# Arize Phoenix
[EN] Source: https://mastra.ai/reference/observability/otel-tracing/providers/arize-phoenix

Arize Phoenix is an open-source AI observability platform designed for monitoring, evaluating, and improving LLM applications. It can be self-hosted or used via Phoenix Cloud.

## Configuration

### Phoenix Cloud

If you're using Phoenix Cloud, configure these environment variables:

```env
PHOENIX_API_KEY="your-phoenix-api-key"
PHOENIX_COLLECTOR_ENDPOINT="your-phoenix-hostname"
```

#### Getting Your Credentials

1. Sign up for an Arize Phoenix account at [app.phoenix.arize.com](https://app.phoenix.arize.com/login)
2. Grab your API key from the Keys option on the left bar
3. Note your Phoenix hostname for the collector endpoint

### Self-Hosted Phoenix

If you're running a self-hosted Phoenix instance, configure:

```env
PHOENIX_COLLECTOR_ENDPOINT="http://localhost:6006"