[merlinnn]

The downside is that price per unit will increase as minimum unit size goes down. You're essentially buying at a "retail" price whereas the monthly bundle is wholesale.

But the tradeoff would be worth it for sparsely used applications.

[verdverm]

I pay $0.01 per MB on my phone data plan until I reach the unlimited plan value, then everything is free

I don't think you can guarantee that the price will go up. If I look at the API costs today, they do not have a sliding scale