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Market.csgo.com Steam Item Price

This script shows item lowest price on steam market

// ==UserScript==
// @name         Market.csgo.com Steam Item Price
// @version      1
// @description  This script shows item lowest price on steam market
// @author       Yakine
// @match        *market.csgo.com/item/*
// @match        *market.csgo.com/*/item/*
// @match        *market.dota2.net/*/item/*
// @match        *market.dota2.net/item/*
// @grant        GM_xmlhttpRequest

// @namespace steamcommunity.com/id/Yakine9
// ==/UserScript==

const dtm = new RegExp(/market.*dota2.*item/gm);
const csm = new RegExp(/market.*csgo.*item/gm);
let appid;

const currency = 0; // 5 for Rub
if (csm.test(window.location.href))
    appid = "730"
else if (dtm.test(window.location.href))
    appid = "570"
let req = `https://steamcommunity.com/market/priceoverview/?appid=${appid}&currency=${currency}&market_hash_name=`;
const skinName = document.querySelector("title").textContent;

let ind = document.querySelector(".item-extralinks > a").href.indexOf("search")
req += document.querySelector(".item-extralinks > a").href.slice(ind + 7)

let ref = `https://steamcommunity.com/market/listings/${appid}/` + document.querySelector(".item-extralinks > a").href.slice(ind + 7);
console.log(req)

GM_xmlhttpRequest({
    method: "GET",
    url:req,
    headers: {
        "Content-Type": "application/json"
    },
    onload: function(req){
        let res= JSON.parse(req.response)
        document.querySelector("body > div.content > section > div.left.inner > div.item-page > div.item-page-right > div.item-extralinks").insertAdjacentHTML("afterend", `<div style="
text-align: center;
margin: 1rem 0 1rem 0;
"><span style="font-size:20px;font-weight: bold;">Steam lowest price : </span><a href="${ref}" target="_blank" style="font-size:20px">
${res.lowest_price || "Price unavailable"}
</a></div>`)
    },
    onerror:function(e){
        console.log(e)
    }
});