IOTA is an open source distributed ledger without fees while secures transactions. IOTA does not use blockchain, while is taking advantage of the fact that the bigger a blockchain is, more mining power and slower processing is needed for a transaction verification and confirmation.
Bitfinex is a centralized cryptocurrency exchange owned and operated by iFinex Inc. The members area provide secure and fast functions like quick transfer and cryptocurrency conversions. Client can earn staking rewards for several cryptos like Cardano, Tron, Tezos, Cosmos, Kusama, Polkadot and others with respective percentages (%) as estimated annual staking rewards.
Bittrex Global is the most trusted cryptocurrency exchange known for its next-level security. Users can buy bitcoin and other cryptocurrencies like Cardano, Cosmos, Ethereum, etc using credit or debit card as available payment method. The firm is US based, hence US investors are welcome to open an account.
Hoo exchange is the world's leading digital assets service platform. Headquartered and registered in Hong Kong, Hoo offers more than the standard financial services in regards of cryptocurrency and digital assets (e.g. cryptocurrency trading, crypto exchange, etc). Hoo moved one step ahead from other competitors, providing also mining services with a unique and pioneer service center for cryptocurrency mining.
Huobi cryptocurrency exchange is a global cryptocurrency leader since 2013. You can quick buy and sell crypto locally. The company offers easy access to 348 cryptos with 57 local currencies and 60 payment methods. The ability to offer various funding options make Huobi one of the best cryptocurrency exchange to quickly buy digital assets, especiallty for crypto beginners.
OKEx offers a fully customizable Bitcoin and cryptocurrency exchange for traders at every level. Basic trading mode is provided for beginners for spot and simple options. For more advanced traders a margin trading platform mode is provided with perpetual, Futures and Options with up to 100x leverage. Clients can store their crypto and earn interest using several methods.