,000 ÷ 220). On that measure Slotegrator sits 20% below SoftSwiss and St8 43% below, while their headline catalogues are 60% and 58% smaller. The catalogues are built the same way: a few hundred studios, each contributing its full back list. A bigger headline number mostly means more studios signed. It says nothing about which titles your players will open.

Two details from reading the pages side by side: St8's home page says 220+ providers in one section and "200+" in its FAQ, so treat every count as approximate. And the quoted integration times run from 24 hours (Slotegrator) to 3 weeks (SoftSwiss). St8's page explains the gap better than either figure: it lists "wallet setup requirements" among the things that decide how long integration takes.

Single-wallet or transfer wallet: what is the difference?

• Single-wallet: the player's money stays in your platform. Each time the player bets or wins, the aggregator calls your server to debit or credit the balance. Your platform must answer every call correctly, including rollbacks when a round fails.
• Transfer wallet: the player moves money from the main balance into a separate balance held on the game side, plays, then moves it back. Your platform handles only the transfers in and out.

The single-wallet model gives players one balance across every game. It also makes your wallet part of every spin. If you are building your own platform, ask for the wallet API specification before you estimate development time. On a white label the provider has already done this work.

How do direct integration, an aggregator and a white label compare?

A first-time operator is usually choosing between the second and third columns. A white label generally gets its games through an aggregator too, so the real question is whether you want to own the platform and the license now or later. Our guide on how to start an online casino walks through that choice.

An aggregator does not replace a license. SoftSwiss says so in its FAQ: "operators need their own licensed online casino to use it".

What does game certification involve?

Regulators want proof that a game pays what it says and that its random number generator (RNG) is random. That proof comes from independent testing labs. iTech Labs↗ describes RNG testing as "source code evaluation, compilation to generate the raw RNG output, and testing the raw numbers". eCOGRA↗ states it is accredited "in 47 jurisdictions and counting". GLI↗ is a third; the EveryMatrix page shows a "Gaming Labs Certified" badge.

The rules differ by regulator. The Curaçao Gaming Authority↗ publishes its policy for test houses↗, version 1.0 dated 23 May 2025. A lab must hold ISO/IEC 17025 accreditation covering online gaming systems, RNGs, game fairness and return-to-player calculations, and its CGA certificate runs for up to 3 years. The policy also says that "the CGA has not established its own technical standards" and accepts those of New Jersey, Pennsylvania, Ontario, British Columbia, the United Kingdom and Malta.

A certificate is tied to a standard, and the CGA list above shows that standards are set per jurisdiction. So when an aggregator says its content is "certified", ask by which lab, against which standard, and for which of your markets. License costs are a separate line; see our Curaçao gaming license cost breakdown.

Why are some games missing in my country?

Three parties can each remove a game from your lobby. The studio decides which countries it will serve at all. The regulator in a licensed market decides which certified versions are allowed. And the aggregator holds approvals in some markets only: SoftSwiss states "25+" supported regulated markets, while St8's FAQ names 12 jurisdictions, from the UK to Georgia.

So the same aggregator contract produces a different lobby in Brazil than in Estonia. Ask for the game list filtered by your target country and your license before you compare vendors.

What should you ask a casino API provider before signing?

• Which wallet model do you support, and can I see the API documentation before the contract?
• Which studios need a separate agreement?
• What is the game list for my license and my top 3 countries, as an export?
• Which lab certified the games, and against which standards?
• How are fees calculated, and is there a monthly minimum?

We add one question of our own. Ask whether you may use game names, logos and artwork in ads and on landing pages. A page built around a game you cannot show, or cannot offer in that country, wastes the click. The catalogue should shape the acquisition plan, and that planning is what we do in iGaming acquisition at RedClaw.

Need a platform or aggregator that fits your market? Tell us your country, license status and budget, and we will introduce you to a provider. The introduction is free for you; a provider may pay us a referral fee.

FAQ

What is the difference between a casino API provider and a game studio?

A studio offers an API for its own titles. A casino API provider, or aggregator, connects many studios and resells them through one integration.

How many games does a casino games aggregator offer?

On 11 November 2026 the sites we read stated 50,000+ (SoftSwiss), 26,000+ (Hub88), 21,000+ (St8) and 20,000+ (Slotegrator). What you can use depends on your license and countries.

Do I need a license to use a game aggregator?

Yes, your own or a white label provider's. SoftSwiss, for one, states that operators need their own licensed online casino to use its aggregator.

How long does a slot API integration take?

Vendor claims range from 24 hours (Slotegrator) to 3 weeks (SoftSwiss). St8 lists wallet setup among the factors that decide it.

This article summarizes what the companies and regulators named publish on their own sites. It is not legal or technical advice. Gambling is restricted or prohibited in many countries, and a game being available through an aggregator does not make it legal to offer where your players are.

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