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

# TraceCostUsage

[**@ai-billing/narev**](https://www.narev.ai/docs/ai-billing/reference/narev/typedoc/index.md)

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[@ai-billing/narev](https://www.narev.ai/docs/ai-billing/reference/narev/typedoc/index.md) / TraceCostUsage

# Interface: TraceCostUsage

Defined in: packages/types/dist/index.d.ts:191

Token usage for a cost calculation request.

## Properties

### prompt\_tokens

> **prompt\_tokens**: `number`

Defined in: packages/types/dist/index.d.ts:192

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### completion\_tokens

> **completion\_tokens**: `number`

Defined in: packages/types/dist/index.d.ts:193

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### cache\_read\_tokens?

> `optional` **cache\_read\_tokens?**: `number`

Defined in: packages/types/dist/index.d.ts:194

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### cache\_write\_tokens?

> `optional` **cache\_write\_tokens?**: `number`

Defined in: packages/types/dist/index.d.ts:195

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### reasoning\_tokens?

> `optional` **reasoning\_tokens?**: `number`

Defined in: packages/types/dist/index.d.ts:196

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### web\_search\_count?

> `optional` **web\_search\_count?**: `number`

Defined in: packages/types/dist/index.d.ts:197


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