> ## 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.

# Compound Aggregation Endpoints

> Endpoints for Compound Aggregation related operations such as creation, update, list and delete.

Use Compound Aggregations to create numerical measures from usage data by applying a calculation to one or more simple Aggregations or Custom Fields. These numerical measures can then be used as pricing metrics to price your Product Plans, enabling you to implement a wide range of usage-based pricing use cases.

## Types of Compound Aggregation

You can create two types of Compound Aggregation:

### Global

* Pricing: Not tied to any specific product and can be used to price Plans belonging to any Product.
* Calculation: can reference all simple Aggregations - both Global simple Aggregations and any product-specific simple Aggregations.

### Product-specific

* Pricing: belong to a specific Product and can only be used to price Plans belonging to the same Product.
* Calculation: can reference any simple Aggregations belonging to the same Product and any Global simple Aggregations.

<Warning>
  **Notes and Warnings:**

  * **Compound Aggregations based on Segmented Aggregations?** You can use Compound Aggregations that reference Segmented Aggregations to price Plans. However, the segments made available to the Compound Aggregation for pricing a Plan will depend on whether a single or multiple Segmented Aggregations are referenced. See [Pricing with Compound Aggregations Based on Segmented Aggregations](https://docs.m3ter.com/guides/plans-and-pricing/pricing-plans/pricing-plans-using-segmented-aggregations#pricing-with-compound-aggregations-based-on-segmented-aggregations) for details. Any segments made available to a Compound Aggregation will be listed for the `segments` response parameter.
  * **Warning!** If a simple Aggregation referenced by a Compound Aggregation has a **Quantity per unit** defined or a **Rounding** defined, these will not be factored into the value used by the calculation. For example, if the simple Aggregation referenced has a base value of 100 and has **Quantity per unit** set at 10, the Compound Aggregation calculation *will use the base value of 100 not 10*.
</Warning>

To better understand and use Compound Aggregations, refer to the example [Compound Aggregation Use Case](https://docs.m3ter.com/guides/usage-data-aggregations/compound-aggregations#example-use-case).