Where can one find the base rate for US postage rates to Japan?

To find the current base rate for US postage rates to Japan, you can refer to the official website of the United States Postal Service (USPS):

1. Go to the USPS website: www.usps.com.

2. In the "Search" or "Quick Tools" section, type "International Rates" or "Rates to Japan" and click on the relevant option.

3. You will be directed to a page with information about international postage rates. Select "Japan" from the list of countries.

4. The base rate for sending a letter or postcard to Japan will be displayed, along with additional information about weight restrictions, delivery times, and other postal services.

For up-to-date and detailed information, I recommend visiting the USPS website or using their online postage calculator tool to get the most accurate rates based on the type of item you are sending, its weight, and the desired shipping method.