You can purchase USD-COIN from these places
Go to Binance
To provide users with more secure and convenient block-chain asset exchange services, polymerization of global high-quality block chain assets, is committed to creating a world-class block chain asset trading platform.
Go to Bitfinex
The largest and most advanced cryptocurrencies exchange
Go to IDEX
IDEX is the only Ethereum decentralized exchange with real-time trading and high transaction throughput.
Go to Poloniex
Welcome to Poloniex. We are a US-based digital asset exchange offering maximum security and advanced trading features.
Go to HitBTC
The most advanced cryptocurrency exchange to buy and sell Bitcoin, Ethereum, Litecoin, Monero, ZCash, DigitalNote, Ardor.
Go to Korbit
Trade Bitcoin & Ethereum. Transfer money globally. Korbit, Korea's leading digital currency exchange.
Go to BitBay
BitBay is a working real-world, fully-functional decentralized marketplace that allows you to buy and sell goods and services easily, securely, and anonymously.
Go to Mercatox
Go to OkEx