Meta's Ad API to Remove Three Key Fields on October 27, Impacting Campaign Tools

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Meta will remove three fields—daily_outcomes_curve, budget_guardrail, and estimate_dau—from its Delivery Estimate API response on October 27, 2026. The change applies to all supported API versions, including unversioned calls, and version pinning will not defer this update. Ad tech tools that rely on these fields for forecasting, budget planning, and reach projections will receive null values without throwing errors. This could lead to tools silently displaying incorrect data like zero projected reach or missing budget warnings.

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