> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gr4vy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Agentic Development Kit (ADK)

> Build AI-native storefronts within conversational AI platforms using Gr4vy.

The Agentic Development Kit (ADK) gives merchants a practical way to make their products purchasable directly inside AI platforms—without rebuilding their existing payment infrastructure. Built on the [Model Context Protocol](https://modelcontextprotocol.io) (MCP), the ADK enables embedded shopping and checkout experiences within conversational interfaces, with Gr4vy handling payment orchestration through a single API.

## Supported platforms

<CardGroup cols={2}>
  <Card title="ChatGPT" icon="message-bot" href="/guides/payments/chatgpt-app/overview">
    Build an AI-native storefront inside ChatGPT. Let customers browse
    products, manage a cart, and check out with Gr4vy Embed—all within a
    conversation.
  </Card>

  <Card title="Gemini" icon="sparkles">
    Coming soon. Build an AI-native storefront inside Google Gemini.
  </Card>
</CardGroup>

## How it works

Each ADK integration follows the same pattern:

1. **MCP server:** Your server exposes tools (actions the AI can invoke) and resources (UI widgets it can embed) over the Model Context Protocol.
2. **Widgets:** Self-contained HTML widgets render inside the AI platform as inline frames, giving you full control over the shopping experience.
3. **Gr4vy Embed:** A PCI-compliant payment form loads inside the checkout widget, backed by Gr4vy orchestration, real-time routing, and webhook verification.
4. **Single API:** Once live, your storefront connects to Gr4vy through a single integration, giving you access to 400+ payment methods and PSPs using your existing payment stack.

## Reference implementations

<CardGroup cols={2}>
  <Card title="ChatGPT - TypeScript" icon="node-js" href="https://github.com/gr4vy/gr4vy-typescript-adk">
    Reference implementation using Node.js, Express, React, and the MCP SDK.
  </Card>

  <Card title="ChatGPT - Python" icon="python" href="https://github.com/gr4vy/gr4vy-python-adk">
    Reference implementation using Python and FastMCP.
  </Card>
</CardGroup>