Are there services like this? What would be the fee for something like this?
We have such services in their numbers on the forum, do well to verify if you're trading with a genuine trader and not some scammer before sending them your coins.
To make things easier you can drop a request on my exchange service thread
BrainbossXchange Service {BTC/NGN Altcoins/BTC/Stablecoins}, and I'll gladly thread those coins for you and send you the coins of your choice.