Calculo de ganancia aproximada en cryptomkt según ticker actual

gist.js

/******************************************************
*
* Calcula beneficio cada x segundos
*
* Este script solo funciona en la consola del navegador 
* en cryptomkt.com
*
* init: se ejecuta una sola vez
* update: se ejecuta cada x segundos 
*
* config \
* config.interval: cantidad de segundos de espera
*
* Datos disponibles en la api interna de cryptomkt: 
*
*    window.balances
*
*    window.orders
*
*    window.board \
*    window.board.ETHARS
*    window.board.XMLARS
*
*******************************************************/
(()=>{

    var investment = 7200 // en moneda corriente ($)

    // *************************** //
    // *** logic ***************** //
    // *************************** //
    function init() {

        // balance moneda corriente
        let balance = helpers.getBalance(config.base)
        let available = parseFloat(balance.disponible).toFixed(2)
        console.log(`${config.base} balance: ${available} ${config.base}`)                 
    }

    function update() {
        
        let profit

        for(const coin of config.coins) {
            
            profit = calculateProfit(coin, investment)
            const msg = `${coin} profit: ${profit} ${config.base}`
            
            if(profit >= config.minProfit) {
                helpers.notify( 'Oportunidad spread', msg )
            }

            console.log(msg)
        } 

        console.log('---')        
    }

    /**
    * Calcula ganancia aproximada segun ticker actual
    */
    function calculateProfit(coin, investment) {

        let {bid, ask} = helpers.getTicker(coin)
        let profit = helpers.calculateProfit(bid, ask, investment)
        return profit
    }

    // *************************** //
    // *** config **************** //
    // *************************** //
    const config = {
        fee: 1.006, // aprox
        coins: ['ETH', 'XLM'],
        base: 'ARS',
        interval: 5, // segundos
        notifications: {
            logo: 'https://www.cryptomkt.com/static/principal/img/xcrypto-logo-mini.png.pagespeed.ic.oEbyJO3iOB.webp'
        },
        minProfit: 100
    }

    // *************************** //
    // *** functions ************* //
    // *************************** //
    const helpers = 
    {
        calculateProfit: (bid, ask, investment) => {

            let amount_crypto = (investment / bid) / config.fee
            let new_balance = (amount_crypto * ask) / config.fee
            let profit = new_balance - investment
            return profit.toFixed(2)    
        },

        getTicker: (coin = 'ETH') => {

            const ticker = window.board[coin+config.base]

            return {
                bid: ticker.BID,
                ask: ticker.ASK,
                spread: ticker.ASK - ticker.BID
            }
        },

        getBalance: (currency = 'ARS') => {

            return window.balances.find(x=>x.currency_name === currency)    
        },

        notify: (message, title = '', link = null) => {

            if (Notification.permission === "granted") {

                if(typeof this.notification !== 'undefined') {
                    this.notification.close()
                }

                this.notification = new Notification(title, {
                    icon: config.notifications.logo,
                    body: message,
                });

                if(link) {
                    this.notification.onclick = () => {
                        window.open(link);      
                    };
                }
            }
        }
    }

    init()
    update()
    setInterval(()=>update(), config.interval*1000)    

    return '_';
})();