Seems like Binance is acting faster than Nigerian Banks:
https://www.coindesk.com/binance-suspends-deposits-in-nigeria-following-central-bank-directive

The news is one day old but I don't see any serious change in the volume pairs, except for the USDT/NGN, change that for me makes little sense right now, why the dump?
hhttps://www.binance.com/en/trade/USDT_NGN