Launch with a first buy and a burn

Tested on BSC testnet before every release

This is an example. Every value in it (names, amounts, addresses) is there to show you how; change any of them to suit you. It’s launch-with-burn.mjs, exactly as our tests run it on testnet. Point it at testnet with MM_API, or leave it for mainnet.

// Launch a token with a first buy in the same transaction (nobody can buy
// before you), burn part of that buy at launch, and send the creator royalty to
// buy back and burn the token for ever.
//   PRIVATE_KEY=0x… node launch-with-burn.mjs
import { JsonRpcProvider, Wallet } from 'ethers';

const API = process.env.MM_API ?? 'https://marketmayhem.co/api/v1';
const DEAD = '0x000000000000000000000000000000000000dEaD';

const settings = await (await fetch(`${API}/settings`)).json();
const rpc = settings.chainId === 56 ? 'https://bsc-dataseed.bnbchain.org' : 'https://bsc-testnet-rpc.publicnode.com';
const wallet = new Wallet(process.env.PRIVATE_KEY, new JsonRpcProvider(rpc, settings.chainId));

const res = await fetch(`${API}/build/launch`, {
  method: 'POST',
  headers: { 'content-type': 'application/json' },
  body: JSON.stringify({
    wallet: wallet.address,
    name: process.env.NAME ?? 'Moth',
    symbol: process.env.SYMBOL ?? 'MOTH',
    marketCapUsd: process.env.MARKET_CAP_USD ?? '5000',
    firstBuy: process.env.FIRST_BUY ?? '0.01',                        // in BNB
    firstBuyTo: [{ wallet: DEAD, pct: 60 }, { wallet: wallet.address, pct: 40 }],  // 60% of the buy burned
    burnPct: 100,                                                      // the royalty buys back and burns
    image: process.env.IMAGE ?? 'https://marketmayhem.co/icon-512.png',
    description: 'Moths go to the light.',
  }),
});
const launch = await res.json();
if (!res.ok) throw new Error(`${launch.error.code}: ${launch.error.message} ${launch.error.fix ?? ''}`);

console.log(launch.explain);
console.log(`the token will be ${launch.token}`);             // known before you send
const sent = await wallet.sendTransaction({ to: launch.tx.to, data: launch.tx.data, value: BigInt(launch.tx.value), gasLimit: BigInt(launch.tx.gas) });
const receipt = await sent.wait();
if (receipt.status !== 1) throw new Error(`reverted: ${sent.hash}`);
console.log(`launched: https://marketmayhem.co/t/${launch.token}`);
console.log('RESULT', JSON.stringify({ token: launch.token, hash: sent.hash }));