Kasouwa Matta is one of Maradi's most useful market areas to wander, a place for cloth, food, household goods, and the practical buying and selling that keeps the city moving. It is not polished, and that is the point: Maradi's appeal lies in the way trade fills the streets.
Go in the morning, carry small CFA notes, and bargain with patience rather than theatre. The market is busy and exposed, so keep valuables tucked away and drink plenty of water before you get heroic about exploring every lane.