RTB Validator Spec Bid Request open RTB v2.5,Bid Request open RTB v2.4,Bid Request open RTB v2.3,Bid Request open RTB v2.2,Bid Request open RTB v2.1,Bid Request open RTB v2.0,Bid Response open RTB v2.5,Bid Response open RTB v2.4,Bid Response open RTB v2.3,Bid Response open RTB v2.2,Bid Response open RTB v2.1,Bid Response open RTB v2.0 JSON Validate