Taipei's public transit card is the EasyCard.
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Taipei uses the EasyCard. The EasyCard covers the MRT, buses, and even YouBike bike-share — genuinely essential and also usable at convenience stores.
You can buy it at MRT stations or convenience stores.
Usually yes — it's typically faster than buying paper tickets and often cheaper per ride, even for just a couple of days.
In some cities you can tap a contactless card or phone directly, though it's worth checking current signage or the transit authority's site, since not every system supports it yet.