BCoin.sg was a centralized cryptocurrency exchange based in Singapore. The exchange was launched in 2018. 
Deposits were free on the exchange. Margin trading option was not available on the exchange. 
At the moment the exchange doesn’t work and there is no official information about when the exchange will be active again. All the official pages of the platform are down as well, including Twitter and Facebook. We will update information about the exchange as soon as it is active again. 

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

Cryptopia exchange was closed after a theft that took place in early 2019. Cryptopia was established in New Zealand in 2014. Its website had been publishing updates on the liquidation process until the mid-2019. 

CPDAX was established in 2017 and stands for the “Coinplug Digital Asset Exchange”. It accepts KRW (Korean Won) deposit and withdrawal. This exchange is the development of the Coinplug blockchain technology company.

In March, 2020 GuldenTrader exchange has published an announcement calling its customers to withdraw their funds before April 1, when the exchange will cease its operation.

In 2019, Coinroom has filed an application for bankruptcy with the last notice on their website published as of September 30. It was reported that this Polish exchange disappeared with customers’ funds.

CoinTiger is incorporated under the laws of the Republic of Singapore and works as a centralized exchange. It offers BTC, ETH, USDT, TRX, XRP markets, as well as trading pairs against bitCNY token.

BiteBTC is currently an inactive provider of crypto exchange services. It claimed to have a registration from Singapore. Later on, in January of 2019, BiteBTC failed to meet its obligations under the pretext of the fire in their data center. Customers’ accounts were frozen. It is further reported that the persons behind BiteBTC opened Fedlio exchange, which refused to redeem liabilities of BiteBTC. 

Bidesk exchange is a digital asset trading platform that has been built to provide a secure and safe environment for trading high quality tokens and coins whilst providing the best user experience to its users.

Dex.top is a decentralized cryptocurrency trading platform offering trading with smart contracts (including but not limited to Ethereum, EOS and NEO). The platform describes itself as World’s First Multi-Chain Decentralized Exchange and claims to have top volume among other decentralized exchanges. 

Bitibu was established in 2018 as a centralized cryptocurrency exchange.
As of now, this platform is not active.

Coinmama is a platform providing users with an opportunity to quickly buy cryptocurrencies with a credit card, Apple Pay, or via wire transfer. The registration doesn't take much time and the interface is quite intuitive. Coinmama isn't suited well for regular trading as the fees on the platform are quite high. So basically, Coinmama is good for buying cryptocurrencies for the first time. In this article, we will answer the most vital questions concerning the use of the service: is it safe to use Coinmama? Is Coinmama a scam? What are the fees on the platform? What are the main features of the platform? What is needed to sign up for Coinmama? And others...

The exchange was closed in 2019 with the preliminary notice informing about suspension of trading and deposit. Withdrawals had been operational for a couple of months since that time till December 1, 2019. The team explained the termination of activity by business reasons.

Update: The exchange is closed.
CampBX is a platform where you can buy and sell Bitcoins in real-time from other CampBX users. Your buy or sell orders are matched against a parameterized database of other orders. If a perfect match is found, a Bitcoin-to-USD trade is executed instantly. If there are no matching orders at the price you specified, then your order can remain open for up to 31 days. To maintain fairness in trading, the CampBX platform has taken a purely-platform approach and CampBX is never a counter-party to any trade. 

Cryptonex is a centralized cryptocurrency exchange launched in 2017. Its reported volume is about 250007314 $ as of 8 October 2019. Cryptonex has 18 available trading pairs and 8 coins. Deposits are free on the exchange. Cryptonex has fiat deposits option. Margin trading option is not available on the exchange. Cryptonex is quite active in social media, with more than 25000 Twitter followers. You can leave your review about Cryptonex here.

CoinZest exchange was founded in South Korea in 2018, maintaining deposit and withdrawal of fiat currency, Korean Won. At the point, the company’s website is down and Twitter media has not been updated since October, 2019.

Coinnest was closed in June 2019 as per the announcement made in advance so that customers could withdraw their assets. There is information that the exchange has made errors in airdrops before.

CRXzone is the brand name for crypto exchange and merchant payment gateway. Trading pairs available with CRXzone include fiat currencies: USD (US dollar) and SGD (Singapore dollar). The exchange aims to provide deep liquidity.

DOBI is a digital asset trading platform. Apart from the English version, the website has also Chinese and Portugese versions. 

QuadrigaCX is a Centralized cryptocurrency exchange based in the Canada. The exchange was launched in 2013. Its reported volume is about 0 $ as for 8 October 2019.
QuadrigaCX has 0 available trading pairs and 0 coins. Deposits are Depends on currency and volume on the exchange.
QuadrigaCX have Fiat...