Usage-based pricing models require you to prove/measure the real usage, which may be really hard and possibly extra work. However, I personally prefer approach

Usage-based pricing models require you to prove/measure the real usage, which may be really hard and possibly extra work. However, I personally prefer approaches, where not every request gets charged but instead having "packages" with a discount on every step, e.g.: - 2000 Requests -> 2$ - 10000 Requests -> 8$ - 100000 Requests -> 15$ - unlimited Requests -> 69$ This way I also have a max. amount that won't ruin me, even if something goes wrong.