Hi AmCan,
I am sure the likes of BetDaq and WBX have APIs as well (Betting Exchanges).
I am not so sure about the sportsbooks, but I will ask around and see who might be offering this.
Since you are only listing exchanges below, I am cursious if you, yourself, have heard about any sportsbooks offering this?
And maybe any of the affiliate managers have some info they want to share about the sportsbook they represent?
Cheers,
Ras