Handle Native Tokens

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