Prebid & ad stack audit
Find out where your ad stack loses money.
A code-level audit of your Prebid setup, ad server and supply chain, done by the engineers who run Engerio.
- Median price
- €1,200
- Delivery
- 5 working days
- You get
- Report, fix list, walkthrough call
Audit scope
What we check
Typical findings in a publisher audit
- Critical
Prebid timeout of 3,000 ms on mobile delays every ad render
On mobile, 92% of winning bids arrive within 900 ms. Waiting longer adds latency, not revenue.
- High
- 4 of 11 bidders return bids for fewer than 1% of requests
They add auction latency, not revenue — removing them saves about 240 ms per auction.
- High
"Medium" price granularity caps bids above $20 CPM
Higher bids are rounded down, costing 2–4% of revenue on premium slots.
- Medium
Supply chain gaps in ads.txt and sellers.json
Buyers that verify the supply chain skip impressions they can't trace.
What we check
Prebid setup
- Prebid.js / Prebid Server versions & config
- Bidders, timeouts, latency
- In-app: Prebid Mobile / AdMob setup
Ad server & supply chain
- GAM line items & price granularity
- ads.txt & sellers.json
Compliance & performance
- Consent / TCF
- Core Web Vitals impact
- Analytics discrepancies
Why it's paid
No upsell into a wrapper
Free audits usually end in a revenue-share wrapper. Ours ends in a report.
No revenue share
We're paid for the work, not a cut of your yield.
Findings you own
The report is yours, whoever implements it.
Process
How it works
Intro call
30 min, free.
Access
Read-only access to config, ad server and analytics. NDA on request.
Review
5 working days to review the code and analyse the numbers.
Walkthrough
A call with the engineer who did it.
Proof
Engerio · Chapter 2
Our ad server
Campaigns compete inside Engerio, then its best bid competes with other bidders in the publisher's Prebid auction — in ~100 ms.
After the audit
Fix it yourselves
The report is written for your developers.
We implement and operate
Operations →
FAQ
Before you book
What does it cost?
Our median audit costs €1,200. The price depends on the size and complexity of your stack, and you get a quote before we start. No hourly surprises.
How long does it take?
5 working days from the moment we have access.
What access do you need?
Read-only access to your Prebid configuration, ad server and analytics is enough. We never change anything in production during an audit.
Do you sign an NDA?
Yes, on request, before we get any access.
Can you implement the fixes?
Yes. You can implement the fixes yourself using the report, or we can implement and operate them as a separate fixed-price engagement.
Do you audit bidder adapters?
Yes. For SSPs and bidders we review your Prebid.js adapter code and test coverage, bid request and response handling, and schain, consent and user-sync signals.
Book the audit
Tell us about your stack. One of our engineers will get back to you within 24 hours.