Hello,
I checked the docs of Vault but didn’t find a way to buy/sell crypto-asset through API, Please tell how can I get access to my account trading through API.
Refer to HollaEx API Docs https://apidocs.hollaex.com
You can use same apis on your exchange by just changing the domain to your own domain. You might find this library useful as well: https://www.npmjs.com/package/hollaex-node-lib