The I2P Project itself does not run any proxies to the Internet. The I2P software includes a default outproxy: exit.stormycloud.i2p. These are run by StormyCloud Inc.
https://stormycloud.orgBy default, I2P comes with one outproxy configured: exit.stormycloud.i2p.
From the very bottom of this page (assuming you downloaded the i2p Java implementation -- I have no idea about the C++ version).
If you Google "what's my ip?" then you should see something like "Your IP address is 144.172.118.151 in Spring, Texas, United States (77387)", which makes sense since StormyCloud Inc. is apparently based in Texas.