As of now, there are very few web3 exchanges in the United States that have obtained licenses to operate legally. The regulatory environment for cryptocurrency exchanges is still evolving, and many exchanges are still in the process of obtaining the necessary licenses to operate in compliance with US laws and regulations.

One of the most well-known web3 exchanges in the United States that has obtained licenses is Coinbase. Coinbase is a fully regulated and licensed cryptocurrency exchange that operates in compliance with US laws and regulations. It holds licenses from the US Financial Crimes Enforcement Network (FinCEN) as a money services business, as well as licenses from various states to operate as a money transmitter.

Another web3 exchange that has obtained licenses in the United States is Gemini. Gemini is a cryptocurrency exchange and custodian that is regulated by the New York State Department of Financial Services (NYDFS). It holds a BitLicense from the NYDFS, which allows it to operate legally in the state of New York.

Other web3 exchanges in the United States, such as Kraken and Bittrex, are also working towards obtaining the necessary licenses to operate legally in the country. These exchanges are actively engaging with regulators and working to comply with US laws and regulations in order to provide a safe and secure trading environment for their users.

Overall, while there are a few web3 exchanges in the United States that have obtained licenses, the regulatory landscape for cryptocurrency exchanges is still complex and evolving. It is important for users to do their own research and ensure that they are using a licensed and regulated exchange to protect their funds and comply with the law.