There are several cryptocurrency trading platforms available in Budapest, Hungary, where users can buy, sell, and trade various cryptocurrencies. Some of the popular platforms include:

1. CoinCash.eu: CoinCash is a cryptocurrency exchange platform that allows users to buy and sell Bitcoin, Ethereum, Litecoin, and other cryptocurrencies. They offer competitive fees and a user-friendly interface for trading.

2. Bitstamp: Bitstamp is one of the oldest cryptocurrency exchanges in the world and is popular among traders in Budapest. They offer a wide range of cryptocurrencies for trading and have a reputation for security and reliability.

3. Coinmama: Coinmama is a global cryptocurrency exchange that allows users in Budapest to buy Bitcoin and other cryptocurrencies using credit/debit cards. They have a user-friendly interface and offer competitive rates for buying and selling cryptocurrencies.

4. Binance: Binance is one of the largest cryptocurrency exchanges in the world and has a strong presence in Budapest. They offer a wide range of cryptocurrencies for trading, as well as advanced trading features for experienced traders.

5. Kraken: Kraken is a popular cryptocurrency exchange that is well-regarded for its security and reliability. They offer a wide range of cryptocurrencies for trading and have a user-friendly interface for both beginners and experienced traders.

These are just a few of the cryptocurrency trading platforms available in Budapest, Hungary. It is important for users to research and compare different platforms to find the one that best suits their trading needs and preferences. Additionally, users should always prioritize security and choose platforms that have a good reputation in the cryptocurrency community.