Indicative rates, not an offer.
The Malagasy ariary (MGA) is the national currency; euros are the most exchanged foreign currency, followed by US dollars. Antananarivo has the most offers, followed by Toamasina, Antsirabe, Mahajanga and Nosy Be.
Banks and exchange bureaus operate in the capital and tourist centres, and it is wise to exchange enough before travelling to remote areas. In Madagascar, listings are a way to swap Malagasy ariary and US dollars directly with another person.