As of now, there are not many cryptocurrency trading platforms in Ulaanbaatar, Mongolia. However, there are a few platforms that are commonly used by cryptocurrency traders in the country. Some of the popular cryptocurrency trading platforms in Ulaanbaatar, Mongolia include:

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

2. Huobi: Huobi is another popular cryptocurrency exchange that is widely used by traders in Mongolia. It offers a variety of cryptocurrencies for trading and has advanced trading features for experienced traders.

3. OKEx: OKEx is a cryptocurrency exchange that offers a wide range of cryptocurrencies for trading. It has a user-friendly interface and provides various trading tools for traders.

4. Coinbase: Coinbase is a well-known cryptocurrency exchange that is popular among beginners and experienced traders alike. It offers a simple and easy-to-use platform for buying, selling, and trading cryptocurrencies.

5. Kraken: Kraken is a cryptocurrency exchange that is known for its high security standards and strong customer support. It offers a variety of cryptocurrencies for trading and has advanced trading features for experienced traders.

These are some of the popular cryptocurrency trading platforms in Ulaanbaatar, Mongolia. It is important to research and choose a platform that meets your trading needs and offers a secure and reliable trading experience. Additionally, it is recommended to follow all regulations and guidelines related to cryptocurrency trading in Mongolia to ensure a safe and legal trading experience.