Perform swaps

import 'package:portal_flutter/portal_flutter.dart';

final portal = Portal();

// Perform a swap on Base
final result = await portal.swap(
  swapsApiKey: 'YOUR_SWAPS_API_KEY',
  chainId: 'eip155:8453', // Base mainnet
  sellToken: '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE', // Native ETH
  buyToken: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913', // USDC on Base
  amount: '1000000000000000', // 0.001 ETH in wei
);

if (result.success) {
  print('Swap successful!');
  print('Transaction hash: ${result.transactionHash}');
} else {
  print('Swap failed');
}

final result = await portal.swap(
  swapsApiKey: 'YOUR_SWAPS_API_KEY',
  chainId: 'eip155:8453',
  sellToken: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913', // USDC
  buyToken: '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE', // Native ETH
  amount: '10000000', // 10 USDC (6 decimals)
);

try {
  final result = await portal.swap(
    swapsApiKey: 'YOUR_SWAPS_API_KEY',
    chainId: 'eip155:8453',
    sellToken: '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE',
    buyToken: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913',
    amount: '1000000000000000',
  );

  if (result.success) {
    print('Swap completed: ${result.transactionHash}');
  }
} on PortalException catch (e) {
  print('Swap failed: ${e.message}');
  print('Error code: ${e.code}');
}