There's lots of exchanges all trading the same things, with their own order-books etc - does anyone know if there's any "meta crypto exchange" out there, where (for example) I can place one order and the meta-exchange will fill it on my behalf using the best matches at *every* exchange it supports (which might be 2 or more at the same time) ?

Kinda like how the "dogpile" search engine from the 1990's used  to(maybe still does) search *all* the search engines for you at the same time, giving you the best results sorted in order on one page?