# Price tiers

Price tiers let you segment the pricing of your products by defining specific intervals where the unit price of the associated SKU stays the same (changing when each interval's upper limit is exceeded).

At the moment [volume tiers](https://docs.commercelayer.io/core-api-reference/price_volume_tiers) and [frequency tiers](https://docs.commercelayer.io/core-api-reference/price_frequency_tiers) are available for prices (more to come).

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A maximum of **10 tiers in total per price** are currently allowed, no matter what type.
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<details>

<summary>Data model</summary>

Check the related [ER diagram](https://commercelayer.io/docs/data-model/price-lists-and-currencies) and explore the flowchart that illustrates how the price tier resource relates to the other API entities.

</details>

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This is an **immutable API**, meaning that create, update, and delete operations are not allowed on this endpoint. You can only fetch a list of price tiers or a single price tier object. For the full set of available CRUD actions to the specific price tier type endpoints.
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