Quebec City's public transit card is the OPUS card (RTC network).
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Quebec City uses the OPUS card (RTC network). The OPUS card covers Quebec City's RTC bus network — there's no metro/subway system here.
You can buy it at bus terminals or select pharmacies.
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.