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Server-side tracking reduces CPA by sending more complete and accurate conversion data to ad platforms, enabling their bidding algorithms to optimize more effectively. When platforms receive enriched data—hashed emails, phone numbers, and accurate attribution—they identify high-value audiences more precisely. Soda Sense cut their Google Ads CPA by 50% after implementing server-side enhanced conversions, with a corresponding 35% ROAS improvement. Typical CPA reductions range from 10-25%, with the largest gains seen in businesses that had significant tracking gaps before implementation.