> For the complete documentation index, see [llms.txt](https://docs.metasleuth.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.metasleuth.io/blocksec-aml-api/introduction/authentication.md).

# Authentication

Our API is authenticated using the API key. To ensure the security of your data, **please do not share your API key with anyone.**

### How to get the API Key?

To generate an API key, begin by [registering for a BlockSec account](https://account.blocksec.com/signup?referer=https%3A%2F%2Fmetasleuth.io). Once registered, access the [APIs](https://metasleuth.io/settings?type=apis) panel in the ***Settings*** section to quickly get your API key.

{% hint style="info" %}
If you subscribed to the customized API service through our sales channel, please get in touch with your designated service contact to acquire the API key.
{% endhint %}

<figure><img src="/files/csG8D76ObGwe0y9WM1M8" alt=""><figcaption></figcaption></figure>

### How to use the API Key

Include the "**API-KEY**" header in the HTTP Request Headers for each API request, and provide your API key as the value. See the following example.

{% code overflow="wrap" %}

```sh
curl -L \
  -X POST \
  -H 'Content-Type: application/json' \
  -H 'API-KEY:$API_KEY' \
  'https://aml.blocksec.com/address-label/api/v3/labels' \
  -d '{"chain_id":1,"address":"0x00d7e7409bfe09a736d3e993de9b87d0baa314d5"}'
```

{% endcode %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://docs.metasleuth.io/blocksec-aml-api/introduction/authentication.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.