One of the undoubtfully powerful features of Backendless comparing with other popular mBAaS platforms is unlimited API calls for all Backendless apps.
That means any application can make as many API requests as it needs during a billing period, which is one month even if the app is on the free plan. This also means all of the calls could be spread out over time, but there may also be spikes of traffic - an increase of the number concurrent transactions handled by the backend.
The other mBaaS platforms limit an apps to XX requests/second or worse yet start charging you for increasing that XX number. An important distinction of Backendless is UNLIMITED number of the concurrent calls.
With Backendless a developer gets unlimited, un-throttled requests per second.
For more precise information as to this Backendless powerful advantage review the topic Unlimited API calls for all Backendless apps.