Another gem right up my alley. Video here.

Overview

Backend server with Firebase cloud functions, Node function running on a chron job during market hours. Used Alpaca API for commission-free trades and real-time market data.

Gets started with firebase-tools

Need a firebase account to do this.

Installing alpaca dependency

npm i @alpacahq/alpaca-trade-api

The default firebase cloud function looks like this:

// functions/index.js

const functions = require('firebase-functions')

exports.helloWorld = functions.https.onRequest((request, response) => {})

He uses it to connect to GPT-3 and get the stocks that Cramer likes.

Run “npm run serve” to run the functions locally. This will give you a link to the browser with the function URL.

He also uses puppeteer to scrape Cramer’s twitter for some ideas and feeds this into the GPT-3 query.

In order to get started with Alpaca you need to make a deposit and get a SECRET API key.

const Alpaca = require("@alpacahq/alpaca-trade-api")
const alpaca = new Alpaca({
  keyId: functions.config().alpaca.id, // REPLACE with your API creds
  secretKey: functions.config.alpaca.key, // REPLACE with your API creds
  paper: true, // Trade with real money or not
})

// get account with important info like buying power
const account = await alpaca.getAccount()
console.log(`dry powder: ${account.buying_power}`)

// place order
// supports fractional shares with notional
const order = await alpaca.createOrder({
  symbol: "SPY",
  qty: 1,
  side: "buy",
  type: "market",
  time_in_force: "day"
})

Now sends the order as the response and so running the function should make a trade and return a confirmation number. Congratulations you are now an algo trader.

Wow.

Scheduled Cron Job

Run the code every day. A “Cron Job” is a schedule for doing work in the background on the server. Easily set one up with firebase using a pub/sub function, (scalable cloud function, firebase docs here).

Note: use a site like crontab.guru to help convert your desired interval into cron schedule expressions.

Also Note: He allocated memory because puppeteer uses a lot of memory.

exports.getRichQuick = functions.runWith({memory: "4GB"}).pubsub
  .schedule('0 10 * * 1-5')
  .timezone('America/New_York')
  .onRun(async (ctx) => {
    console.log("This will run M-F at 10:00am Eastern!")

   // pastes in the code from his cloud function

    return null
  })

He also cancels all orders and close out any open positions first just above creating account constant. Everyday he sells all his stocks and then buys a new one.

const cancel = await alpaca.cancelAllOrders()
const liquidate = await alpaca.closeAllPositions()

Run “firebase deploy” to push the code to the cloud.