The United States is a contracting party to the 1965 Hague Service Convention, which means judicial documents can be transmitted through the United States' designated Central Authority rather than through slower diplomatic channels. Under the Convention, a Central Authority in the United States receives the request, arranges for service under its own domestic procedure, and returns an official certificate confirming the outcome. It's a more standardized process than diplomatic Letters Rogatory, though it still typically takes several months and follows the United States' own requirements around translation, fees, and documentation.
In practice, this means providing the original documents, any translations the United States' Central Authority requires, and a clear description of the case, then waiting for that authority to complete service under whichever method its domestic law permits — often personal delivery or service through a local court. Because the process runs through an official government channel, the resulting certificate of service is generally well recognized by U.S. courts, even though it can take longer than a domestic delivery would. For a broader look at how the available channels compare, see our guide to international service of process.