---
headline: Overview | Opik Documentation
og:description: Explore the Opik REST API to integrate seamlessly with Open-Source
  and Opik Cloud platforms. Engage with our community for support.
og:site_name: Opik Documentation
og:title: Overview of the Opik REST API
title: Overview
canonical-url: https://www.comet.com/docs/opik/reference/rest-api/overview
---

The Rest API can be used with both the Open-Source platform and Opik Cloud. The main differences are related to the URL
to use and request headers used for authentication.

<Tabs>
    <Tab title="Open-Source">
    If you are using the Open-Source platform you can simply use the `http://localhost:5173/api/v1/<endpoint_path>`:

    ```bash
    curl -X GET 'http://localhost:5173/api/v1/private/projects'
    ```

    </Tab>
    <Tab title="Opik Cloud">
    If you are using Opik Cloud or a on-premise installation of the Comet platform, you will need to specify the Opik
    API Key and Opik Workspace in the header:

    ```bash
    curl -X GET 'https://www.comet.com/opik/api/v1/private/projects' \
    -H 'Accept: application/json' \
    -H 'Comet-Workspace: <your-workspace-name>' \
    -H 'authorization: <your-api-key>'
    ```

    <Warning>
    Note that the authorization header value does not include the `Bearer ` prefix.
    </Warning>
    </Tab>

</Tabs>