> ## 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 Serverless Inference service, including endpoints and authentication.

This reference describes the Serverless Inference REST API, which lets you call foundation models programmatically from your own applications. Use it to integrate hosted inference into services, scripts, or notebooks without managing model infrastructure.

## Base URL

Access the Inference service at:

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

## Prerequisites

To call the Inference API, 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'll also need team and project IDs. In code samples, these appear as `[YOUR-TEAM]/[YOUR-PROJECT]`. If you don't specify these, W\&B uses your default entity and the project name `inference`.

## Available methods

The Inference API provides OpenAI-compatible endpoints for interacting with foundation models. The following methods are available:

* **[Chat Completions](/inference/api-reference/chat-completions)**: Create chat completions using 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 the OpenAI SDK, set the `api_key` parameter.
* For direct API calls, use `Authorization: Bearer [YOUR-API-KEY]`.

## Error handling

For a complete list of error codes and how to resolve them, see [API errors](/support/inference).

## Next steps

After you have your API key, continue with one of the following:

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