[dk4rest]

Shameless plug: I made an HTTP(S) debugging tool for macOS[0]. Not exactly like what OP does, but if you are looking for a native alternative to Fiddler on macOS, consider giving it a try.

[0] https://proxie.app/

[wingi]

This looks more as a Charles replacement than intercept

[patr0nus]

You are right. Charles is a great tool and I used it everyday.

However, besides not being native, I really missed the scripting ability that Fiddler has. This is another major motivation for me to build this tool.