> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lt.cryptoprocessing.com/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. It is available at the base URL below, alongside a sandbox environment for testing:

<CodeGroup>
  ```text Production theme={null}
  https://app.lt.cryptoprocessing.com/api
  ```

  ```text Sandbox theme={null}
  https://app.sandbox.cryptoprocessing.com/api
  ```
</CodeGroup>

<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="Set up callback URL" icon="webhook" href="/merchant-administration/set-up-callback-url">
    Register an HTTPS webhook endpoint to receive callbacks about deposits, withdrawals, and other events.
  </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>