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

# REST APIs

export const LwTemplate = ({title = "Key questions to get you started", icon = "sparkles", cta = "Powered by Agent Studio", linkHref = "https://lucidworks.com/demo/?utm_source=docs&utm_medium=referral&utm_campaign=docs_cta_ai"}) => {
  const [isLoaded, setIsLoaded] = useState(false);
  useEffect(() => {
    const timer = setTimeout(() => {
      setIsLoaded(true);
    }, 500);
    return () => clearTimeout(timer);
  }, []);
  return <div className="lw-template-container">
      <Card title={title} icon={icon}>
        {isLoaded && <span dangerouslySetInnerHTML={{
    __html: `<lw-template id="a029c1a9-28be-427e-b0e1-5d918920246a"></lw-template
            >`
  }} />}
        <Link href={linkHref} className="agent-studio-link text-left text-gray-600 gap-2 dark:text-gray-400 text-sm font-medium flex flex-row items-center hover:text-primary dark:hover:text-primary-light group-hover:text-primary group-hover:dark:text-primary-light">Powered by Lucidworks Agent Studio</Link>
      </Card>
    </div>;
};

[localhost link]: http://localhost:3000/docs/4/fusion-ai/reference/api/overview

[mintlify link]: https://doc.lucidworks.com/docs/4/fusion-ai/reference/api/overview

[old doc.lw link]: https://doc.lucidworks.com/fusion-ai/4.2/550

Fusion API services are designed to be accessed via Fusion’s authentication proxy module which is part of the Fusion UI service (default port 8764). All applications should use this method to access the API service:

```sh wrap  theme={"dark"}
https://FUSION_HOST:8764/api/<endpoint>
```

<LwTemplate />

## List all Fusion component services

The Fusion `introspect` endpoint lists basic information about endpoints and parameters for all Fusion endpoints,
including the Connectors services endpoints:

```bash wrap  theme={"dark"}
curl -u USERNAME:PASSWORD https://FUSION_HOST:8764/api/introspect
```

## REST API Reference Pages

* [Experiments API](/docs/4/fusion-ai/reference/api/experiments-api)
* [Recommendations API](/docs/4/fusion-ai/reference/api/recommendations-api)
  (Deprecated)
* [Signals API](/docs/4/fusion-ai/reference/api/signals-api)