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OMGfin is the pioneer in building a trading system for digital assets focused on young investors and social network.
Coinigy is a great platform that gives you the ability to combine all of your wallets and exchange accounts in one interface using API keys from all different exchanges. The platform was founded in 2014 by a group of dedicated developers, traders, analysts, and evangelists that believe in the global crypto-financial industry.  
BestRate is a technology company that builds the crypto processing API for the internet.