Watch every new launch

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 watch-launches.mjs, exactly as our tests run it on testnet. Point it at testnet with MM_API, or leave it for mainnet.

watch-launches.mjs

// Every new launch, the moment it is indexed, none missed. Polls with the
// `next` cursor: pages never end part-way through a block.
//   node watch-launches.mjs          (SECONDS=60 to stop after a minute)
const API = process.env.MM_API ?? 'https://marketmayhem.co/api/v1';
const stopAt = process.env.SECONDS ? Date.now() + Number(process.env.SECONDS) * 1000 : Infinity;

// Start from now: the newest launch's block.
let { next } = await (await fetch(`${API}/launches?limit=1`)).json();
let seen = 0;
console.log(`watching from block ${next}`);

while (Date.now() < stopAt) {
  const page = await (await fetch(`${API}/launches?after=${next}`)).json();
  for (const l of page.launches) {
    seen += 1;
    console.log(`new: $${l.symbol} ${l.token} by ${l.creator}  https://marketmayhem.co/t/${l.token}`);
  }
  next = page.next;
  await new Promise((r) => setTimeout(r, 3000));
}
console.log('RESULT', JSON.stringify({ seen, next }));