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

# Introduction

> View the HTTP-specific API reference for the Email API.

This section provides in-depth information about the Email API. If you're new to the API, consider starting with the
[Get Started](/email-api/curl/quickstart) guide, or [send vs send async](/email-api/send-vs-send-async).

## Base URL

The base URL for API requests is `https://api.mailchannels.net/tx/v1`. All requests are made to this URL, and must use
HTTPS.

## Authentication

All requests to the Email API must contain the `X-Api-Key` header with your API key as the value. See the
[Authentication](/email-api/authentication) section for more information about API keys and how to manage them.

## Troubleshooting

For HTTP status codes and error responses, see the [Errors](/email-api/errors) section of the API reference.