otario.js

async function loadNumber() {
  return fetch(API_URL);
}

const number = await loadNumber();

// essa linha nao executa enquanto `loadNumber` nao tiver acabado
const multiplyRequest = fetch(API_URL, {data: number});
const sumRequest = fetch(API_URL, {data: number});
const promise = Promise.all(multiplyRequest, sumRequest).then((multiply, sum) => {
  // esse callback só executa qnd as 2 requests acabarem
  console.log(multiply);
  console.log(sum);
})