Pointe-Noire, Congo (Brazzaville) does not have a significant presence in the cryptocurrency exchange market compared to other countries or cities. However, there are a few popular cryptocurrency exchanges that residents in Pointe-Noire may consider using to buy, sell, and trade digital assets.

1. Binance: Binance is one of the largest and most well-known cryptocurrency exchanges in the world. It offers a wide range of cryptocurrencies for trading and has a user-friendly interface.

2. Coinbase: Coinbase is another popular cryptocurrency exchange that is known for its ease of use and security features. It allows users to buy, sell, and store a variety of cryptocurrencies.

3. Kraken: Kraken is a US-based cryptocurrency exchange that has been in operation since 2011. It offers a wide range of trading pairs and has a strong focus on security.

4. Bitstamp: Bitstamp is one of the oldest cryptocurrency exchanges in the world, having been founded in 2011. It offers trading in a variety of cryptocurrencies and has a reputation for being reliable and secure.

5. Bittrex: Bittrex is a US-based cryptocurrency exchange that offers a wide range of trading pairs and has a strong focus on security. It is popular among traders who are looking for a reliable and secure platform.

While these exchanges are popular globally, it is important to note that residents in Pointe-Noire may face challenges in accessing these platforms due to regulatory restrictions or limitations on banking services. It is recommended to research local regulations and consider using peer-to-peer platforms or local cryptocurrency exchanges that cater to the Congolese market.