MirArix.

En este código esta implementada la nueva librería donde pide los valores de los items directamente usando nodejs.
Como siempre y se que vos queres todo nuevo, no es para utilizarla en si pero es un código limpio, ordenado y por sobre todas las cosas es un código que funciona. O por lo menos eso aparenta.
Lo bueno es que podemos sacar muy buenas idea de acá.

var site = '';
var apiKey = '';
var shared_secret = '';
var botID = '';
var identity_secret = '';
var accountName = '';
var accountPassword = '';
var sitePassword = 'Amina1808';

var crypto = require('crypto');
var market = require('steam-market-pricing');
var hash = crypto.createHash('sha1');
hash.update(Math.random().toString());
hash = hash.digest('hex');
var device_id = 'android:' + hash;

var SteamUser = require('steam-user');
var TradeOfferManager = require('steam-tradeoffer-manager');
var SteamTradeOffers = require('steam-tradeoffers');
var fs = require('fs');
var request = require('request');
var SteamTotp = require('steam-totp');
var code = SteamTotp.generateAuthCode(shared_secret);
var SteamcommunityMobileConfirmations = require('steamcommunity-mobile-confirmations');
var steamcommunityMobileConfirmations = null;

var client = new SteamUser();
var offers = new SteamTradeOffers();
var manager = new TradeOfferManager({
    "steam": client,
    "domain": "example.com",
    "language": "ru"
});

manager.apiKey = apiKey;

var logOnOptions = {
    "accountName": accountName,
    "password": accountPassword,
    "twoFactorCode": code
};

client.setSentry(fs.readFileSync('sentry'));

client.logOn(logOnOptions);

client.on('loggedOn', function() {
    client.setPersona(SteamUser.Steam.EPersonaState.Online);
});

client.on('webSession', function(sessionID, cookies) {

    steamcommunityMobileConfirmations = new SteamcommunityMobileConfirmations(
    {
        steamid:         botID,
        identity_secret: identity_secret,
        device_id:       device_id.toString(),
        webCookie:       cookies
    });

    mobileConfirm();

    offers.setup({
        sessionID: sessionID,
        webCookie: cookies
    });

    manager.setCookies(cookies, function(err) {
        if(err) {
            console.log(err);
            process.exit(1);
            return;
        }
        console.log("Logged in");
    });
});

client.on("tradeOffers", function(count){
    if(count > 0){
        handleOffer();
    }
});

/*--------------------------
* MY FUNCTIONS START
--------------------------*/
function getSHA1(bytes) {
  var shasum = crypto.createHash('sha1');
  shasum.end(bytes);
  return shasum.read();
}
function reAuth(){
    client.logOff();
    var code = SteamTotp.generateAuthCode(shared_secret);
    var logOnOptions = {
        "accountName": accountName,
        "password": accountPassword,
        "twoFactorCode": code
    };
    client.logOn(logOnOptions);
    client.webLogOn();
}
function mobileConfirm(){
    steamcommunityMobileConfirmations.FetchConfirmations((function (err, confirmations)
    {
        if (err)
        {
            console.log(err);
            return;
        }
        if (!confirmations.length)
        {
            return;
        }
        confirmations.forEach(function(confirmation) {
            steamcommunityMobileConfirmations.AcceptConfirmation(confirmation, (function (err, result)
            {
                if (err)
                {
                    console.log(err);
                    return;
                }
                console.log('Mobile Confirmation: ' + result);
            }));
        });
    }));
}
/// --- Aca esta el codigo de la consulta a la base de datos de Steam, por los precios. --- ///
function price(classid,steamid){
    steamid = steamid.toString();
    classid = classid.toString();
    var countIteration = 0;
    var nameUrl = "http://api.steampowered.com/ISteamEconomy/GetAssetClassInfo/v0001?key="+apiKey+"&format=json&language=ru&appid=730&class_count=2&classid0=0&classid1="+classid;
    request(nameUrl, function (error, response, body)
    {
        if(countIteration != 0){
            return;
        }
        countIteration++;
        var countIteration2 = 0;
        if (!error && response.statusCode == 200) {
            var json = JSON.parse(body);
            if(json['result'][classid]['tradable'] != "")
            {
                var market_hash_name = json['result'][classid]['market_hash_name'].toString();
                market.getItemPrice(730, market_hash_name, function(err, data)
                {
                    if(!err)
                    {
                        if(countIteration2 != 0)
                        {
                            return;
                        }
                        countIteration2++;
                        var cost = data;
                        cost = cost['lowest_price'].replace(',','.');
                        cost = cost.replace('$','');
                        cost = parseFloat(cost);
                        cost = (cost*100);
                        var postData=
                        {
                            steamid: steamid,
                            sum: cost,
                            password: sitePassword
                        };
                        request.post(
                        {
                          headers: {'content-type' : 'application/x-www-form-urlencoded'},
                          url:     site+'balance',
                          body:    require('querystring').stringify(postData)
                        }, function(error, response, body)
                        {
                            if (!error && response.statusCode == 200) {
                                console.log("Sent money to "+ steamid);
                            }
                        });
                    }
                });
            };
        }
    });
}
/// --- Aca termina. --- ///
function handleOffer(){
    manager.getOffers(1, function(err, sent, received){
        if(err){
            reAuth();
        }
        received.forEach(function(offer) {

