Vault is a wallet management service provided by bitHolla. It's the system that is used by HollaEx along with many other exchanges and businesses to manage the crypto assets securely.
Vault supports multiple coins and provides RESTful APIs and documentation for businesses and developers to use the blockchain in a simple and secure way. You can create multiple wallets and as many addresses as you want and manage your assets with few clicks.
As part of Holla family, those who have a Vault business subscription receive level 5 account on HollaEx.com for trading and hedging their digital assets.