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

# Overview

When implementing a usage-based plan on Salesbricks, your customers are charged based on the quantity / count used over a certain period, referred to as **Final value** in the UI.

## Counter / Final value

With **final value** measurement, tally up all billable events over a set time period. This approach is suitable for measuring cumulative usage, such as the total number of API calls in a month.

### Example

<Frame>
  <img src="https://mintcdn.com/salesbricks/YgX7xKXDNNE09RCl/api-reference/usage/images/final-value.png?fit=max&auto=format&n=YgX7xKXDNNE09RCl&q=85&s=e03dfa081c0a0b613df0646a4a4558a1" alt="final-value" width="786" height="243" data-path="api-reference/usage/images/final-value.png" />
</Frame>

Calculation is `sum(billable events) * unit price = total`.

In the illustrated graph,

(6 + 4 + 8 + 5 + 3) \* \$2 = \$52

### Use cases

<AccordionGroup>
  <Accordion title="API Usage">
    Number of API calls used in a month.
  </Accordion>

  <Accordion title="Exported Documents">
    Count of document exports by a customer.
  </Accordion>

  <Accordion title="Service Requests">
    Total service requests made by a client.
  </Accordion>
</AccordionGroup>

## Simple API Calls

Integrating usage data with Salesbricks requires just one simple API call:

`https://api.salesbricks.com/api/v2/usage`

Learn more about using your Public API token to authenticate API calls: [Authentication](/api-reference/getting-started/authentication)