In the Chilean city of Antofagasta, there are several cryptocurrency trading platforms that residents can use to buy, sell, and trade digital currencies. Some of the popular platforms in Antofagasta include:

1. Buda: Buda is one of the largest cryptocurrency exchanges in Latin America and has a strong presence in Chile. Users in Antofagasta can easily sign up for an account on Buda and start trading a variety of cryptocurrencies, including Bitcoin, Ethereum, and Litecoin.

2. CryptoMarket: CryptoMarket is another popular cryptocurrency exchange in Chile that allows users to buy and sell digital currencies with ease. The platform offers a user-friendly interface and supports a wide range of cryptocurrencies for trading.

3. Orionx: Orionx is a Chilean cryptocurrency exchange that offers a secure and transparent trading environment for users in Antofagasta. The platform supports popular cryptocurrencies like Bitcoin, Ethereum, and Ripple, and allows users to trade with low fees.

4. LocalBitcoins: LocalBitcoins is a peer-to-peer cryptocurrency exchange that connects buyers and sellers in Antofagasta for direct trades. Users can choose their preferred payment methods and negotiate prices with other traders on the platform.

5. Coinmama: Coinmama is a global cryptocurrency exchange that allows users in Antofagasta to buy Bitcoin and other digital currencies with a credit card or bank transfer. The platform is known for its user-friendly interface and high level of security.

Overall, residents in Antofagasta have a variety of options when it comes to cryptocurrency trading platforms. Whether they prefer a local exchange like Buda or a global platform like Coinmama, there are plenty of choices available for buying and selling digital currencies in the city.