Not a chance.
At some point you will need to disclose your idea. I think you've fallen into the adult business, GFY paranoia that all of your ideas are brilliant and exclusive. Or that everyone will copy cat you and by tomorrow you'd have 500 sites ripping off your idea.
Which I always find laughable.
But even if you took it to a RL bank, or borrowed the money from an online broker... at SOME POINT you are going to have to provide a business plan, or model for this 'genius' before people will loan you a cent.
If you can't give the idea, or a business plan, your idea is nothing.
