If you're looking for outgoing requests, check out OpenSnitch. It should do exactly what you're looking for.

You are looking for an outbound firewall

Like the others recommended

OpenSnitch has multiple detection ways, eBPF might require activation in the kernel, there are others too, 4 in total

For me on NixOS it worked in eBPF and proc mode. NixOS' weird binary placement makes rules less secure I guess as it can only check commands (if it were nix-native it could use a function for that)

And I had tons of "unknown process"es which I needed to allow to not break things, which kinda makes the thing useless

@myotheraccount

#^https://github.com/evilsocket/opensnitch

#^https://safing.io/

You could drop all and use the log function to see all traffic denied