Network & Token Support

const usdcAddress = '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'; // Base

const daiAddress = '0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb'; // Base

// Check if token has permit function
const hasPermit = await token.read.permit !== undefined;

// Or check for DOMAIN_SEPARATOR (required for EIP-712)
const hasDomainSeparator = await token.read.DOMAIN_SEPARATOR !== undefined;

import { X402Client } from 'anyspend-x402-client';

const client = new X402Client({
  walletClient,
  preferredToken: '0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb', // DAI on Base
  network: 'base-mainnet'
});

const response = await client.request('https://api.example.com/data', {
  preferredToken: '0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb' // DAI on Base
});

import { paymentMiddleware, facilitator } from '@b3dotfun/anyspend-x402';

const endpointConfig = {
  '/api/data': {
    amount: '1.00',        // $1 worth of any token
    asset: 'USD',          // Let client choose token
    network: 'base-mainnet'
  }
};

app.use(paymentMiddleware(
  '0xYourUSDCAddress...',  // Receive USDC
  endpointConfig,
  facilitator
));

// Client pays with DAI on Ethereum
const clientPayment = {
  token: '0x6B175474E89094C44Da98b954EedeAC495271d0F', // DAI on Ethereum
  network: 'ethereum-mainnet',
  amount: '1.0'
};

// Resource server receives USDC on Base
const serverSettlement = {
  token: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913', // USDC on Base
  network: 'base-mainnet',
  amount: '1.00'
};

// AnySpend handles:
// 1. Receive DAI on Ethereum
// 2. Bridge DAI from Ethereum → Base
// 3. Swap DAI → USDC on Base
// 4. Settle USDC to resource server