Find wasted Google Ads spend using an AI client
Wasted spend in Google Ads is not one thing. It is zombie keywords that never converted, search terms that are off-topic, placements in Display campaigns serving on content farms, and bid strategies optimizing toward proxy metrics that do not correlate with revenue. An AI client can scan all of these in one session.
The four categories of wasted spend
Zombie keywords — Keywords that have accumulated spend over 60+ days with zero conversions. They are not obviously bad (they may be getting clicks, even decent CTR), but they are not producing outcomes and the algorithm is not learning from them. In most accounts, 15–25% of active keywords fall here.
Off-topic search terms — Search queries triggering your ads that share words with your keywords but have no commercial relationship to your product. A plumber bidding on "drain cleaner" gets triggered by "DIY drain cleaner chemicals." Filtering the search term report surfaces these.
Underperforming audiences — Demographic or audience segments that convert at 3x your average CPA. Smart Bidding adjusts bids automatically but does not exclude segments; manual exclusions can reallocate that budget to better-converting audiences.
Display network content farms — Display and YouTube campaigns serving on low-quality placements. Irrelevant traffic, low engagement, near-zero conversion. Placement exclusion lists solve this but require reviewing the placement report.
Zombie keyword audit with SpendSignoff
Ask your AI client: "List all active keywords in my Google Ads account with more than 100 clicks and zero conversions in the last 90 days, sorted by spend descending." This calls query_entities with a filter on the keyword performance report.
The response shows each zombie keyword, its campaign and ad group context, total spend, and click volume. Sort by spend and you immediately see where the money went. Ask a follow-up: "Propose pausing the top 15 by spend." SpendSignoff stages pause proposals for each one, queued for your review.
Do not pause branded terms without checking
Search term analysis
The search term report reveals what queries are actually triggering your keywords. Ask: "Show me the top 20 search terms by spend that do not contain any of my active keywords." These are queries triggering through broad match or BMM expansions that you have not explicitly targeted.
Follow up: "Which of these have zero conversions and more than 20 clicks?" Candidates for negative keywords. Ask SpendSignoff to draft negative keyword additions: "Add these 8 queries as exact-match negatives at the campaign level for my Search campaigns." One draft, covering all eight.
Audience exclusions
Ask: "Show me conversion rate and CPA by demographic segment — age, gender, device — for the last 30 days." Compare each segment's CPA to your account average. Segments at 3x or more average CPA are strong exclusion candidates, particularly if they represent a meaningful share of spend.
The AI can draft demographic exclusions as campaign-level or ad-group-level bid modifiers. Full exclusions are also possible for segments that convert near zero.
What the typical cleanup reveals
In a moderately managed account (quarterly human reviews, no dedicated PPC resource), a systematic waste audit typically surfaces 18–28% of spend in keywords and placements that should be paused or excluded. Not all of it is recoverable — some waste is the cost of testing. But the clearly mechanical waste (zero conversions, 90+ days, significant spend) is straightforward to cut and redeploy.
The bigger value is not the one-time cleanup but the ongoing monitoring. SpendSignoff's autonomy loop can run weekly zombie-keyword checks and queue new proposals as they cross the threshold you define.
FAQ
- How do I set up recurring zombie keyword monitoring?
- In the SpendSignoff autonomy loop configuration, define a rule: flag keywords with spend over $X and zero conversions in the last 30 days. The loop runs on its daily cycle and queues pause proposals whenever new keywords cross that threshold.
- Can this analysis run on Meta campaigns too?
- Yes. The equivalent for Meta is audience fatigue analysis — ad sets with declining CTR and rising CPM over a rolling 14-day window — and placement performance by audience network vs. Facebook feed vs. Instagram. SpendSignoff reads both platforms and can run the combined waste analysis in one prompt.
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