> For the complete documentation index, see [llms.txt](https://docs.altum.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.altum.ai/english/sustainability/sustainability-api/api-key-information.md).

# API Key Information

Understanding and Obtaining Your API Key

An API key is a unique identifier that allows you to access Altum AI’s APIs securely. It’s required in the `x-api-key` header for all API requests to ensure proper authentication.

**How to Get Your API Key**\
You can obtain your API key in one of two ways:

1. **Via the Platform**: Generate your API key directly on the Altum AI platform.
2. **By Subscribing**: An API key will be provided when you subscribe to the **Startup plan** or **Unlimited plan**.

**Where to Use Your API Key**\
Include the API key in the `x-api-key` header of every API request. Without a valid key, your request will not be authenticated.

**Example Header**:

```plaintext
x-api-key: YOUR_UNIQUE_API_KEY
```

**Security Note**\
Keep your API key confidential to prevent unauthorized access to your account.


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