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IDEX is a cryptocurrency exchange that was launched early last year. The exchange aims to offer users the experience of a centralized exchange that boasts the security benefits of a decentralized platform. The exchange provides a peer-to-peer trading environment. It also uses smart contracts to relay transactions over the Ethereum blockchain, and this allows the order book of your account to be updated in real-time.
Instant Bitex has ceased its operation. It was founded in 2018. The website and services of Instant Bitex are currently offline. 
CredoEx was introduced to the market by BitBounce in 2018. At the moment, the company’s website is down and Twitter media has not been updated since mid-2019