Indicative rates, not an offer.
The Costa Rican colón (CRC) is the national currency, and US dollars are accepted in many hotels, tour agencies and shops, so both circulate side by side. San José has the most offers, followed by Alajuela, Heredia, Cartago and Liberia.
Banks exchange currency in their branches, and exchange desks operate at the international airports. Listings let you swap USDT or USDC for colones or dollars in cash.