Conversion signal monitoring for ad agencies

When tracking breaks,
find out before your client does.

CookieChest watches CMP, GTM, Consent Mode and GA4 across every site in your portfolio. The moment one breaks, you get an email — not a panicked Monday call from your client.

Billed annually · 30-day money-back guarantee · Reassign slots any time

Signal status reportacme-agency.com · Today 09:00
Site availability200 OK — 1.2s response
Consent bannerLoaded, Consent Mode V2 active
GTM container14 tags firing correctly
GA4 streamEvents flowing post-consent
Pre-consent signalsGA4 fires before consent — needs review
Google Ads conversionsNo data received for 4h 12m

The pain you didn't see coming

Tracking failures don't announce themselves. They sit quietly in your client's GTM container until they become your problem.

The Monday morning email

Friday afternoon a developer pushes a release. By Monday your client emails: “leads have dropped — what’s happening?” You scramble to check tracking. Three days of conversion data are already gone.

Smart Bidding starves

Consent Mode misfires after a CMP update. Google Ads can’t see conversions. Smart Bidding starves the campaign — and even after you fix it, performance takes a fortnight to recover.

The retainer review

Six months on, the client’s MD pulls the spend report: “why did July come in 30% under target?” Without a timestamped audit trail you can’t show it was three days of CMP misfire fixed in hours. You eat the question — sometimes the contract.

One prevented failure pays for years of monitoring

A £10k/week campaign running blind for four days = £5,700 in untracked spend, two weeks of Smart Bidding recovery, and a client conversation you didn't need to have. At £71/slot/month, one prevented incident pays for the slot for six and a half years.

What you get when something breaks

Not a dashboard you have to remember to check. A specific email, with the receipts to show your client.

CookieChest Alerts
Today, 14:22
RED ALERT

GA4 conversions silent on client-site.com

What broke

Google Ads conversion tag has been silent since 10:18. No data received for 4 hours.

What changed

A site deploy at 10:14 introduced a CMP rule that's blocking the conversion script post-consent.

Impact if left

Smart Bidding is losing signal as we speak. Every day uncorrected adds 1–2 weeks to campaign recovery.

Last known good scan: 06:00 today. Full audit trail and scan history attached.

View full audit trail →

Simple per-slot pricing

One slot, one site. Client leaves mid-year? Reassign the slot to the new client — no extra cost, no leftover commitment.

Monitoring

Synthetic checks across your portfolio

£71/slot/month

£852/year per slot, billed annually

  • One slot, any site — reassign at any time
  • Site availability checks
  • CMP active verification
  • GTM container monitoring
  • Consent Mode V2 detection
  • Pre/post consent behaviour checks
  • Baseline change alerts
  • Email alerts with audit trail
  • Monitoring dashboard

30-day money-back guarantee

Pay up front. Not for you in the first 30 days? Email us — full refund on unused time, no questions.

Real-user monitoring (Intelligence) and other features are on the roadmap.

How it works

1

Buy your slots

Self-serve checkout for 1–4 slots. Five or more, book a quick call so we can size it right and apply volume pricing.

2

Verify the site

Add a one-line ownership tag via GTM. Confirms you have permission to monitor. Few minutes per site, done once.

3

We watch, you get alerted

Scans start within a business day. When something breaks, you get an email — with the audit trail to show the client.

Catch tracking failures before your client does

£71/slot/month. 30-day money back. Reassign slots whenever your roster changes.