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Metrics type: Key Metrics • Category: Ad Platform

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At a glance

Spend on MediaMath placements (publisher domains, app bundles, audience segments) that drove zero attributed conversions in the window. MediaMath caveat (May 26): post-restructure pixel instability can artificially classify good placements as “wasted” when the issue is platform-side. Cross-check pixel health before acting on this card on MediaMath specifically.

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Calculation

Calculated automatically from your MediaMath data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.

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Worked example

The same enterprise homeware brand. Window 02 Apr 26 to 01 May 26. Total spend $72,200. What’s interesting:
  1. 3.7% wasted spend is healthy band for an enterprise DSP account. No structural issue but the named placements are still actionable.
  2. MediaMath-specific check before acting: confirm pixel health is OK on each “wasted” placement. Open T1 → Pixels → diagnostics, ensure conversion events fired correctly during the 30-day window. If pixel was unstable, some “wasted” placements may be false positives, no action needed beyond pixel-stability resolution.
  3. The weather widget app ($820) is a click-fraud suspect on a 0.007% effective CTR. Block the bundle. Standard DSP issue, not MediaMath-specific.
  4. buzzfeed.com display ($1,200) is borderline; 820 clicks no conversion suggests audience scroll-mode or display creative not native-fit. Test creative change before blocking.
  5. Regional sports streaming audio ($640) at 21+ days = block. Audience mismatch.
  6. Total potential savings $2,660 but expect net 60, 80% of that after Brain reallocates.
Quick sanity tests:
  • Wasted % rising over time = inventory degrading OR pixel issues. Differentiate by checking pixel diagnostics first on this connector.
  • Wasted % stable at 3, 7% = normal exploration cost.
  • Wasted % spiking on a single placement = audience mismatch or click-fraud; investigate.
  • Account-wide “wasted” suddenly with no inventory change = pixel outage on MediaMath; check T1 status.
  • Zero wasted spend = over-allowlisted, missed scaling.

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Sibling cards merchants should reference together

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Reconciling against the vendor’s own dashboard

Where to look in MediaMath T1: T1 → Reports → Site/App Breakdown for the same window. Filter to placements with zero conversions. T1 does not surface “wasted spend” as a single number; this card derives it. Why our number may legitimately differ: Cross-connector reconciliation:

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Known limitations / merchant FAQs

My MediaMath wasted spend doubled overnight, what happened? Pixel health first, on this connector. A doubling overnight is highly unlikely from a real change in placement quality; far more likely the conversion pixel had an outage, classifying converting placements as zero-conv. Open T1 → Pixels → diagnostics for the affected window. If pixel was healthy, then proceed to standard checks. Should I block every zero-conversion placement on MediaMath? No. Same DSP rule as elsewhere (wait 14+ days), plus the MediaMath-specific rule: confirm pixel was healthy during the zero-conv window. Blocking placements that were falsely classified doesn’t recover budget; it just shrinks future reach. What’s healthy wasted-spend % on MediaMath? 3, 7% on stable pixel weeks; up to 10, 12% during pixel-instability events (which then resolve themselves once the platform recovers). If wasted % is consistently above 10% across multiple stable months, the underlying inventory or audience targeting needs work. Why is in-app display so often in the wasted list? Same as on every DSP, mobile in-app inventory has higher click-fraud rates and weaker audience targeting metadata. Maintain a curated bundle allowlist; avoid open-bundle exchange purchasing on in-app. My CTV PMP shows wasted spend, what’s wrong? Check view-through window first. PMP CTV with 1-day view-through almost always shows wasted spend; CTV converts on 3, 7 day delay. Set CTV view-through to 7 days and most CTV “waste” disappears. My wasted spend dropped sharply after a pixel fix, was that real waste? No. The “wasted” before was mostly false-positive (good placements with broken pixel attribution). The drop reflects pixel recovery, not actual placement quality change. How does this card differ from Zero-Conversion Spend? Same as on every DSP: this card is placement-level (publishers/bundles/segments); Zero-Conversion Spend is campaign-level (whole campaigns). Read both for full picture. What’s the MediaMath-specific blocking strategy? Be conservative on this connector. False positives are more common; block-list mistakes shrink reach and the platform’s reach is already compressed post-restructure. Use bundle-level CPM caps for borderline cases; reserve hard blocks for clear click-fraud or audience-mismatch placements. Should I migrate the block list when migrating to TTD? Yes, with translation. Most bundle/domain blocks translate directly (same SSP inventory). Audience-segment blocks may not translate (different segment taxonomies). Audit during migration.

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Tracked live in Vortex IQ Nerve Centre

Wasted Spend is one of hundreds of KPI pulses Vortex IQ tracks across MediaMath and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English. Start for free or book a demo to see this metric running on your own data.