Basic travel allowance Nigeria

It is 0 dollars. There is no requirement for money in the bank, The request for this, comes from scammers who hook people on dating and other web sites who find someone, have them fall in love with.
Normally they have one girl who they use her photo and she appears on web cams for them, but they use dozens of other people who do the actual online chatting and emails. Often you can find that because of small changes in ways of writing.

But no, if they are asking for it, you know it is a scam. I hope you did not send money for passport and visa ( they are @ a total of 300 dollars)