# Introduction

This section contains the API specification, including all calls that the dApp can make to interact with sign in requests and transaction requests.

During the reading, you are likely to encounter certain calls that have a :unlock: icon. These refer to calls that need to provide the authentication explained in the following document.

The specification is separated into the following sections:

* [**Authentication**](/api/authentication.md): Security mechanism to interact with the API.
* [**Requests**](/api/requests.md): Sign in and transaction request specification.
* [**Polling**](/api/polling.md): Resource for dApps.

{% hint style="info" %}
All API calls specified in this section must be made to the host **console.ckbull.app**
{% endhint %}


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