You're probably going to get a cease and desist letter at some point if you haven't already talked with the various financial institutions and have contacts there... you're almost certainly violating their terms of service (and maybe people filing through you are too).
You might want to be proactive about reaching out and making some contacts with the financial institutions.
Or maybe not, maybe it's OK. Just uninformed intuition there.
Also, you probably want to add some pretty serious language in bold saying "You must be telling the truth, not telling the truth here can cause serious harm, etc."
You probably also want to do some basic confirmation of a person's identity so you don't get whacky results. Ask for a phone number maybe, and occasionally spot check calls? I could see this being used for pranking, harassment, or inappropriate use (disgruntled employee, uninformed spouse/boyfriend/girlfriend, etc).