Not seeing all traffic incoming from a website in the inspector under the network tab?

So when I go to a website like, say https://coinmarketcap.com (that displays the prices of cryptocurrencies), in my Chrome Browser, it looks like I dont see all activity going on in the inspector under the Network tab.

Here is a screenshot to visualize the website:

I see the prices are updated live on the website (without refreshing), but I don't see any activity in the Network inspector.

There is of course activity when I load the page for the first time, but nothing after that even tho the website dynamically updates the prices? My firsts thought was, that it could be fake updates via a JS script on the client-side, but there are many websites I know where you can't see this, so what's going on here? What types of protocols are used to achieve this, because I know that WebSockets and polling (xhr) always shows up.

A screenshot of the network inspector, just be clear what I mean by that (showing traffic for the first 50 ms (loading time) and then nothing afterwards)