Reference / Glossary / Infrastructure and standards
Bid Request
The message a seller sends to buyers describing an available impression: site or app, placement, format, size, user signals where permitted, price floor, and deal IDs. Bid requests follow the OpenRTB specification and number in the tens of billions per day across the ecosystem.
Related terms
Cite this entry:
Agency Echelon. "Bid Request." Agency Echelon Reference, reviewed September 2026. https://agencyechelon.com/reference/glossary/bid-request/