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

# Introduction

export const GradientHoverCard = ({children, direction = "vertical", title, iconName, href}) => <a className="gradient-hover-card-wrapper" href={href}>
    <div className="gradient-hover-card-inner">
      <div className="gradient-hover-card-inner__vertical-container">
        <img className="gradient-hover-card-inner_icon" src={`/image/${iconName}.svg`} />
        <p className="gradient-hover-card-title">{title}</p>
        <p className="gradient-hover-card-content">{children}</p>
      </div>
    </div>
  </a>;

## Base URL

<CodeGroup>
  ```bash Sandbox theme={null}
  https://api.sbx.hopnow.io
  ```

  ```bash Production theme={null}
  https://api.hopnow.io
  ```
</CodeGroup>

## Authentication

The HopNow API uses HMAC-based authentication. Every request must include:

* `X-API-Key` - The `api_key` value returned when the key is created
* `X-Signature` - HMAC-SHA256 signature
* `X-Timestamp` - Unix timestamp
* `X-Nonce` - Unique random token

See our [Authentication Guide](/fx/api-reference/authentication) for implementation details.

## Rate Limits

All HopNow API endpoints have a default rate limit of **10 requests per second (RPS)**. If you need higher limits, please [contact our support team](mailto:support@hopnow.io) to discuss increasing your quota.

## Next Steps

<div className="api-reference-introduction">
  <CardGroup cols={2}>
    <GradientHoverCard iconName="api-authentication" title="Authentication" href="/fx/api-reference/authentication">
      Set up HMAC authentication
    </GradientHoverCard>

    <GradientHoverCard iconName="api-idempotency" title="Idempotency" href="/fx/api-reference/idempotency">
      Prevent duplicate operations
    </GradientHoverCard>

    <GradientHoverCard iconName="api-errors" title="Errors" href="/fx/api-reference/errors">
      Handle API errors properly
    </GradientHoverCard>

    <GradientHoverCard iconName="api-pagination" title="Pagination" href="/fx/api-reference/pagination">
      Navigate through large datasets
    </GradientHoverCard>
  </CardGroup>
</div>