ICBM Polska CSS — Comparison Shopping Service for Shopping campaigns
CSS (Comparison Shopping Service) is a Google partner program enabling product ads on Google Shopping through an accredited partner. The CSS auction mechanism can lower the effective cost per click in product campaigns — with no change to how the ads look to users. Campaigns are run by the ICBM Polska team — a Google Premier Partner since 2014, over 1,000 campaigns delivered.
What CSS is and how it works
CSS (Comparison Shopping Service) is a Google partner program in which accredited partners — such as ICBM Polska — can display product ads on Google Shopping on behalf of online stores. Unlike standard access through Google Shopping, the CSS auction mechanism works on different terms, which can result in a lower effective cost per click (CPC) while maintaining the same ad visibility for the end user.
The effect depends on the industry, competition level, and campaign configuration — which is why we do not quote a guaranteed savings percentage. Our experience shows, however, that e-commerce stores with mature product campaigns and a significant Shopping budget can see a real reduction in effective CPC after migrating to a CSS partner.
How the CSS auction mechanism works
In standard Google Shopping, the platform charges a fee for access to the auction inventory. CSS partners participate in the auction directly, without the default Google Shopping intermediary, which changes the auction cost structure. In practice, this means an advertiser using a CSS partner can get a lower effective CPC for the same auction positions. Ad visibility for the user — product name, photo, price, store name — remains identical to standard product ads.
- Lower effective CPC — the CSS auction mechanism can reduce the cost per click compared to default Google Shopping.
- No change to ad appearance — the user sees an identical product ad; the change concerns only the auction mechanism.
- Performance Max compatibility — the product component of PMax campaigns also benefits from the CSS effect.
- Existing campaigns keep running — after the feed migration, Shopping and PMax campaigns in Google Ads require no rebuild.
- Full budget control — the ad budget goes directly into the client's Google Ads account; ICBM Polska adds no markup on media.
Want to check how CSS could impact the CPC of your product campaigns? We'll prepare a free quote.
Request a free quoteWhich stores CSS is a good fit for
CSS works best for e-commerce stores running Shopping campaigns or Performance Max with a product feed in Google Merchant Center. The higher the spend on product campaigns, the greater the potential impact of the effective CPC on overall e-commerce campaign results. CSS makes the most sense when product campaigns are already well configured and optimized — a lower cost per click translates directly into ROI.
Feed migration and Merchant Center
Switching to a CSS partner requires a technical switchover of the product feed in Google Merchant Center — we handle it entirely. Existing Shopping and Performance Max campaigns in Google Ads can continue running without changes to structure, bids, or settings. We carry out the migration efficiently, minimizing any interruption to ad delivery. After the migration, we monitor comparative data (CPC, ROAS, revenue) in Google Ads and GA4 to assess the real effect of the change.
CSS and Performance Max campaigns
Performance Max campaigns that include a product (Shopping) component also benefit from the CSS mechanism. This means the effective CPC on product inventory in PMax can be lower after switching to a CSS partner — while keeping the full automation and reach of Performance Max. If you run both classic Shopping campaigns and PMax, migrating to CSS can deliver results on both fronts.
See how CSS could affect the results of your product campaigns on Google Shopping and Performance Max.
Let's talk about CSSWhat you gain with CSS through ICBM Polska
Lower effective CPC
The CSS auction mechanism can reduce the cost per click in product campaigns — with no change to ad visibility for the user.
Full PMax compatibility
Performance Max campaigns with a product component also benefit from the CSS effect — the CPC reduction works at the product auction level.
End-to-end feed migration
We take over the full technical migration of the product feed to CSS Merchant Center — efficiently, without interrupting campaigns.
Dedicated account manager
Every campaign is run by a dedicated specialist — a single point of contact who knows your feed, campaigns, and sales goals.
Google AI and Machine Learning
Shopping and Performance Max campaigns use Google machine learning — smart bidding, automatic product range segmentation, and ROAS optimization.
ICBM client panel
Access to the dedicated ICBM panel with campaign reports — not to an internal Google Ads account. Transparent data in one place.
How we work
Setting up a CSS + Shopping campaign
Why ICBM Polska
Data Driven
Using data allows us to increase the ROI and revenue of your marketing activities — and that translates directly into business growth.
Dedicated account manager
We have many years of experience growing companies through online advertising. Your dedicated account manager continuously oversees the delivery of your business goals.
Machine Learning / AI
Only with innovative Machine Learning / Google AI solutions (self-learning systems) can campaigns keep adapting to rapidly changing consumer behaviour.
Web analytics
Skill and talent, combined with the effective use of user data, let us consistently uncover opportunities for additional online revenue from new marketing initiatives.
Results that speak for themselves
Frequently asked questions
What is CSS (Comparison Shopping Service)?
How does the CSS auction mechanism work and why can it lower CPC?
Do CSS ads look different from standard Google Shopping ads?
Which stores is CSS a good fit for?
Does switching to CSS require changes to campaigns or the product feed?
Does CSS work with Performance Max campaigns?
Does the ad budget go directly to Google?
What does CSS campaign reporting look like?
Do I get access to the Google Ads account?
Who do I pay the Google Ads budget to?
I don't have a Google Ads account. Who creates the ad account?
What happens to the Google Ads account after we stop working together?
What does the Google Ads campaign management service include?
How long is the contract?
Which billing model do you prefer?
After what period can the campaign be evaluated?
How is campaign reporting handled?
Do you have a price list for your services?
