Install I2P

In nixos there are two packages: i2p and i2pd. Lets use the c++ version.

$ nix-shell -p i2pd

And now run it with http proxy enabled

$ i2pd --httpproxy.enabled 1

Finally test it is running (4444 is the port for http)

$ curl --proxy http://127.0.0.1:4444 http://jynrjzdp5qajf2jsdif6bgpijuk72zmuiohq3o7omeksw4pdgejq.b32.i2p