app.py

"""
Nory x402 - Payment Infrastructure for AI Agents

Interactive demo showing how AI agents can pay for APIs using the x402 protocol.
"""

import gradio as gr
import requests
import json

# Nory API base URL
NORY_BASE = "https://noryx402.com"

def get_payment_requirements(endpoint: str, amount: str):
    """Get x402 payment requirements for an endpoint"""
    try:
        response = requests.get(
            f"{NORY_BASE}/api/x402/requirements",
            params={"resource": endpoint, "amount": amount}
        )
        if response.status_code == 200:
            return json.dumps(response.json(), indent=2)
        return f"Error: {response.status_code} - {response.text}"
    except Exception as e:
        return f"Error: {str(e)}"

def test_paid_api(api_choice: str, param_value: str):
    """Test a paid API (returns 402 without payment)"""
    endpoints = {
        "Crypto Prices": f"/api/paid/live-crypto?symbols={param_value or 'BTC,ETH,SOL'}",
        "Weather": f"/api/paid/weather?city={param_value or 'London'}",
        "QR Code": f"/api/paid/qr-code?data={param_value or 'https://noryx402.com'}&format=json",
        "Web Summary": f"/api/paid/web-summary?url={param_value or 'https://example.com'}",
        "Translate": f"/api/paid/translate?text={param_value or 'Hello world'}&to=es",
        "Mock Data": f"/api/paid/mock-data?type=users&count={param_value or '3'}"
    }

    endpoint = endpoints.get(api_choice, endpoints["Crypto Prices"])

    try:
        response = requests.get(f"{NORY_BASE}{endpoint}")

        if response.status_code == 402:
            # Parse the x402 payment requirements
            requirements = response.json()
            return f"""## 402 Payment Required

The API returned HTTP 402 - payment is required to access this resource.

### Payment Requirements:
```json
{json.dumps(requirements, indent=2)}
```

### How an AI Agent Handles This:

1. **Parse requirements** - Extract amount, wallet address, and network
2. **Create payment** - Sign a USDC transfer transaction
3. **Retry request** - Include `X-PAYMENT` header with signed transaction
4. **Get data** - Server verifies payment, returns data

### With nory-x402-payer SDK:
```javascript
import {{ NoryPayer }} from 'nory-x402-payer';

const payer = new NoryPayer({{ privateKey: 'your-key' }});
const data = await payer.fetch('{NORY_BASE}{endpoint}');
// Payment handled automatically!
```
"""
        elif response.status_code == 200:
            return f"""## Success (200 OK)

```json
{json.dumps(response.json(), indent=2)}
```
"""
        else:
            return f"Error: {response.status_code}\n{response.text}"
    except Exception as e:
        return f"Error: {str(e)}"

def get_health():
    """Check Nory service health"""
    try:
        response = requests.get(f"{NORY_BASE}/api/x402/health")
        return json.dumps(response.json(), indent=2)
    except Exception as e:
        return f"Error: {str(e)}"

def get_api_directory():
    """Get list of all paid APIs"""
    try:
        response = requests.get(f"{NORY_BASE}/api/paid")
        if response.status_code == 200:
            return json.dumps(response.json(), indent=2)
        return f"Error: {response.status_code}"
    except Exception as e:
        return f"Error: {str(e)}"

# Create Gradio interface
with gr.Blocks(
    title="Nory x402 - AI Agent Payments",
    theme=gr.themes.Soft(primary_hue="emerald"),
    css="""
    .gradio-container { max-width: 1200px !important; }
    .gr-button { min-height: 45px; }
    """
) as demo:
    gr.Markdown("""
# Nory x402 - Payment Infrastructure for AI Agents

**Let AI agents pay for APIs autonomously using the x402 protocol (HTTP 402).**

- Sub-400ms settlement on Solana
- USDC stablecoin payments
- Works with any AI framework (CrewAI, AutoGPT, LangChain, etc.)

