All of the replies are not interested with what OP has to offer and I agree with them. There might be others that could be interested to try this depending on the price tag.
This kind of service is the same as paying a paid prediction in sports for us to put money on that isn't guarantee to hit most of the time. Promising a high hit rate is hard to maintain once you make a lot of predictions
VitKoyn (or others), what kind of proof would suffice to convince you?
I've written 5 predictions here in realtime, 5/5 were correct.
If I would write 30 predictions (in realtime, that you can verify prices match bitfinex) of which around 24 would be correct, would that suffice?
If I would manage a portfolio, with trades written in realtime in the forum, which generates at least 50% profit in 1 month, would that suffice?
This a good way of getting people interested with your service. I don't think this would convince us but it won't hurt in giving it a shot if you really want to offer a prediction service.