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Digital assets and currencies

Understand assets, networks and trading mechanics with sources you can check.

Trading basics

CharlieCard

The CharlieCard is a contactless smart card used for fare payment for transportation in the Boston area. It is the primary payment method for the Massachusetts Bay Transportation Authority (MBTA) and several regional public transport systems in the U.S. state of Massachusetts. It is used on the MBTA's subway and bus services, but is not currently accepted on the MBTA Commuter Rail and MB

Trading basics

Copper Card

The Copper Card is a contactless smartcard fare collection system used by Valley Metro in Metro Phoenix, Arizona. The Copper Card and the Valley Metro mobile app are accepted on Valley Metro Rail & Streetcar and Valley Metro Bus services.