sell-thurs-buy-mon.js

const axios = require("axios");
const { table } = require("table");

const pair = "ETH/USD";
const initialAmount = 1.0;
const numberOfWeeks = 26;
const firstSellTimestamp = 1609473600;
const firstBuyTimestamp = 1609747200;
const interval = 7 * 24 * 60 * 60; // a week

const getPrice = async (timestamp) => {
  let response = await axios.get(
    `https://ftx.com/api/markets/${pair}/candles?resolution=15&start_time=${timestamp}&end_time=${timestamp}`
  );
  return response.data.result[0].close;
};

const formatPrice = (price) => {
  return "$" + price.toFixed(0);
};

const formatPercent = (decimal) => {
  const sign = decimal > 0 ? "+" : "-";
  return sign + Math.abs(100 * decimal).toFixed(1) + "%";
};

(async () => {
  let results = [];
  let amount = initialAmount;

  for (let week = 0; week < numberOfWeeks; week++) {
    process.stdout.write(`Fetching data for week ${week + 1}... `);

    const sellTimestamp = firstSellTimestamp + week * interval;
    const buyTimestamp = firstBuyTimestamp + week * interval;

    const sellPrice = await getPrice(sellTimestamp);
    const buyPrice = await getPrice(buyTimestamp);

    const sellProceed = amount * sellPrice;
    const buyProceed = sellProceed / buyPrice;
    const weeklyRoi = buyProceed / amount - 1;
    amount = buyProceed;

    results.push([
      sellTimestamp,
      formatPrice(sellPrice),
      buyTimestamp,
      formatPrice(buyPrice),
      amount.toFixed(4),
      formatPercent(weeklyRoi),
    ]);

    console.log("Done!");
  }

  return results;
})().then((results) => {
  console.log("\n" + table(results));
  console.log(
    "ROI:",
    formatPercent(results[results.length - 1][4] / initialAmount - 1)
  );
});