# BillingPlanUnitPriceTier

> Billing is currently in Beta and its APIs are experimental and may undergo breaking changes. To mitigate potential disruptions, we recommend [pinning](https://clerk.com/docs/pinning.md?sdk=chrome-extension) your SDK and `clerk-js` package versions.

The `BillingPlanUnitPriceTier` type represents a single pricing tier for a unit type on a plan.

## Properties

| Property                                     | Type                                                                                                  | Description                                                   |
| -------------------------------------------- | ----------------------------------------------------------------------------------------------------- | ------------------------------------------------------------- |
| <a id="endsafterblock"></a> `endsAfterBlock` | `null | number`                                                                            | The final block this tier applies to. `null` means unlimited. |
| <a id="feeperblock"></a> `feePerBlock`       | [BillingMoneyAmount](https://clerk.com/docs/chrome-extension/reference/types/billing-money-amount.md) | The fee charged for each block in this tier.                  |
| <a id="id"></a> `id`                         | `string`                                                                                              | The unique identifier of the unit price tier.                 |
| <a id="startsatblock"></a> `startsAtBlock`   | `number`                                                                                              | The first block number this tier applies to.                  |

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