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

# Flask

## Getting started with Flask

Start accepting x402 payments in your Flask server in 2 minutes.

<Note>You can find the full code for this example [here](https://github.com/x402-foundation/x402/tree/main/examples/python/servers/flask).</Note>

### Step 1: Install dependencies

```bash theme={null}
pip install x402 flask python-dotenv
```

### Step 2: Set your environment variables

```bash theme={null}
echo "ADDRESS=0x...\nFACILITATOR_URL=https://facilitator.payai.network" > .env
```

### Step 3: Create a new Flask app

```python main.py lines icon="python" theme={null}
import os
from flask import Flask, jsonify
from dotenv import load_dotenv
from x402.facilitator import FacilitatorConfig
from x402.flask.middleware import PaymentMiddleware
from x402.types import EIP712Domain, TokenAmount, TokenAsset

# Load environment variables
load_dotenv()

# Get configuration from environment
ADDRESS = os.getenv("ADDRESS")
FACILITATOR_URL = os.getenv("FACILITATOR_URL")

if not ADDRESS or not FACILITATOR_URL:
    raise ValueError("Missing required environment variables")

facilitator_config = FacilitatorConfig(url=FACILITATOR_URL)

app = Flask(__name__)

# Initialize payment middleware
payment_middleware = PaymentMiddleware(app)

# Apply payment middleware to specific routes
payment_middleware.add(
    path="/weather",
    price="$0.001",
    pay_to_address=ADDRESS,
    network="base-sepolia",
    facilitator_config=facilitator_config,
)

# Apply payment middleware to premium routes
payment_middleware.add(
    path="/premium/*",
    price=TokenAmount(
        amount="10000",
        asset=TokenAsset(
            address="0x036CbD53842c5426634e7929541eC2318f3dCF7e",
            decimals=6,
            eip712=EIP712Domain(name="USDC", version="2"),
        ),
    ),
    pay_to_address=ADDRESS,
    network="base-sepolia",
    facilitator_config=facilitator_config,
)


@app.route("/weather")
def get_weather():
    return jsonify(
        {
            "report": {
                "weather": "sunny",
                "temperature": 70,
            }
        }
    )


@app.route("/premium/content")
def get_premium_content():
    return jsonify(
        {
            "content": "This is premium content",
        }
    )


@app.route("/public")
def public():
    return jsonify({"message": "This is a public endpoint."})


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=4021, debug=True)
```

### Step 4: Run the server

```bash theme={null}
flask run
```

<Check>
  Your server is now accepting x402 payments!
</Check>

### Step 5: Test the server

You can test payments against your server locally by following the [httpx example](https://github.com/x402-foundation/x402/tree/main/examples/python/clients/httpx) or the [requests example](https://github.com/x402-foundation/x402/tree/main/examples/python/clients/requests) from the x402 repository.

Just set your environment variables to match your local server, install the dependencies, and run the examples.

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