Handle Native Tokens

import { createWalletClient, http, parseEther, sendTransaction } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { mainnet } from "viem/chains";
// Create a wallet client using your private key
const account = privateKeyToAccount("YOUR_PRIVATE_KEY");
const client = createWalletClient({
  account,
  chain: mainnet,
  transport: http("https://eth-mainnet.g.alchemy.com/v2/YOUR_ALCHEMY_KEY"), // Provide an authenticated RPC URL to avoid rate-limiting
});
// Check if the sellToken is a native token (ETH) to skip the allowance check
if (eth.address === "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE") {
  console.log("Native token detected, no need for an allowance check");
} else {
  // Check if allowance is required for non-native tokens
  if (price.issues.allowance !== null) {
    try {
      const { request } = await eth.simulate.approve([
        price.issues.allowance.spender,
        maxUint256,
      ]);
      // Remainder of code...
    } catch (error) {
      console.error("Error approving token:", error);
    }
  }
}
// Check if it's a native token (like ETH)
if (eth.address === "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE") {
  const nonce = await client.getTransactionCount({
    address: client.account.address,
  });
  // Directly sign and send the native token transaction
  const txHash = await client.sendTransaction({
    account: client.account,
    chain: client.chain,
    gas: quote?.transaction.gas ? BigInt(quote.transaction.gas) : undefined,
    to: quote?.transaction.to,
    data: quote.transaction.data,
    value: BigInt(quote.transaction.value), // Ensure value is set for native tokens
    gasPrice: quote?.transaction.gasPrice
      ? BigInt(quote.transaction.gasPrice)
      : undefined,
    nonce: nonce,
  });
  // Log the transaction hash
  console.log("Transaction sent:", txHash);
}