HTTP-native payments for AI agents

const { createSigner, x402Fetch } = require('@primersystems/x402')

// Create signer (CAIP-2 network format)
const signer = await createSigner('eip155:8453', process.env.PRIVATE_KEY)

// Wrap fetch (or use x402Axios for axios)
const fetch402 = x402Fetch(fetch, signer, { maxAmount: '1.00' })

const res = await fetch402('https://example.com/api/premium')

const { x402Express } = require('@primersystems/x402')

app.use(x402Express('0xYourAddress', {
  '/api/premium': {
    amount: '0.01',
    asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913', // USDC
    network: 'eip155:8453' // Base
  }
}))

// Also: x402Hono, x402Next

import os
from primer_x402 import create_signer, x402_requests

# Create signer (CAIP-2 network format)
signer = create_signer('eip155:8453', os.environ['PRIVATE_KEY'])

# Create session that handles 402 payments
with x402_requests(signer, max_amount='1.00') as session:
    response = session.get('https://example.com/api/premium')
    print(response.json())

from flask import Flask, jsonify
from primer_x402 import x402_flask

app = Flask(__name__)

@app.before_request
@x402_flask('0xYourAddress', {
    '/api/premium': {
        'amount': '0.01',
        'asset': '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913', # USDC
        'network': 'eip155:8453' # Base
    }
})
def require_payment():
    pass

# Also: x402_fastapi middleware