fetch-data.js

const fetchData = async () => {
  let data = { index: [], price: [], volumes: [] };
  let result = await callAPI("https://api.coingecko.com/api/v3/coins/ethereum/market_chart?vs_currency=usd&days=1&interval=1m");
  for (const item of result.prices) {
      data.index.push(item[0]);
      data.price.push(item[1]);
  }
  for (const item of result.total_volumes) data.volumes.push(item[1]);
  return data;
};