Novig's sign-up offer is: Deposit $10, Get $50 in Trade Credits, live in 48 states. Promonyx estimates it is worth $50, and it needs about $100 available at once.
Alabama, Alaska, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, Washington DC, West Virginia, Wisconsin, Wyoming.
This is an exchange, where people trade contracts on how events turn out with each other rather than against a book. The sign-up offer credits a trading bonus or trade credits once you deposit or trade the amount the offer asks for. Credits like these usually pay out only what they earn, not their own face amount, so they are worth less than the same amount in cash.