> ## Documentation Index
> Fetch the complete documentation index at: https://docs.weflayr.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Cost: Cost per Feature
> Break your AI spend down per feature.
A feature is the `feature_name` you stamp on your LLM calls when [propagating metadata](/quickstart#add-metadata-to-your-llm-calls-for-finer-analysis) in your instrumentation.
PS: if a feature wraps several LLM calls, their costs are aggregated under that feature.
## Per-customer breakdown
Expand a feature row to see which customers drive that feature's cost:
## Feature detail
Click a feature to open its detail view: