Poloniex is a cryptocurrency exchange that was founded in January 2014 by Tristan D'Agosta. The exchange was initially launched as a platform for trading alternative cryptocurrencies, also known as altcoins. However, it has since expanded to include trading in major cryptocurrencies such as Bitcoin, Ethereum, and Litecoin. Poloniex quickly gained popularity among cryptocurrency traders due to its user-friendly interface and wide range of trading pairs.

Poloniex is headquartered in Wilmington, Delaware, in the United States. The exchange has a global user base and is available in over 100 countries. Poloniex has a team of experienced developers and security experts who work tirelessly to ensure the safety and security of user funds. The exchange has also implemented various security measures such as two-factor authentication and cold storage to protect user assets.

In 2018, Poloniex was acquired by Circle, a global financial technology firm. The acquisition was aimed at expanding Circle's offerings in the cryptocurrency space and providing Poloniex with additional resources to improve its platform. Since the acquisition, Poloniex has continued to grow and has introduced new features such as margin trading and lending. The exchange has also expanded its customer support team to provide better assistance to its users. Overall, Poloniex remains a popular choice for cryptocurrency traders due to its reliable platform and wide range of trading options.