Mainland Chinese individuals who wish to buy Bitcoin in the United States have several options available to them. Here are some ways they can purchase Bitcoin while in the U.S.:

1. Use a Cryptocurrency Exchange: Mainland Chinese individuals can open an account with a cryptocurrency exchange that allows them to buy Bitcoin with fiat currency. Some popular exchanges that cater to international users include Coinbase, Binance, and Kraken. These exchanges typically require users to undergo a verification process and link their bank account to deposit funds.

2. Peer-to-Peer Platforms: Mainland Chinese buyers can also use peer-to-peer platforms such as LocalBitcoins or Paxful to buy Bitcoin from sellers in the United States. These platforms allow users to connect with other individuals who are looking to buy or sell Bitcoin and facilitate the transaction through an escrow service.

3. Bitcoin ATMs: Mainland Chinese individuals can also use Bitcoin ATMs located in the United States to purchase Bitcoin with cash. These ATMs allow users to deposit cash and receive Bitcoin in return. However, Bitcoin ATMs may charge higher fees compared to online exchanges.

4. OTC Desks: Over-the-counter (OTC) desks cater to high-net-worth individuals and institutional investors looking to buy large amounts of Bitcoin. Mainland Chinese buyers can contact OTC desks such as Genesis Trading or Cumberland to inquire about purchasing Bitcoin in the United States.

5. Gift Cards and Vouchers: Mainland Chinese buyers can also purchase Bitcoin using gift cards or vouchers from platforms like Bitrefill. Users can buy gift cards with fiat currency and redeem them for Bitcoin on the platform.

It is important to note that regulatory requirements and restrictions may apply to mainland Chinese individuals looking to buy Bitcoin in the United States. It is advisable to conduct thorough research and ensure compliance with relevant laws and regulations before proceeding with any Bitcoin purchase.