This is the most economical option if you're spending a few days in the Russian capital. The card can be purchased and recharged at various station machines or even with the special Moscow Metro application. Your balance can be checked on the app or in the small yellow terminals inside the metro stations. A trip works out at ₽ 42 (US$ 0.60), but if you change transport within 90 minutes, you'll only pay ₽ 23 (US$ 0.30) for the next trip.
The day ticket for the Moscow metro can be purchased at any of the stops in the city. The price is ₽ 265 (US$ 3.80) per day and ₽ 500 (US$ 7.20) for three days.
The most convenient card if you want to take several types of transport within an hour and a half period. It costs ₽ 65 (US$ 0.90) per person and allows one metro ride and an unlimited number of trips on other types of public transport in Moscow during the time of its duration.