Additionally, they list a phone number of +1 (888).330.4117 and a support email address of email@example.com. That phone number is also for support, although it isn’t identified as such on the Coinbase.com website, but it is on the support.coinbase.com website. In addition to that U.S./International phone number, there is a United Kingdom phone number of (888).330.4117 listed on the Coinbase support website. The User Agreement specifies the first method of contact should be through the support.coinbase.com platform. This is best for general questions and feedback. They also request you provide your name and address, as well as any other information that might be required to identify you, which might include your Coinbase account and the transaction about which you have a question. If there is a security, privacy, or unauthorized access issue, the Coinbase User Agreement recommends you call Customer Support at +1 (888).330.4117 . It’s notable that if you have a legal document that needs to be served against Coinbase, it must go through their registered agent. A list of offices in each state can be found here.