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

# Overview

> REST API for searching 10B+ leaked records — emails, usernames, phones, domains and info-stealer logs.

The LeakCheck API lets you check whether an identifier — an email address,
username, phone number, domain or password hash — appears in known data
breaches and info-stealer logs.

There are two APIs:

* **Pro API v2** — authenticated with an API key. Returns full breach records
  (including passwords and all leaked fields), supports every search type and
  pagination. Available on paid plans.
* **Public API** — no authentication required. Returns only the list of
  breach sources and the categories of exposed data, never the data itself.
  Free, including commercial use.

## Pro API vs Public API

|                                 | Pro API v2          | Public API |
| ------------------------------- | ------------------- | ---------- |
| Search by e-mail, username      | ✅                   | ✅          |
| Sources display                 | ✅                   | ✅          |
| Passwords display               | ✅                   | ❌          |
| Full data exposure              | ✅                   | ❌          |
| Allowed RPS                     | 3 (upgradeable)     | 1          |
| Search by password, domain name | ✅ (from Enterprise) | ❌          |
| Pricing                         | from \$9.99/mo      | free       |

## Base URLs

```text theme={null}
Pro API v2:  https://leakcheck.io/api/v2
Public API:  https://leakcheck.io/api/public
```

## Quick start

<CodeGroup>
  ```bash Pro API v2 theme={null}
  curl "https://leakcheck.io/api/v2/query/example@example.com" \
    -H "Accept: application/json" \
    -H "X-API-Key: $LEAKCHECK_APIKEY"
  ```

  ```bash Public API theme={null}
  curl "https://leakcheck.io/api/public?check=example@example.com"
  ```

  ```python Python (wrapper) theme={null}
  from leakcheck import LeakCheckAPI_v2

  api = LeakCheckAPI_v2(api_key="your_api_key_here")
  result = api.lookup(query="example@example.com")
  print(result)
  ```
</CodeGroup>

<CardGroup cols={2}>
  <Card title="Pro API v2 lookup" icon="magnifying-glass" href="/pro-api/lookup">
    The main query endpoint: request, response and pagination.
  </Card>

  <Card title="Search types" icon="filter" href="/pro-api/search-types">
    Everything you can search by, from emails to info-stealer origins.
  </Card>

  <Card title="Public API" icon="globe" href="/public-api/lookup">
    Free breach-source lookups without an API key.
  </Card>

  <Card title="Python wrapper & CLI" icon="python" href="/tools/python-wrapper">
    Official `leakcheck` package on PyPI, with a CLI tool included.
  </Card>
</CardGroup>

## Commercial usage

You are free to use the Public API for commercial purposes — the only
requirement is a "Powered by LeakCheck" link on your website (see
[Public API terms](/public-api/lookup#terms-and-conditions)).

If you wish to use the Pro API commercially, please contact our support team
at [the@leakcheck.net](mailto:the@leakcheck.net) and describe your project.