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

# API Overview

> Explore the complete REST API reference for the W&B Inference service, including endpoints and authentication.

Learn how to use the W\&B Inference API to access foundation models programmatically.

## Base URL

Access the Inference service at:

```plaintext theme={null}
https://api.inference.wandb.ai/v1
```

<Note>
  **Important**

  To use this endpoint, you need:

  * A W\&B account with Inference credits
  * A valid W\&B API key

  If you belong to more than one team or want to attribute your usage to a project you will also need team and project IDs. In code samples, these appear as `<your-team>/<your-project>`. Your default entity and the project name `inference` will be used if unspecified.
</Note>

## Available methods

The W\&B Inference API provides OpenAI-compatible endpoints for interacting with foundation models:

* **[Chat Completions](/inference/api-reference/chat-completions)** - Create chat completions using various foundation models
* **[List Models](/inference/api-reference/list-models)** - Get all available models and their IDs

## Authentication

All API requests require authentication using your W\&B API key. Create an API key at [wandb.ai/settings](https://wandb.ai/settings).

Include your API key in the request headers:

* For OpenAI SDK: Set as `api_key` parameter
* For direct API calls: Use `Authorization: Bearer <your-api-key>`

## Error handling

See [API Errors](/support/inference) for a complete list of error codes and how to resolve them.

## Next steps

* Try the [usage examples](/inference/examples) to see the API in action
* Explore models in the [UI](/inference/ui-guide)
* Check [usage limits](/inference/usage-limits) for your account