In 2017, the U.S. Postal Service introduced Green Succulent, a Forever international rate stamp.
This Global Forever stamp can be used to mail a one-ounce letter to any country to which First-Class Mail International service is available.
As with all Global Forever stamps, this stamp will have a postage value equivalent to the price of the single-piece First-Class Mail International first ounce machineable letter in effect at the time of use.