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

# Introduction

> Verify email addresses for validity, detect catchall domains, and more.

<img src="https://cdn.prod.website-files.com/67c07d3354a57537b7e69a3a/67cb962751959d471b7e3acb_Open%20Graph%20(7).png" alt="OmniVerifier API" />

## Welcome to OmniVerifier

The OmniVerifier API provides powerful email verification capabilities with a simple, RESTful interface.

<Card title="API Playground" icon="play" href="/api-reference/endpoint/valid">
  Try our interactive API playground to test endpoints directly in your browser
</Card>

## Authentication

All API endpoints require authentication using an API key. Include your API key in the `x-api-key` header with every request.

For example,

```bash theme={null}
curl -H "x-api-key: YOUR_API_KEY" \
     https://api.omniverifier.com/v1/validate/credits
```

<Note>
  You can get your API key from the [OmniVerifier Dashboard](https://app.omniverifier.com)
</Note>

## Response Format

All responses are returned in JSON format. Check the detailed documentation available for each endpoint for specific details.

For example:

```json theme={null}
{
  "results": [...],
  "processed": 3,
  "user_id": 2
}
```

## Getting Started

1. **Get your API key** from the [OmniVerifier Dashboard](https://app.omniverifier.com)
2. **Check your credits** using the Credits endpoint
3. **Start verifying** single emails or bulk email lists