ticets ,passport.visa and all that is requred is done,then it is mentioned a $400 stamp is required befour you can board
Where are you coming from and leaving to? It depends on your country's restrictions. From Canada and the USA you can fly into Quito, get a tourist visa on the spot that lasts for $90 days. Some airports have a $40 fee (not $400) for flying out but that's often included in the ticket price.
If you are crossing the boarders by road you may also need a stamp in your passport but I don't think it's that much money.
Google your country + Ecuador + Visa to find out more. about 5 years ago