Online casino software is the full stack behind a casino site — front end, player accounts, wallet, cashier, game aggregation and back office — and it can be bought as a turnkey platform, a white label, or assembled from APIs.

What sits inside "casino software"

Front end: the casino site or app players use — lobby, game launcher, promos, cashbox.
Player accounts & auth: registration, KYC, session and device management.
Wallet & cashier: balances, deposits and withdrawals, multi-currency support, payment integrations.
Game layer: the integration that lists games, launches them and settles bets — the part an aggregator API replaces.
Back office: reporting (GGR, NGR, player activity), bonus engines, risk and responsible-gaming tools.
Most of this stack is generic engineering. The genuinely hard, licensed, certification-heavy part is the game layer — which is exactly the layer an aggregator API abstracts away.

Three ways to buy it

Turnkey platform: one vendor supplies nearly the whole stack. Fastest to market; you inherit the vendor's design, roadmap and per-month fees, and differentiation is limited.
White label: a full branded casino operated on the vendor's infrastructure — even lighter than turnkey, with correspondingly less ownership of player data and brand assets.
API-first assembly: you (or your agency) build the front end and cashier and plug in APIs for the game layer — the model behind GamingAPI. Highest control over brand, player data and economics; requires engineering capacity.

What each costs to run

Turnkey and white-label vendors typically charge a setup fee (often five figures), a monthly platform fee and a revenue share — the same three costs recurring. An API-first stack replaces the setup and platform fees with build cost plus a per-GGR game fee: no recurring platform licence, and the game layer only earns when you earn.

The crossover point is engineering: if you can build or buy a front end and wallet (or already have one), the API model is usually cheaper from month one. If you cannot, a white label gets you live faster — and you can still migrate to an API later once volume justifies it.

How GamingAPI fits

GamingAPI supplies the game layer as one REST API: 16,000+ games from 150+ studios, seamless wallet callbacks, multi-currency balances, agent and reseller panels, and round-level reporting — with $0 setup fee and go-live in 5–7 days. Everything above the game layer stays yours: your brand, your players, your payments, your data.