# Resource Management API introduction

The Resource Management API provides programmatic access to projects, user assignments, and more. The API implements standard HTTP REST operations that  you can call to create, read, update, and delete Resource Management resources.

> **Requirements:**
API access is only available on **Pro**, **Enterprise**, and **Business Resource Management** plans.
If you're on a **Trial** plan, you can contact [Support](https://help.smartsheet.com/contact) to request access.


## Base URL

Base URL: `https://api.rm.smartsheet.com/api/v1/`

## Authentication

The API uses tokens (API keys) to authenticate requests. If you have the Resourcing Administrator role, you can access your organization's token in the Resource Management application.

1. Select the kebab icon (three vertical dots) in the top-right of the application, and then select **Settings**. The settings panel appears.
2. On the left side, select the **Developer API** tab.
3. Copy your token from the token text field near the bottom of the panel.


The [Authentication](/api/resource_management/getting-started/authentication) article demonstrates how to apply your token in API operation requests.

## What's next?

- [Getting started](/api/resource_management/getting-started) (recommended) explains the fundamentals of using the API.
- [OpenAPI reference](/api/resource_management/openapi) lists operations and objects by resource, and provides a **Try it** interface to execute operations from right from within this site.