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 — and the catch

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.

What 99% uptime looks like

A dev pushes an untested update. GTM stops firing. We catch it inside 6 hours — not the next retainer review. One incident like that pays the slot for years.

WHAT WE'VE FOUND
69%

of UK sites had GA4 silent after consent on first scan

We scan UK sites across multiple sectors and consent platforms — all running paid advertising. The majority had GA4 failing to fire when the visitor accepted cookies. Most of the agency reporting they pay for, quietly broken on the day we found it.

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

The alert finds you — no dashboard babysitting required. 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 we found

GA4 conversion tag stopped firing after consent on client-site.com.

When

Working at our 06:00 scan. Silent at our 14:00 scan. Something changed in that window — worth checking deploys, CMP edits, or tag manager changes.

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.