Most aggregator comparisons are written for the commercial director. This one is for the engineer who will actually build the integration. It rewards what can be checked before signing: documentation, keys, wallet contracts and bonus endpoints.
Why Hub88 leads
Hub88 is the only company in this list to publish two wallet models and a dedicated free-bets API alongside a public knowledge base. A team can understand most of the integration without a meeting.
SoftAggregator’s place
SoftAggregator’s self-service sign-up and same-day keys mean a developer can be making calls the day the project starts. It ranks second, behind Hub88, whose Freebets API some operators need from day one.
The sales-led group
SOFTSWISS and EveryMatrix publish solid integration claims but keep keys behind a contract. That is not a technical weakness, but it slows the first week.
Frequently asked questions
What should a developer check first in a casino aggregator API?
The wallet contract: which calls the aggregator makes to your server, how retries and rollbacks work, and whether a transfer model is available.
Which aggregators let developers get keys without a sales call?
SoftAggregator and Aggregator.gg both offer self-service sign-up with API keys straight away.
Which aggregator APIs include free spins endpoints?
Hub88 publishes a Freebets API and St8 a Bonus API.
Is a seamless wallet always required?
No. Hub88, for example, also offers a TransferWallet model. Seamless is the more common pattern.