ATMs can be found in bigger towns, while the only cambios (authorized foreign currency exchanges) are in Cayenne. Credit cards are widely accepted
French Guiana uses the euro. The only cambios for currency exchange are in Cayenne, but ATMs are found in most mid-sized to large towns.
Credit cards are widely accepted, and you can get Visa or MasterCard cash advances at ATMs, which are on the Plus and Cirrus networks. Eurocard and Carte Bleu are also widely accepted.