> ## Documentation Index
> Fetch the complete documentation index at: https://docs.flexprice.io/llms.txt
> Use this file to discover all available pages before exploring further.
# Volume tiered
In Flexprice, the **Volume-Tiered** model allows you to define multiple pricing tiers, where a single unit price is applied based on the total volume of usage. This means that the unit price is determined by the highest tier reached by the customer's total consumption.
**Example:**
Consider the following pricing tiers for an API service:
| Tier | Usage Range (API Calls) | Unit Price (\$) |
| ---------- | ----------------------- | --------------- |
| **Tier 1** | 0 – 10,000 | 0.0010 |
| **Tier 2** | 10,001 – 50,000 | 0.0008 |
| **Tier 3** | 50,001 – 100,000 | 0.0006 |
| **Tier 4** | 100,001 and above | 0.0004 |
If a customer makes **65,000 API calls** in a billing period, their total usage falls within **Tier 3** (50,001 – 100,000 calls) with a unit price of **\$0.0006**. The total charge would be:
`65,000 API calls × $0.0006 = $39`
This model ensures that customers are charged a consistent rate for all units based on their total usage volume, which can either increase or decrease depending on the defined tiers.
