Nadex – www.nadex.com

Minimum deposit: $250
Nadex is available only through an online trading platform and allows you to trade for $1 per contract. This type of trading is legal and regulated by the Commodity Futures Trading Commission, but it is a high-risk trading method and recommended only for experienced, expert traders. Nadex is an exchange that allows trading in binary options, touch brackets, and call spreads. Unlike most platforms you will find, this one not a broker that gives you access to another market or exchange. Nadex matches you with another party in the transaction and never holds any securities itself.

http://www.nadex.com/