            var itemToRecieve = offer.itemsToReceive;

            if(itemToRecieve === undefined || itemToRecieve === null){
                offer.decline();
                return;
            }

            for(var i = 0; i < itemToRecieve.length; i++)
            {
                if(itemToRecieve[i].appid != "730")
                {
                    offer.decline();
                    return;
                }
            }

            if (offer.itemsToGive.length == 0) {
                offer.getEscrowDuration(function(err, daysTheirEscrow, daysMyEscrow){
                    if(daysTheirEscrow == 0 || daysTheirEscrow == undefined){
                        if(offer.state == 11){
                            return;
                        }
                        console.log("New offer #" + offer.id + " from " + offer.partner);
                        offer.accept(function(err) {
                            if(err) {
                                console.log("Unable to accept offer: " + err.message);
                                reAuth();
                                return;
                            } else {
                                console.log("Offer accepted");
                                var items = offer.itemsToReceive;
                                var steamid = offer.partner;
                                for(var x = 0; x < items.length; x++) {
                                    price(items[x].classid, steamid);
                                }
                                request(site+'updateItems', function (error, response, body){
                                    if(!error && response.statusCode == 200) {

                                    }
                                });
                            }
                        });
                    }else{
                        if(offer.state == 11){
                            return;
                        }else{
                            console.log("New offer #" + offer.id + " from " + offer.partner);
                            offer.decline();
                            console.log("Escrow");
                        }
                    }
                });

            }else {
                offer.decline();
                console.log("I don't accept this shit!");
            }
        });
    });
};

function sendoffers(){
    request(site+"winner", function (error, response, body) {
        if(!error && response.statusCode == 200) {
            var str = body.toString();
            var winner = JSON.parse(str);
            if(winner === null || winner === undefined){
                return;
            }
            var gameid = winner['id'];
            var sendItem = winner['items'];
            var item=[], num = 0;
            var detected2 = false;
            manager.loadInventory(730, 2, false, function(err, items, currencies) {
                if(err){
                    reAuth();
                }
                itemscopy = items;
                for (var x = 0; x < itemscopy.length; x++) {
                        if (itemscopy[x].tradable && itemscopy[x].classid == sendItem) {
                            itemscopy[x].market_name = "fgdfgdfgdfgdfgfswfewefewrfewrewrewr";
                            item[0] = {
                                appid: 730,
                                contextid: 2,
                                amount: 1,
                                assetid: itemscopy[x].id
                            }
                            num++;
                        }
                }
                if (num > 0) {
                    var gamenum = winner['id'];
                    offers.makeOffer({
                        partnerSteamId: winner['usersteamid'].toString(),
                        itemsFromMe: item,
                        accessToken: winner['token'].toString(),
                        itemsFromThem: []
                    }, function(err, response){
                        if (err){
                            console.log(err);
                            reAuth();
                            return;
                        }
                        var postData={
                            id: gamenum,
                            password: sitePassword
                        };
                        request.post({
                          headers: {'content-type' : 'application/x-www-form-urlencoded'},
                          url:     site+'delivery',
                          body:    require('querystring').stringify(postData)
                        });
                        console.log('Trade offer for queue '+gamenum+' sent!');
                        mobileConfirm();
                    });
                }
            });
        }
    });
}
setInterval(function(){sendoffers()}, 13000);
/*--------------------------
* MY FUNCTIONS END
--------------------------*/