# Authentication
The Mattermix API is expecting an [Authorization](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Authorization) header using the Bearer authentication scheme followed by your API key as the authorization parameter. For example, an authorization header would look like the following (replacing `Your-API-Key` with your actual API key): `Authorization: 'Bearer Your-API-Key'`.
Below is an example using the Fetch API from JavaScript:
```javascript
const body = {
html: "Hello World!
"
}
const res = await fetch("mattermix.com/api/v1/image", {
method: "POST",
headers: {
"Content-Type": "application/json",
Authorization: `Bearer ${process.env.MATTERMIX_API_KEY}`
},
body: JSON.stringify(body)
});
```
In the above example, the Mattermix API key is stored in an [environment variable](https://www.freecodecamp.org/news/what-are-environment-variables-and-how-can-i-use-them-with-gatsby-and-netlify/) named `MATTERMIX_API_KEY` to prevent the API key being exposed in committed code.
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://docs.mattermix.com/api/authentication.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.