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

# Arize AX

> Send traces to Arize AX

[Arize AX](https://arize.com) is an evaluation and observability platform developed by Arize; it offers tools for agent tracing, evals, prompt optimization, and more.

## Step 1: Get your Arize AX credentials

In Arize AX, navigate to your space settings to find your API key and space key:

1. Log in to your Arize AX account
2. Go to **Space Settings** to find your Space Key
3. Go to **API Keys** to create or copy your API key
4. Note the Project Name you want to use for organizing traces

## Step 2: Enable Broadcast in OpenRouter

Go to [Settings > Observability](https://openrouter.ai/settings/observability) and toggle **Enable Broadcast**.

<Frame>
  <img src="https://mintcdn.com/openrouter-d02e98a0/PSwwwiCqAD_BNeni/assets/guides/features/broadcast/arize/broadcast-enable.png?fit=max&auto=format&n=PSwwwiCqAD_BNeni&q=85&s=a48ecd5df85b4e6f3982c8402671f631" alt="Enable Broadcast" width="2692" height="1296" data-path="assets/guides/features/broadcast/arize/broadcast-enable.png" />
</Frame>

## Step 3: Configure Arize AX

Click the edit icon next to **Arize AX** and enter:

* **Api Key**: Your Arize AX API key
* **Space Key**: Your Arize AX space key
* **Project Name**: The name of the tracing project in Arize AX
* **Base Url** (optional): Default is `https://otlp.arize.com`

## Step 4: Test and save

Click **Test Connection** to verify the setup. The configuration only saves if the test passes.

## Step 5: Send a test trace

Make an API request through OpenRouter and view the trace in your Arize AX
dashboard under the specified project.

<Frame>
  <img src="https://mintcdn.com/openrouter-d02e98a0/PSwwwiCqAD_BNeni/assets/guides/features/broadcast/arize/broadcast-arize-trace.png?fit=max&auto=format&n=PSwwwiCqAD_BNeni&q=85&s=ee2f7a77436f592e546a33590c5a1c22" alt="Arize Trace View" width="3372" height="2064" data-path="assets/guides/features/broadcast/arize/broadcast-arize-trace.png" />
</Frame>

## Custom Metadata

Arize AX uses the [OpenInference](https://github.com/Arize-ai/openinference) semantic convention for tracing. Custom metadata from the `trace` field is sent as span attributes in the OTLP payload.

### Supported Metadata Keys

| Key               | Arize Mapping  | Description                                      |
| ----------------- | -------------- | ------------------------------------------------ |
| `trace_id`        | Trace ID       | Group multiple requests into a single trace      |
| `trace_name`      | Span Name      | Custom name for the root trace                   |
| `span_name`       | Span Name      | Name for intermediate spans in the hierarchy     |
| `generation_name` | Span Name      | Name for the LLM generation span                 |
| `parent_span_id`  | Parent Span ID | Link to an existing span in your trace hierarchy |

### Example

```json lines theme={null}
{
  "model": "openai/gpt-4o",
  "messages": [{ "role": "user", "content": "Classify this text..." }],
  "user": "user_12345",
  "session_id": "session_abc",
  "trace": {
    "trace_id": "classification_pipeline_001",
    "trace_name": "Text Classification",
    "generation_name": "Classify Sentiment",
    "dataset": "customer_feedback",
    "experiment_id": "exp_v3"
  }
}
```

### Additional Context

* Custom metadata keys from `trace` are included as span attributes under the `metadata.*` namespace
* The `user` field maps to user identification in span attributes
* The `session_id` field maps to session tracking in span attributes
* Token usage, costs, and model parameters are automatically included as OpenInference-compatible attributes

## Privacy Mode

When [Privacy Mode](/guides/features/broadcast#privacy-mode) is enabled for this destination, prompt and completion content is excluded from traces. All other trace data — token usage, costs, timing, model information, and custom metadata — is still sent normally. See [Privacy Mode](/guides/features/broadcast#privacy-mode) for details.