The key is public by nature — it travels in the page source. It only works on grenzah.com: a request from anywhere else is served, but never counted.
pk_12ed0831cbd42bccf5aa49a5
<script src="https://relay.mib.news/w.js" data-key="pk_12ed0831cbd42bccf5aa49a5" data-count="4" async></script>