402fly-client

HTTP client library for the X402 payment protocol with automatic payment handling.

Overview

The 402fly-client package provides HTTP client libraries that automatically handle X402 payment requirements. When accessing payment-protected APIs, the client can automatically detect payment requirements, process payments, and retry requests with payment authorization.

Features

• Automatic detection of payment-required responses (402 status)
• Seamless payment processing and request retry
• Support for both automatic and explicit payment flows
• Wallet management and transaction handling
• Built on top of httpx for modern async/sync HTTP support

Installation

pip install 402fly-client

Usage

Fly402AutoClient - Automatic Payment Handling

The Fly402AutoClient automatically handles payment requirements transparently:

from 402fly_client import Fly402AutoClient
from solders.keypair import Keypair
import asyncio

# Load your wallet keypair
keypair = Keypair()  # Or load from file

# Create client with automatic payment handling
client = Fly402AutoClient(
    wallet_keypair=keypair,
    max_payment="5.0",  # Maximum payment amount (safety limit)
    auto_retry=True,    # Automatically retry after payment
)

async def fetch_data():
    # Client automatically handles payment if required
    response = await client.fetch("https://api.example.com/premium-data")
    print(response.text)

    await client.close()

asyncio.run(fetch_data())

Fly402Client - Explicit Payment Control

For more control over the payment process:

from 402fly_client import Fly402Client
from solders.keypair import Keypair
import asyncio

keypair = Keypair()
client = Fly402Client(wallet_keypair=keypair)

async def fetch_with_explicit_payment():
    try:
        # First request (may return 402 Payment Required)
        response = await client.fetch("https://api.example.com/premium-data")
        print(response.text)
    except Exception as e:
        if "402" in str(e):
            # Handle payment explicitly
            print("Payment required - processing...")
            # The client provides methods for explicit payment handling

    await client.close()

asyncio.run(fetch_with_explicit_payment())

Loading Wallet from File

import json
from solders.keypair import Keypair

# Load wallet from Solana CLI format
with open("wallet.json") as f:
    wallet_data = json.load(f)
    keypair = Keypair.from_bytes(bytes(wallet_data))

Configuration

Key parameters for Fly402AutoClient:

• wallet_keypair: Your Solana wallet keypair for payments
• max_payment: Maximum payment amount (in tokens) - safety limit
• auto_retry: Whether to automatically retry after payment (default: True)
• rpc_url: Solana RPC endpoint (default: devnet)
• timeout: HTTP request timeout

Example: Integration with Existing Code

from 402fly_client import Fly402AutoClient
from solders.keypair import Keypair

# Minimal changes to add payment support
keypair = Keypair()
client = Fly402AutoClient(wallet_keypair=keypair, max_payment="10.0")

# Use like a normal HTTP client
response = await client.fetch("https://api.example.com/data")
data = response.json()

Documentation

For complete API reference and guides, see:

• Documentation
• GitHub Repository
• Examples

Testing

pytest tests/

License

MIT License - See LICENSE file for details.