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Metrics type: Key Metrics • Category: Ad Platform

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At a glance

Sum of spend on Taboola placements (publisher sites or audience segments) that drove zero conversions in the window. The “obvious savings” number; this is money that produced clicks but no purchases. Native is patient by design (long conversion lag), so wait at least 14 days before acting on a zero-conversion item; native publishers often take 7, 14 days for the long-tail conversions to surface.

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Calculation

Calculated automatically from your Taboola 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 UK supplements brand. The 30-day window is 02 Apr 26 to 01 May 26. Total spend £15,000. What’s interesting:
  1. 9.6% wasted spend on Taboola is high; the typical native account runs 4, 8% wasted. This account has a publisher-targeting issue, the auto-bid is finding inventory the audience does not engage with on a purchase basis. Action: add the three named publishers to a block list.
  2. The tier-3 sports blogs (£380) are the most obvious cut. Health-and-wellness content does not convert on a sports-blog audience; this is straight audience mismatch. Block immediately.
  3. buzzfeed.com (£640) is more nuanced. BuzzFeed has a young, mobile-first audience that may match your product but converts on a longer lag than 18 days. Check at 30 days; if still zero, block. If 1, 2 conversions appear, keep but cap CPC lower.
  4. mirror.co.uk (£420) is similar to BuzzFeed; UK tabloid readership has the right demographic but a higher proportion of “casual scroll” intent. Move from CPC to smartBid CPA so the algorithm can self-correct, then re-evaluate at 30 days.
  5. Don’t kneejerk-block based on this card. The £1,440 looks recoverable but blocking too aggressively shrinks the auction inventory smartBid can use, often raising CPC on the remaining inventory. Net savings of a publisher block are typically 60, 80% of the headline wasted-spend figure; the rest leaks back as higher CPC elsewhere.
Quick sanity tests:
  • Wasted % rising over time = inventory degrading; auto-bid finding more low-quality publishers; check publisher allowlist.
  • Wasted % stable at 4, 8% = normal; native exploration cost.
  • Wasted % spiking on a single publisher = audience mismatch; block.
  • Wasted % falls but conversions also fall = you blocked too aggressively; relax the block list.
  • Zero wasted spend = you have probably allowlisted too tightly and missed scaling opportunities.

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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 Taboola Backstage: Backstage → Reports → Site Breakdown for the same window. Filter to publishers with zero conversions; the spend column should match this card to within sub-percent rounding. Backstage does not surface “wasted spend” as a single number; this card derives it. Why our number may legitimately differ from a manual Backstage cut: Cross-connector reconciliation:

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Known limitations / merchant FAQs

Should I block every zero-conversion publisher immediately? No. Native has a long conversion lag; some publishers genuinely take 14, 30 days for a click to convert. Wait until a publisher has 14+ days of clicks with zero conversions before blocking. Acting too aggressively shrinks the auction inventory smartBid can use, often raising CPC on the remaining inventory and netting a smaller savings than the headline figure suggests. What’s the “right” wasted-spend percentage? 4, 8% on a healthy native account. Below 4% usually means you’ve allowlisted too tightly and missed scaling opportunities. Above 8% means the audience targeting has issues; investigate publisher block lists, audience segments, and creative-publisher fit. Why is my wasted spend so high on a brand-new campaign? First 7, 14 days of any Taboola campaign are exploration. SmartBid runs a learning phase to find the publishers that convert; it spends across many sites before narrowing. Wasted spend in the first 14 days is investment, not waste. Only act after the campaign has had 50+ conversions and 14+ days; before that, the data is too thin to know which publishers are genuinely bad vs which are still being learned. The same publisher hits both Taboola and Outbrain wasted-spend, what does that mean? Genuine audience mismatch. If the publisher’s readers don’t convert on either native network, your product is not a fit for that publisher’s audience. Block on both networks; revisit in 6 months if you launch a new product line that might fit. My wasted spend dropped sharply but ROAS also dropped, what happened? You likely over-blocked. Aggressive publisher block lists shrink the auction inventory, smartBid is forced to bid up on the remaining inventory, CPC rises, and the marginal new conversions cost more than the wasted spend you saved. Net efficiency often falls when you over-block. Use a soft approach (CPC cap by publisher tier) rather than hard blocks for the borderline cases. Can I exclude specific URLs within a publisher (e.g. dailymail.co.uk/sport)? Limited support. Taboola’s URL-level blocking is improving but not as granular as Google Ads placement-level negatives. The reliable lever is publisher-domain blocking; sub-section blocking works on some publishers but not all. Why does Taboola not just auto-block zero-conversion publishers? Because zero-conversion in a 14-day window is often false. Native’s long conversion lag means a “wasted” publisher today can be a “converting” publisher in 7 more days. SmartBid does eventually de-prioritise low-converting placements, but it does so probabilistically rather than via hard blocks; the algorithm prefers to keep exploring. How does this card differ from Zero-Conversion Spend? This card is publisher-level (which publisher sites wasted spend); Zero-Conversion Spend is campaign-level (which campaigns are running with zero conversions overall). A campaign showing zero conversions in Zero-Conversion Spend is a bigger problem than a single bad publisher in this card.

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Tracked live in Vortex IQ Nerve Centre

Wasted Spend is one of hundreds of KPI pulses Vortex IQ tracks across Taboola 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.