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

# Cost Tracking

> How Muster tracks and attributes AI costs across your organisation.

Muster tracks AI spend at the job level and aggregates it by agent, department, and model.

## How costs are tracked

Send token usage with each quality signal:

```python theme={null}
quality.emit(
    job_id=job_id,
    token_input=1247,
    token_output=312,
    model="gpt-4o",
    provider="openai",
    checks=[...]
)
```

Muster looks up the current per-token pricing for the model/provider combination and calculates the cost in USD. Costs are converted to your display currency using daily exchange rates.

## Cost dashboard

The Cost Dashboard shows:

* **30-day total spend** across all agents
* **Daily trend chart** — spot spending spikes
* **Department breakdown** — compare Finance vs Legal vs Operations
* **Top agents by spend** — identify your biggest cost drivers
* **Unattributed spend** — jobs with no agent\_id

## Duplicate agents

When two agents do the same job, Muster's similarity engine detects them and flags them as a **duplicate pair**. The combined cost of both agents is shown — merging them is the recommended optimisation.

## Model pricing

Pricing data is stored in the database and updated regularly. You can also manually update pricing via **Settings → Model Pricing** or the API if you have negotiated rates.

## Currency support

Muster supports display in any currency. Set your display currency in **Settings → Instance**. Exchange rates are fetched daily from BNM (Malaysia), Bank Indonesia, and ECB.