A cryptocurrency exchange or a digital currency exchange (DCE) is a business that allows customers to trade cryptocurrencies or digital currencies for other assets, such as conventional fiat money or other digital currencies. A cryptocurrency exchange can be a market maker that typically takes the bid-ask spreads as a transaction commission for is service or, as a matching platform, simply charges fees.
List of Top 25 Exchanges according to Coinmarketcap, 4th April, 2019:-
| # | Name | Launched |
| 1 | OKEx | Jan 2014 |
| 2 | DigiFinex | Apr 2018 |
| 3 | Binance | Jul 2017 |
| 4 | Coineal | Apr 2018 |
| 5 | Huobi Global | Sep 2013 |
| 6 | BW.com | Jan 2017 |
| 7 | Bit-Z | Jun 2016 |
| 8 | LBank | Oct 2017 |
| 9 | BitForex | Jun 2018 |
| 10 | IDAX | Dec 2017 |
| 11 | ZB.COM | Nov 2017 |
| 12 | Fatbtc | May 2014 |
| 13 | CoinBene | Sep 2017 |
| 14 | HitBTC | Feb 2014 |
| 15 | CoinTiger | Dec 2017 |
| 16 | BitMart | Mar 2018 |
| 17 | BITKER | May 2018 |
| 18 | OEX | Sep 2017 |
| 19 | BCEX | Aug 2017 |
| 20 | Upbit | Oct 2017 |
| 21 | Bitfinex | Oct 2012 |
| 22 | Bibox | Nov 2017 |
| 23 | Coinbase Pro | May 2014 |
| 24 | CoinEgg | Mar 2017 |
| 25 | RightBTC | Jul 2014 |
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