This would all be fun and games, but I suspect the SEC will want an explanation and I'm not so sure Coinbase has a good one. I wouldn't be surprised if they are shutdown tomorrow before sunrise.
They are registered as money transmitters in just about every state, not sure what the legal implications of that are exactly, but I doubt the regulatory bodies will just let it slip. If there is any suspicion of "fraud", then you don't need SEC (or USDA, lol) - the local police department and FBI are generally good enough.