Comment by esafak

I think you are swimming adjacent to usage-based pricing products like stigg. They also keep track of usage, and though their focus is not on what it costs you, that follows readily from usage.

Are you thinking of expanding in that direction, or integrating with such products? I would look favorably at a product that combined pricing (them) and observability (you). You're solving basically the same problem; don't make me buy two products.