The key is public by nature — it travels in the page source. It only works on media5.com.ua: a request from anywhere else is served, but never counted.
pk_63fdaf84f77a458cc1a99f8c
<script src="https://relay.mib.news/w.js" data-key="pk_63fdaf84f77a458cc1a99f8c" data-count="4" async></script>