The key is public by nature — it travels in the page source. It only works on harper.com.ua: a request from anywhere else is served, but never counted.
pk_42e9902d0e49b21087160d9c
<script src="https://relay.mib.news/w.js" data-key="pk_42e9902d0e49b21087160d9c" data-count="4" async></script>