State-owned stores and institutions (e.g., Etecsa for SIM cards in Havana) often do not accept cash (USD, EUR, CUP) for major purchases, preferring bank cards. MIR cards may be accepted but success rates vary by the issuing bank and specific terminal. Private vendors and some state-sector entities in tourist areas (e.g., Varadero) are more likely to accept cash, especially USD, sometimes even informally (transactions 'off the books'). The unofficial exchange rate for USD to CUP can be tracked on sites like ElToque and is significantly higher than the official rate (e.g., 270 to 660 CUP per USD in recent times). It is highly recommended to carry a substantial amount of USD cash. For digital nomads or those with crypto, USDT can be exchanged for local currency with a slight premium (1:1 to 1:1.05), which is advantageous compared to other Latin American countries where a loss of 5% or more is common.
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