Use Appropriate Network for Amount

Choose network based on transaction amount to optimize fees:

function selectNetwork(crypto, amount) {
  if (crypto === 'USDT') {
    // TRC20 has lowest fees, best for small amounts
    if (amount < 100) return 'trc20';
    // ERC20 for larger amounts where fee % is smaller
    if (amount >= 1000) return 'erc20';
    // BEP20 as middle ground
    return 'bep20';
  }

  // For native coins, use their primary network
  const primaryNetworks = {
    BTC: 'bitcoin',
    ETH: 'ethereum',
    BNB: 'bsc',
    TRX: 'tron',
  };

  return primaryNetworks[crypto];
}