You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allredirects garcontinue="Настройка_postback_для_Arbitrage.top|602" />
  </query-continue>
  <query>
    <pages>
      <page pageid="153" ns="0" title="Создание кампании с оплатой по данным Яндекс Метрики и Google Analytics" />
      <page pageid="162" ns="0" title="Добавление VK-message" />
      <page pageid="1858" ns="0" title="Create a teaser" />
      <page pageid="1859" ns="0" title="Create a banner" />
      <page pageid="1860" ns="0" title="Create Push" />
      <page pageid="1861" ns="0" title="Create a Push" />
      <page pageid="1862" ns="0" title="Create a Banner" />
      <page pageid="1863" ns="0" title="Creating Popunder" />
      <page pageid="1864" ns="0" title="Creating a Popunder (New UI)" />
      <page pageid="1865" ns="0" title="Site Statistics" />
    </pages>
  </query>
</api>