Preflight

Verify all of the following before proceeding. Block and inform the user if any check fails.

1. viem installed

node -e "require('viem')" 2>/dev/null && echo OK || echo MISSING

If missing, install it:

npm install viem

2. EVM wallet

An EVM wallet capable of signing and sending transactions on BNB Chain (chain ID 56) must be available. The method of signing (private key, hardware wallet, browser wallet, MPC, etc.) is determined by the caller — this skill mainly helps you construct the transaction data.

3. BNB mainnet RPC access

Ask for an RPC URL for BNB Chain mainnet (chain ID 56). A public fallback is https://bsc-dataseed.binance.org/.

Verify connectivity:

import { createPublicClient, http } from "viem";
import { bsc } from "viem/chains";

const client = createPublicClient({ chain: bsc, transport: http(RPC_URL) });
const block = await client.getBlockNumber();
console.log("Latest block:", block);

4. Sufficient BNB balance

The wallet needs BNB for:

• Gas fees (launching costs ~0.002–0.010 BNB in gas).

• Any initial buy amount (quoteAmt) the user wants to spend.

Check balance:

const balance = await client.getBalance({ address: walletAddress });
// balance is in wei; 1 BNB = 1e18 wei

Warn if balance is below 0.01 BNB (exclusive of launch buy amount).