Nadex Binary Strike Price Ladder Width

I would like to know how the Price ladder contract point spreads for binaries are decided on. Indices specifically. US Tech 100 = 4 points, Wall St. 30 = 20 points, US 500 = 3 points and US SmallCap 2000 = 2 points. Please help.

Just a broad scope would be great.

Thanks, Jay

They do not fluctuate. They are designed by market and expiration time due to average volatility.

The exact specs can be found uisng the below links: http://www.nadex.com/stock-indices/contracts.html http://www.nadex.com/stock-indices/contracts.html

http://www.nadex.com/spot-forex/fx-contracts.html http://www.nadex.com/spot-forex/fx-contracts.html

http://www.nadex.com/trade-commodities/contracts.html http://www.nadex.com/trade-commodities/contracts.html"