As of now, there are no specific virtual currency exchanges based in Port of Spain, Trinidad and Tobago that are considered the largest in the country. However, there are a few popular international virtual currency exchanges that are widely used by individuals in Trinidad and Tobago to buy, sell, and trade cryptocurrencies.

Some of the popular virtual currency exchanges that cater to Trinidad and Tobago residents include:

1. Binance: Binance is one of the largest and most well-known virtual currency exchanges in the world. It offers a wide range of cryptocurrencies for trading and has a user-friendly interface that makes it easy for beginners to get started.

2. Coinbase: Coinbase is another popular virtual currency exchange that is widely used by individuals in Trinidad and Tobago. It is known for its security features and ease of use, making it a popular choice for newcomers to the world of virtual currency trading.

3. Kraken: Kraken is a popular virtual currency exchange that offers a wide range of cryptocurrencies for trading. It is known for its strong security features and low fees, making it a popular choice for more experienced traders.

While there may not be any specific virtual currency exchanges based in Port of Spain, Trinidad and Tobago, residents of the country can still easily access and use popular international exchanges like Binance, Coinbase, and Kraken to trade cryptocurrencies. It is important for individuals to conduct their own research and choose a virtual currency exchange that best meets their needs in terms of security, fees, and available cryptocurrencies.