> ## Documentation Index
> Fetch the complete documentation index at: https://aidocs.scope3.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Access and Authentication

Most of Scope3's APIs are restricted to customers with a valid API key. To obtain access, please contact your Scope3 representative. In the future, Scope3 will provide mechanisms for customers to manage their own API Access Tokens more easily.

# Access Tokens

Access tokens allow automated systems and applications to authenticate and access the Scope3 API. These tokens are generated by Scope3 and are of the format `scope3_accessClientId_accessClientSecret`.

Scope3 expects this value to be passed as HTTP headers on every request.

**Example HTTP Request**

```bash
curl --request POST 
     --url https://api.scope3.com/v2/measure 
     --header 'accept: application/json' 
     --header 'authorization: Bearer scope3_accessClientId_accessClientSecret'
     --header 'content-type: application/json' 
```