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Design a cost-per-action bidding system for ads

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AppleML designLast asked Mar 2026

Advertisers pay for actions (installs, purchases), not clicks, and set a target cost per action. Design the system that bids in each ad auction to hit that target: predicting click and conversion rates, turning them into a bid, pacing the budget, calibration, delayed conversions, and how you evaluate it online.

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