Casino API glossary — the terms operators actually get billed on

GGR (gross gaming revenue) is the total amount players wagered minus the total amount they won back — the headline revenue line for every casino and the base most casino API billing is calculated on.

RTP (return to player) is the percentage of all wagered money a game is mathematically designed to pay back to players over time — a 96% RTP slot returns ৳96 of every ৳100 bet in the long run.

An RNG (random number generator) is the certified software that produces unpredictable game outcomes — every slot spin, card draw and crash-game multiplier starts with a number the RNG generates.

Provably fair is a verification method where a game publishes a hash of its outcome before the round and lets the player recompute it afterwards — proving the result was not changed after the bet.

The house edge is the mathematical percentage of each bet the game is designed to keep for the house over time — 100% minus RTP, and the reason casino revenue trends positive across enough rounds.

A sportsbook is the betting platform where players wager on sports outcomes — odds, markets, bet slips and settlement — and modern sportsbooks are increasingly sold as APIs attached to an existing casino stack.

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.

A retail betting client is the terminal software used in physical betting shops — it displays live odds, prints or records bets, and settles tickets against the same odds feed and risk system an online sportsbook uses.