I might be Getting Scammed, Plz Help

Hey Guys, Im Selling Something on Ebay for 175.00, its been up for three days, and then someone bought it, but the Weird thing is that when i created the Sale, i said id only ship to the US, I got an Email from the Buyer and The Transaction to Pay Pal Was 475.00, thats a lot more than what i put it up for,(Btw, he was the Only Bidder) he says he lives in the States, but his Shipping info is for some Address in Nigeria. Am i Getting Scammed or is the Buyer Just Stupid?

Well, what did u put up for auction

it depends what you are selling
he probably is just a scammer as his info is wrong