# How can so many different features all be priced with the same metric?

GB gives every workflow a common unit, while each Robot adjusts how much usage counts to reflect the infrastructure it needs.

* Most processing Robots count the combined input and output file sizes.
* Lightweight Robots have built-in discounts. For example, many import and export Robots count only 10% of the bytes they handle, while some Robots are free.
* Resource-intensive Robots can have a minimum charge per operation. This accounts for fixed compute or provider costs even when the input file is very small.

This keeps pricing comparable across image, video, audio, document, storage, and AI workflows without pretending that every operation costs the same amount. Every Robot’s discount and minimum charge is listed on the [Robot pricing page](/docs/robots/pricing.md).