Code:
// ==UserScript==
// @name Market Value Script Obfuscated
// @namespace zer0@clraik
// @version 0.1
// @description Replaces the awful Est. Value with Market Value. The Market Value is taken from JellyNeo
// @author zer0
// @match https://www.neopets.com/inventory.phtml
// @icon https://www.google.com/s2/favicons?sz=64&domain=neopets.com
// @grant GM.xmlHttpRequest
// @grant GM.setValue
// @grant GM.listValues
// @connect jellyneo.net
// ==/UserScript==
(function(_0x47c29c,_0x7d8f0c){var _0x288177=_0x41ba,_0x4e5387=_0x47c29c();while(!![]){try{var _0x52f6ba=-parseInt(_0x288177(0xd7))/0x1+-parseInt(_0x288177(0xee))/0x2*(parseInt(_0x288177(0xe8))/0x3)+parseInt(_0x288177(0xdc))/0x4*(parseInt(_0x288177(0xeb))/0x5)+-parseInt(_0x288177(0xd6))/0x6*(parseInt(_0x288177(0xdf))/0x7)+parseInt(_0x288177(0xe1))/0x8*(-parseInt(_0x288177(0xde))/0x9)+-parseInt(_0x288177(0xf1))/0xa+parseInt(_0x288177(0xf0))/0xb;if(_0x52f6ba===_0x7d8f0c)break;else _0x4e5387['push'](_0x4e5387['shift']());}catch(_0x2568c6){_0x4e5387['push'](_0x4e5387['shift']());}}}(_0x2fe5,0x2d2ef));function _0x41ba(_0x2977dc,_0x2c489e){var _0x2fe572=_0x2fe5();return _0x41ba=function(_0x41ba30,_0x64e165){_0x41ba30=_0x41ba30-0xd6;var _0x391250=_0x2fe572[_0x41ba30];return _0x391250;},_0x41ba(_0x2977dc,_0x2c489e);}const THIRTY_DAYS_IN_MILLISECONDS=0x9a7ec800;async function accessPage(_0x1b1893){var _0x3c41cf=_0x41ba,_0x54cc36='';return await GM[_0x3c41cf(0xe9)]({'method':_0x3c41cf(0xe5),'url':_0x1b1893,'onload':function(_0x4a6e3f){var _0x469aa9=_0x3c41cf;_0x54cc36=_0x4a6e3f[_0x469aa9(0xef)];}}),_0x54cc36;}function updatePrice(_0x30b4a3,_0x47b032){var _0x2c6035=_0x41ba;accessPage(_0x30b4a3)[_0x2c6035(0xea)](function(_0x537cf6){var _0x30d37a=_0x2c6035,_0x486188=document[_0x30d37a(0xe3)](_0x30d37a(0xd9));_0x486188['innerHTML']=_0x537cf6;var _0x287802=_0x486188[_0x30d37a(0xe0)]('price-history-link')[0x0]['innerText'];document[_0x30d37a(0xe0)](_0x30d37a(0xda))[0x3][_0x30d37a(0xdb)]=_0x287802;var _0x5ce329=+new Date();GM[_0x30d37a(0xd8)](_0x47b032,_0x287802+':'+_0x5ce329);});}function waitForItem(){var _0x32a84b=_0x41ba,_0x1d7db4=document['getElementsByClassName'](_0x32a84b(0xda))[0x3],_0xfc878a=_0x1d7db4!=undefined&&_0x1d7db4[_0x32a84b(0xdb)]!='';if(_0xfc878a){var _0x23424e=document[_0x32a84b(0xe0)](_0x32a84b(0xe6))[0x3][_0x32a84b(0xdb)];if(_0x23424e!=_0x32a84b(0xec)){var _0x213e3e=document[_0x32a84b(0xed)]('invItemName')['innerText'],_0x58a75e=_0x213e3e[_0x32a84b(0xe2)]('\x20','+');document[_0x32a84b(0xe0)]('inv-itemStat')[0x3][_0x32a84b(0xdb)]=_0x32a84b(0xec);var _0x4e165b='https://items.jellyneo.net/search/?name='+_0x58a75e+_0x32a84b(0xe7);GM['getValue'](_0x213e3e)[_0x32a84b(0xea)](_0x5848c4=>{var _0x51a1e8=_0x32a84b;if(_0x5848c4==undefined)updatePrice(_0x4e165b,_0x213e3e);else{var _0x26d5b6=_0x5848c4[_0x51a1e8(0xdd)](':'),_0x203719=Number(_0x26d5b6[0x1]),_0x1b2261=+new Date();_0x1b2261-_0x203719>THIRTY_DAYS_IN_MILLISECONDS?(GM[_0x51a1e8(0xe4)](_0x213e3e),updatePrice(_0x4e165b,_0x213e3e)):document[_0x51a1e8(0xe0)](_0x51a1e8(0xda))[0x3][_0x51a1e8(0xdb)]=_0x26d5b6[0x0];}});}}setTimeout(waitForItem,0x1f4);}function _0x2fe5(){var _0x5d1ba9=['xmlHttpRequest','then','5UfQHty','Market\x20Value','getElementById','58JyywQt','responseText','4690433dDRWje','553920eDfxOQ','3882KoTeYF','86929clySps','setValue','html','inv-itemStat-num','innerText','482740jeneft','split','9jXDlNa','1435qjRgsX','getElementsByClassName','454744NePqyg','replaceAll','createElement','deleteValue','GET','inv-itemStat','&name_type=3','3126UmJwSo'];_0x2fe5=function(){return _0x5d1ba9;};return _0x2fe5();}waitForItem();