We present the first monitoring study aiming to characterize the usage of the I2P network, a low-latency anonymous network based on garlic routing. We design a distributed monitoring architecture for the I2P network and we show through a one week long experiment that we are able to identify 32% of all running applications, among web servers and file- sharing clients. Additionally, we identify 37% of published I2P applications, which turn out to be unreachable after its publication on the I2P distributed database.