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How we reduced CPA by 31% using AI budget reallocation

When the model predicts conversion value per channel in real time, the bid auction gets a lot more forgiving

Andrii Nasadchuk · April 09, 2026 · 1 min read

Case notes from a 4-week engagement - what we changed, what we measured, what held up.

The brief

Agency had 6 channels, flat-spend allocation, poor attribution.

What we did

  • Pulled conversion-path data into a single pipeline.
  • Trained a small regression on channel × cohort × CPA.
  • Reallocated weekly based on marginal ROI predictions.

What happened

CPA dropped 31% over 4 weeks. Customer LTV held steady. Spend shifted away from display, toward search and partnerships.

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