Most nationalties need a visa.
Passport and visa required.
Visa for stay up to 36 months, requires a fee, 2 application forms, 2 photos, proof of yellow fever vaccination, proof of return/onward transportation (guarantee from employer, travel agency, or photocopy of round trip ticket) and letter of guarantee from bank.
Documentation requirements differ by embassy.
You will require the following;
A valid passport over the 60 days of the period of stay granted;
Two (02) photographs of identity;
And of course some money, $80 to $150
Visa information for Benin
If you are travelling to Benin, Burkina Faso, Cote d'ivoire, Niger and Togo you may apply for a Visa Touristique Entente which costs 25000cf (about (US$50). It covers all the above countries, is cheaper and less work than getting single visas for each country.