The bank sold $30.5 million to 1,017 bureaux de change agents, excluding around 1,801 others from its weekly sale. Wednesday's sale was lower from the $84.5 million it offered two weeks ago.
On the official interbank market, the naira traded at 199.47 at 1139 GMT, close to a rate at which it has been pegged since February.
Nigeria's dollar reserves shed 1.1 percent in a week to $29.59 billion as of Dec. 7, central bank data showed on Wednesday.