Hi. I notice that the createUserCryptoAddress method in network-lib sends a request to ${this.baseUrl}/network/${this.exchange_id}/create-address?user_id=${userId}&crypto=${crypto} but I can’t figure out where is the network endpoint and how can I handle its requests? Is it close source?
It has network as a query string as well.
The following code is from the network library:
let path = `${this.baseUrl}/network/${this.exchange_id}/create-address?user_id=${userId}&crypto=${crypto}`;
if (opts.network) {
path += `&network=${opts.network}`;
}
I’m looking for a controller to handle incoming requests to /v2/network route. Where can I find it? 
Is that related to your previous question?
actually, my main question is that 
I want to know how a crypto address is created and where is stored?
That function you sent earlier creates the wallet address. You can get them using GET /user under wallet object.
Yes, but how does it create the wallet address? Is it created in the Hollaex network? createUserCryptoAddress sends a request to ${this.apiUrl}${path} which the path is ${this.baseUrl}/network/${this.exchange_id}/create-address?user_id=${userId}&crypto=${crypto}. Now I want to know where is the ${this.baseUrl}/network/ handler?
Yes its in the HollaEx Network.