When it comes to White label Bitcoin exchange software these are the mandatory features to be integrated:
IEO launchpad
Security Token Exchange
Admin Console
Margin Trading
Payment gateway 
Admin Swaps
Crypto Wallet integration
Liquidity 
Trader console
Cryptocurrency price ticker

These features can also be more secured Customized as per business requirements!!

For more queries contact via: [email=hello@coinsclone.com]hello@coinsclone.com[/email] or Whatsapp: +91 9500575285.