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

# TraceCostUsage

[**@ai-billing/narev**](../index)

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[@ai-billing/narev](/docs/sdk/ai-billing/reference/narev/typedoc/index) / TraceCostUsage

# Interface: TraceCostUsage

Defined in: packages/types/dist/index.d.ts:245

Token usage for a cost calculation request.

## Properties

### prompt\_tokens

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

Defined in: packages/types/dist/index.d.ts:246

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### completion\_tokens

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

Defined in: packages/types/dist/index.d.ts:247

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### cache\_read\_tokens?

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

Defined in: packages/types/dist/index.d.ts:248

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### cache\_write\_tokens?

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

Defined in: packages/types/dist/index.d.ts:249

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### reasoning\_tokens?

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

Defined in: packages/types/dist/index.d.ts:250

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### web\_search\_count?

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

Defined in: packages/types/dist/index.d.ts:251