index.js

const Binance = require('node-binance-api');

const binance = new Binance().options({
  APIKEY: '***',
  APISECRET: '***'
});

const low = require('lowdb')
const FileSync = require('lowdb/adapters/FileSync')

const adapter = new FileSync('db.json')
const db = low(adapter)

db.defaults({ pairs: [] }).write()

setInterval(() => {
  (async () => {
    console.log("getting pairs...")
    let ticker = await binance.prices();
    let entries = Object.entries(ticker).filter(pair => pair[0].endsWith("BUSD") && pair[0].includes("MARS"))
    console.log("number of pairs: " + entries.length)
    let pairs = db.get('pairs')
    for (var i = 0; i < entries.length; i++) {
      let pair = entries[i]

      if (pair[1] > 0) {
        if (pairs.find({ symbol: pair[0] }).value() === undefined) {
          // NEW PAIR

          let price = pair[1]

          let quantity = (50 / price).toFixed(1);

          console.log("trying to buy " + quantity + " amount of " + pair[0] + " ...")

          binance.marketBuy(pair[0], quantity, (error, response) => {
            if (error != null) {
              console.error("error", error)
            } else {
              pairs.push({ symbol: pair[0], price: pair[1] }).write()

              // console.info("Market Buy response", response);
              console.log("bought " + response["executedQty"] + " amount of " + response["symbol"] + ", cummulativeQuoteQty: " + response["cummulativeQuoteQty"] + " BUSD")

              console.log("[!] new pair added : " + pair[0])
            }
          });

          break
        }
      }

    }
  })()
}, 10000)

package.json

{
  "name": "binance",
  "version": "1.0.0",
  "description": "Binance",
  "main": "src/index.js",
  "dependencies": {
    "node-binance-api": "^0.12.4",
    "lowdb": "^1.0.0"
  },
  "devDependencies": {},
  "scripts": {
    "start": "node src/index.js"
  },
  "author": "Milad Doorbash",
  "license": "MIT"
}