Viem

import { createWalletClient, custom } from 'viem';
import { aurum } from './aurum';

const walletClient = createWalletClient({
  transport: custom(aurum.rpcProvider),
});

const [address] = await walletClient.getAddresses();

const signature = await walletClient.signMessage({ 
  account: address, 
  message: 'Hello!',
});

import { parseEther } from 'viem';

const [address] = await walletClient.getAddresses();

const hash = await walletClient.sendTransaction({
  account: address,
  to: '0x...',
  value: parseEther('0.01'),
});

const hash = await walletClient.writeContract({
  address: tokenAddress,
  abi: erc20Abi,
  functionName: 'transfer',
  args: [recipient, amount],
  account: address,
});

import { createPublicClient, http } from 'viem';

const publicClient = createPublicClient({
  transport: http('https://eth-mainnet.g.alchemy.com/v2/YOUR_API_KEY'),
});

const balance = await publicClient.readContract({
  address: tokenAddress,
  abi: erc20Abi,
  functionName: 'balanceOf',
  args: [walletAddress],
});