Nigeria Banks USSD code
In alphabetical order;

Access Bank — *901#
EcoBank— *326#
Fidelity Bank — *770#
First Bank — *894#
First City Monument Bank (FCMB) — *389*214#
Guaranty Trust Bank (GTB) — *737#
Heritage Bank — *322*00#
lotus Bank — *389*301#
Keystone Bank *7111# —
Polaris Bank *833#—
Stanbic IBTC Bank *909#—
Sterling Bank — *822#
United Bank for Africa (UBA) — *919#
Union Bank — *826#<
Unity Bank — *7799#
WEMA Bank — *945#
Zenith Bank — *966#
Taj bank
Diamond bank
Globus Bank
Accion Bank

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You can become an online banking tip blog.
Blog about fraud trends and how to avoid. Interest rates, banking news, bank jobs, reputable ecommerce platforms(not all are genuine), about services offered, agric friendly banks, commerce friendly banks and more.
Bank app ratings and loopholes. Better than blogging sextapes and baseless rumours.