PASMO is a highly versatile rechargeable IC card that covers nearly all major transit options in the Tokyo Metropolitan area and is part of a nationwide "mutual use" network. It is accepted on all Tokyo Metro and Toei Subway lines, as well as major private railways like Tokyu, Odakyu, Keio, Seibu, and Tobu. Crucially, it is also valid on JR East lines within Tokyo and the Tokyo Monorail to Haneda Airport. Beyond Tokyo, the nationwide integration allows you to use PASMO on buses and trains in cities like Osaka, Kyoto, Nagoya, and Sapporo. However, it cannot be used for continuous travel between different IC regions (e.g., you cannot tap in at Tokyo and tap out at Osaka). In 2026, PASMO remains widely used for "smart shopping" at vending machines and convenience stores across Japan, though "unregistered" physical cards are increasingly rare in favor of Mobile PASMO for smartphones.