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

# Introduction

> Reverse lookup allows you to find the person behind an email address

## How it works

<Steps>
  <Step title="Start a search">
    Send an email via `POST /reverse-contact/single` to initiate the search.
  </Step>

  <Step title="Retrieve the result">
    Use the returned ID with `GET /reverse-contact/single` to get the profile.
  </Step>
</Steps>

## Authentication

All requests require an API key in the header:

```bash theme={null}
x-api-key: your_api_key
```

<Card title="Get an API key" icon="key" href="https://app.reverselooker.com">
  Create an account on Reverse Looker to get your API key.
</Card>

## Pricing

| Operation     | Cost               |
| ------------- | ------------------ |
| Single search | 50 credits         |
| Bulk search   | 50 credits / email |

## Qualifications

Each search returns a qualification:

| Qualification | Description                     |
| ------------- | ------------------------------- |
| `ongoing`     | Search in progress              |
| `found`       | Profile found                   |
| `not_found`   | No profile found for this email |

## Base URL

```
https://api.reverselooker.com
```