[3np]

Looked it up.

https://www.treasurydirect.gov/indiv/help/TDHelp/faq.htm#Ope...

> In order to open a TreasuryDirect account, an individual or entity account manager must have a valid Social Security Number (SSN), be 18 years of age or over, and be legally competent. An entity must have a valid SSN or Employer Identification Number (EIN). The account owner must also have a United States address of record and have an account at a U.S. depository financial institution that will accept debits and credits using the Automated Clearing House method of payment.

AFAIUI, getting an SSN from abroad as a non-US citizen/resident is not realistic.

[murderfs]

Ah, yeah, you're right. You can probably still buy them through a broker, though. Searching around a bit, it looks like you should be able to open an account with Schwab: https://international.schwab.com/