You bet against the market (binaryballs.com makes the counterpart as a market maker).
So, basically I bet against you, right? Could you be a little more transparent on how you calculate payoff? From what I see, you offer to make 1Gb bet against yours 0.8Gb. This seems to be pretty high house edge. Most bitcoin casinos offer like 0.5% house edge.
You can say that yes. It is not a casino. The payout rate varies function of the choosen market and the active contracts on that market. For example if there is a need to cover on a pair because there are a lot of "down" contract you may expect to see a 95% net return or even more on a "up" contract.
Could you display info about number of current contracts on your page for the sake of transparency? If there are many "down" contracts and no "up" contracts, I would expect something like 10x payout if I bet "up", not 95%. If there are equal amount of "down" and "up" contracts, the fair payout would be 2x, or 100%.