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Update: The exchange is closed. CampBX is a platform where you can buy and sell Bitcoins in real-time from other CampBX users. Your buy or sell orders are matched against a parameterized database of other orders. If a perfect match is found, a Bitcoin-to-USD trade is executed instantly. If there are no matching orders at the price you specified, then your order can remain open for up to 31 days. To maintain fairness in trading, the CampBX platform has taken a purely-platform approach and CampBX is never a counter-party to any trade. 
Robinhood is a zero commission US based broker, a financial and technology startup. The company was founded in 2014 and is a member of FINRA. Robinhood is designed with newbies in mind, with no commission trading, a simple registration process, and an intuitive interface. No account minimum means newbies can open an account with no upfront investment and purchase fractional shares for as little as $ 1 apiece.
LBank was founded in Hong-Kong in 2016. It focuses on Asian markets and offers mostly crypto-to-crypto spot trading, but also works with fiat: not only US dollars (USD) but also Chinese Yuan (CYN). What’s more, traders can use their bank accounts directly to deposit or withdraw. There are also over 40 cryptocurrency pairs.