. We have rated NGN99 as a good betting site which is generally a good site to enjoy, but there are some notes that you might need to pay. How much is 3 Tether (USDT) in Nigerian Naira (NGN) by the latest current exchange rate? 3 Tether (USDT) = 3, Nigerian Naira (NGN). (Tether). Selling Tether you get , Nigerian Naira at 17 January , Wednesday GMT. USDT, = , NGN.