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

# Introduction

This API lets merchants automate key CryptoProcessing operations, such as listing account balances, retrieving supported currencies and exchange rates, generating deposit addresses, making withdrawals, creating invoices, performing exchanges, and accessing transaction data.

<Columns cols={2}>
  <Card title="Get your API key" icon="badge-check" href="/merchant-administration/generate-and-activate-api-keys">
    Generate the credentials required for authenticated API access.
  </Card>

  <Card title="Authentication" icon="key" href="/api-reference/authentication">
    Learn how to authenticate requests with your API key and signature.
  </Card>

  <Card title="Whitelist IP addresses" icon="list-check" href="/merchant-administration/manage-allowed-ip-addresses-for-api-requests">
    Specify the IP address that will be allowed to make API requests.
  </Card>

  <Card title="Test with Postman" icon="rocket" href="/api-reference/postman-collection">
    Explore and test the API faster with the ready-to-use Postman collection.
  </Card>
</Columns>

## Base URLs

The production API uses the following base URL:

```text theme={null}
https://app.lt.cryptoprocessing.com/api/v2
```

A separate sandbox environment is also available for testing before going live:

```text theme={null}
https://app.sandbox.cryptoprocessing.com/api/v2
```