Poloniex is a US-based digital asset exchange, founded in 2014.
On Poloniex, users can trade Bitcoin (BTC), Ethereum (ETH), Monero (XMR) and Tether (USDT).
Security: The vast majority of customer deposits are stored offline in air-gapped cold storage. Poloniex only keep enough online to facilitate active trading, which greatly minimizes risk and exposure. Any funds a client puts into the exchange are only used to facilitate trading through the client’s account. Poloniex do not operate on fractional reserves.
Fees: Poloniex employs a volume-tiered, maker-taker fee schedule. Maker fees vary between 0% and 0.15% depending on volume. Taker fees vary between 0.05% and 0.25% depending on volume