Pay As You Go: adjustable usage cap

Adjustable usage cap allows your customers to define spend limits on their own, picking the maximum number of API calls they can make in a billing period.

This is useful, when you'd like to offer a Pay As You Go Product and protect your customers from unexpected overages due to a mistake in their application's code, for instance.

With Project X, it's extremely simple to configure adjustable spend limits, and this video demonstrates the whole process.