The Robinhood mobile trading app:

• Zero-fee BTC and ETH trading
• Monitoring the market by stabilizing prices of 16 different cryptocurrencies even without access to the actual trading feature
• A feed which discusses cryptocurrency markets, trends and news online.

For now Robinhood has attained :

• A total number of 4 million users
• Over $100 bln in transaction volume on its brokerage platform and over $1 bln in saved commissions in equity trades.