The key is public by nature — it travels in the page source. It only works on uatg.com.ua: a request from anywhere else is served, but never counted.
pk_f01f02c4633d37238833db25
<script src="https://relay.mib.news/w.js" data-key="pk_f01f02c4633d37238833db25" data-count="4" async></script>