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A hard maximum on the bid in any single auction. Bid caps give the most control and the least delivery, and are used by advertisers with a firm marginal value per result rather than a target average.

Cite this entry: Agency Echelon. "Bid Cap." Agency Echelon Reference, reviewed September 2026. https://agencyechelon.com/reference/glossary/bid-cap/

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Reviewed September 23, 2026. Reference text is licensed CC BY 4.0. Privacy