> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter.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**.

![Enable Broadcast](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)

## 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.

![Arize Trace View](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)

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