That sort of exists with minicabs here in the UK. Using Kabbee I say I want to go from my house to Heathrow on a certain date, and it comes back with prices for

That sort of exists with minicabs here in the UK. Using Kabbee I say I want to go from my house to Heathrow on a certain date, and it comes back with prices for ~15 cab firms. The firms aren't bidding in real-time, I'm guessing it's based on some £/mile or £/minute that they provide to Kabbee, but still.