> ## Documentation Index
> Fetch the complete documentation index at: https://docs.m3ter.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Aggregation Endpoints

> Endpoints for listing, creating, updating, retrieving, or deleting Aggregations.

An Aggregation links to a Meter and targets a Data Field or Derived Field on the Meter. You define the method of aggregation used to convert the usage data collected by the targeted Meter field into a numerical unit of measurement.

You can then use the unit of measurement an Aggregation yields as a metric for pricing Product Plans and apply usage-based pricing to your products and services. You might also want to aggregate raw data measures for other purposes, such as to feed into analytical or business performance tools.

## Notes

* **Contrast with Compound Aggregations**. Standard or simple Aggregations of this type, which apply an aggregation method directly to Meter usage data fields, are contrasted with [Compound Aggregations](/api/compoundaggregation/introduction). A Compound Aggregation typically references one or more simple Aggregations and applies a calculation to them to derive pricing metrics needed to serve more complex usage-based pricing scenarios.
* **Segmented Aggregations**. Segmented Aggregations allow you to segment the usage data collected by a single Meter. This capability is very useful for implementing some pricing and billing use cases. See [Segmented Aggregations](/guides/usage-data-aggregations/segmented-aggregations) in our main documentation for more details.