Launch on purps.lol

import fs from "node:fs";
import { Keypair, VersionedTransaction } from "@solana/web3.js";
import bs58 from "bs58";

const API = "https://purps.lol/api/v2";
const creator = Keypair.fromSecretKey(Uint8Array.from(JSON.parse(fs.readFileSync("creator.json", "utf8"))));
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

async function call(path, body) {
  const headers = { "x-helius-key": process.env.HELIUS_API_KEY, ...(body ? { "content-type": "application/json" } : {}) };
  const res = await fetch(API + path, { method: body ? "POST" : "GET", headers, body: body ? JSON.stringify(body) : undefined });
  const json = await res.json();
  if (!json.ok) throw new Error(`${path}: ${json.error}`);
  return json.data;
}

// 1. build: the terms, the logo and the socials, in one call
const image = `data:image/png;base64,${fs.readFileSync("my-coin.png").toString("base64")}`;
const build = await call("/launches", {
  name: "My Coin",
  symbol: "MINE",
  quoteMint: "So11111111111111111111111111111111111111112",
  feePreset: "airdrop",
  devBuySol: 0.1,
  creatorWallet: creator.publicKey.toBase58(),
  image,
  description: "Fees go to holders.",
  twitter: "https://x.com/mycoin",
});
console.log("mint", build.mint);

// 2. sign and send, one at a time
const mintKey = Keypair.fromSecretKey(bs58.decode(build.mintSecret));
for (const [i, b64] of build.transactions.entries()) {
  const tx = VersionedTransaction.deserialize(Buffer.from(b64, "base64"));
  tx.sign(i === build.createIndex ? [creator, mintKey] : [creator]);
  let { signature: sig, confirmed } = await call("/transactions/send", { transaction: Buffer.from(tx.serialize()).toString("base64"), wait: 30 });
  while (!confirmed) {
    await sleep(2000);
    const st = await call(`/transactions/${sig}`);
    if (st.failed) throw new Error(`transaction ${sig} failed on chain`);
    confirmed = st.confirmed;
  }
  console.log("landed", sig);
}

// 3. wait for live
for (;;) {
  const launch = await call(`/launches/${build.mint}`);
  if (launch.status === "live") break;
  if (launch.status === "failed") throw new Error("launch failed");
  await sleep(3000);
}
console.log("live at", build.url);