[Website](https://noryx402.com) | [Docs](https://noryx402.com/docs) | [npm](https://www.npmjs.com/package/nory-x402-payer)
    """)

    with gr.Tabs():
        with gr.TabItem("Test Paid APIs"):
            gr.Markdown("""
### Try a Paid API
Select an API and see the x402 payment flow in action. Without payment, you'll get a 402 response with payment requirements.
            """)

            with gr.Row():
                api_dropdown = gr.Dropdown(
                    choices=["Crypto Prices", "Weather", "QR Code", "Web Summary", "Translate", "Mock Data"],
                    value="Crypto Prices",
                    label="Select API"
                )
                param_input = gr.Textbox(
                    label="Parameter (optional)",
                    placeholder="BTC,ETH,SOL | London | URL | etc."
                )

            test_btn = gr.Button("Test API (Get 402 Response)", variant="primary")
            api_output = gr.Markdown(label="Response")

            test_btn.click(
                fn=test_paid_api,
                inputs=[api_dropdown, param_input],
                outputs=api_output
            )

        with gr.TabItem("Payment Requirements"):
            gr.Markdown("""
### Get Payment Requirements
See exactly what payment is needed for any x402-protected resource.
            """)

            with gr.Row():
                endpoint_input = gr.Textbox(
                    value="/api/paid/live-crypto",
                    label="Endpoint"
                )
                amount_input = gr.Textbox(
                    value="0.001",
                    label="Amount (USDC)"
                )

            req_btn = gr.Button("Get Requirements", variant="primary")
            req_output = gr.Code(language="json", label="Payment Requirements")

            req_btn.click(
                fn=get_payment_requirements,
                inputs=[endpoint_input, amount_input],
                outputs=req_output
            )

        with gr.TabItem("API Directory"):
            gr.Markdown("""
### Available Paid APIs
All x402-enabled endpoints you can pay for and access.
            """)

            dir_btn = gr.Button("Load API Directory", variant="primary")
            dir_output = gr.Code(language="json", label="Paid APIs")

            dir_btn.click(fn=get_api_directory, outputs=dir_output)

        with gr.TabItem("Health Check"):
            gr.Markdown("""
### Service Health
Check Nory's service status and supported networks.
            """)

            health_btn = gr.Button("Check Health", variant="primary")
            health_output = gr.Code(language="json", label="Health Status")

            health_btn.click(fn=get_health, outputs=health_output)

        with gr.TabItem("Integration Code"):
            gr.Markdown("""
### Integration Examples

#### For AI Agents (Payer SDK)
```javascript
import { NoryPayer } from 'nory-x402-payer';

const payer = new NoryPayer({
  privateKey: process.env.SOLANA_PRIVATE_KEY,
  network: 'solana-mainnet'
});

// Automatically handles 402 responses with payment
const { data, payment } = await payer.fetch('https://api.example.com/premium');

console.log('Data:', data);
console.log('Paid:', payment?.amount, 'USDC');
```

#### For API Providers (Middleware)
```javascript
import { x402Middleware } from 'nory-x402-middleware';

app.use('/api/premium', x402Middleware({
  amount: '0.01',        // $0.01 USDC
  wallet: 'your-wallet',
  network: 'solana-mainnet'
}));
```

#### MCP Server (for Claude)
```bash
npm install nory-mcp-server
```

Add to Claude Desktop config:
```json
{
  "mcpServers": {
    "nory": {
      "command": "npx",
      "args": ["nory-mcp-server"],
      "env": {
        "NORY_WALLET_KEY": "your-private-key"
      }
    }
  }
}
```
            """)

    gr.Markdown("""
---
### Resources
- **npm packages**: [nory-x402-payer](https://npmjs.com/package/nory-x402-payer) | [nory-x402-middleware](https://npmjs.com/package/nory-x402-middleware) | [nory-mcp-server](https://npmjs.com/package/nory-mcp-server)
- **Documentation**: [noryx402.com/docs](https://noryx402.com/docs)
- **OpenAPI Spec**: [noryx402.com/openapi.yaml](https://noryx402.com/openapi.yaml)
- **x402 Protocol**: [github.com/coinbase/x402](https://github.com/coinbase/x402)
    """)

if __name__ == "__main__":
    demo.launch()