const balance = await publicClient.readContract({
  address: TOKEN_ADDRESS,
  abi: [{
    name: 'balanceOf',
    type: 'function',
    inputs: [{ type: 'address' }],
    outputs: [{ type: 'uint256' }]
  }],
  functionName: 'balanceOf',
  args: [walletAddress]
});

// For USDC (6 decimals): Number(balance) / 1e6
// For most tokens (18 decimals): Number(balance) / 1e18

import { encodeFunctionData, parseUnits } from 'viem';

const amount = parseUnits('10', 6); // 10 USDC (6 decimals)

const txHash = await walletClient.sendTransaction({
  to: USDC_ADDRESS,
  data: encodeFunctionData({
    abi: [{
      name: 'transfer',
      type: 'function',
      inputs: [{ type: 'address' }, { type: 'uint256' }],
      outputs: [{ type: 'bool' }]
    }],
    functionName: 'transfer',
    args: [recipientAddress, amount]
  })
});

import { maxUint256 } from 'viem';

const txHash = await walletClient.sendTransaction({
  to: TOKEN_ADDRESS,
  data: encodeFunctionData({
    abi: [{
      name: 'approve',
      type: 'function',
      inputs: [{ type: 'address' }, { type: 'uint256' }],
      outputs: [{ type: 'bool' }]
    }],
    functionName: 'approve',
    args: [spenderAddress, maxUint256] // Unlimited approval
  })
});