Price comparison

Skąpiec feed for Shopify

Skąpiec.pl is Poland's veteran price comparison site, run by Ringier Axel Springer Polska and configured entirely in the self-service Onet Ads panel. Its robot crawls a hosted feed URL, the exact model Feedflock serves: your Shopify catalog rendered in the published XML vocabulary, on a stable, unguessable URL, refreshed every hour.

Install on Shopify

01 · ShopifyProduct in the catalog

Linen shirt SandNordlin · Men's shirtsSKU-2048 · S–XL

Price

219 zł

In stock

0 pcs

When out of stock

02 · skapiec.xmlUpdated just now

<item>

<catpath>Odzież / Koszule męskie</catpath>

<photo>https://cdn.shop.example/img/linen-shirt-sand.jpg</photo>

<photo>https://cdn.shop.example/img/linen-shirt-sand-back.jpg</photo>

<url>https://shop.example/products/linen-shirt-sand?variant=9087654322</url>

<vendor>Nordlin</vendor>

</item>

Setup

Live in five steps

From a bare Shopify store to a listed offer: the whole setup fits into one coffee break.

Register in the Onet Ads panel
Skąpiec is bought and configured in Ringier Axel Springer's Onet Ads panel (panel.onetads.pl). Log in with an O!Konto, register your company (NIP and address; verification usually takes up to 2 working days), then add the Skąpiec.pl service.
Install Feedflock
Add Feedflock from the Shopify App Store. It reads your products, variants, stock and images directly through the Shopify API.
Pick the Skąpiec template
Create a new feed from the Skąpiec template. compid, catpath, photo, url, vendor, name and price are mapped from the start, with one item per variant and the name built from the product and variant titles.
Fill the matching keys
Every offer needs at least one of partnr (manufacturer code) or EAN. The template fills them from the variant SKU and barcode. Make sure each product also has a category path: exactly one per product is an integration condition.
Paste the feed URL into the panel
Register the hosted feed URL under Ustawienia witryny → Feed produktowy. RASP's robot crawls it to add new offers and update prices. Skąpiec itself recommends an unguessable URL over a password, which is exactly what Feedflock hosts.
https://feedflock.appfleece.com/f/demo-skapiec/skapiec.xml

Feed health

Catch feed issues before Skąpiec does.

Before every generation Feedflock checks that every field the channel requires is filled, and, on templates verified against the channel's own spec, that the values fit its rules. Most problems are fixed with one click, without editing products in Shopify.

Feed quality · skapiec.xml

76 / 100

To review: 4

Neither partnr nor EAN on 8 offersThe spec requires at least one of the two matching keys per offer. These variants have an empty SKU and no barcode in Shopify.

Empty category path on 9 productscatpath fills from the product type, which these products lack. Every product must belong to exactly one category.

No vendor on 7 productsThe Shopify vendor field is empty. Skąpiec groups competing offers by vendor and name, so a missing brand hurts matching.

Variants sharing one URL (5 products)The variant deep link is switched off. Skąpiec requires every product to have its own page address: one item per variant needs one URL per variant.

The feed

What the channel receives

skapiec.xml

<item>
  <compid>9087654322</compid>
  <catpath>Odzież / Koszule męskie</catpath>
  <photo>https://cdn.shop.example/img/linen-shirt-sand.jpg</photo>
  <photo>https://cdn.shop.example/img/linen-shirt-sand-back.jpg</photo>
  <url>https://shop.example/products/linen-shirt-sand?variant=9087654322</url>
  <vendor>Nordlin</vendor>
  <name><![CDATA[Linen shirt Sand M]]></name>
  <price>219.00</price>
  <partnr>SKU-2048</partnr>
  <desclong><![CDATA[A breathable linen shirt in a regular cut.]]></desclong>
  <ean>5901234123457</ean>
</item>

Live preview

Nordlin

Linen shirt Sand

219 zł

Feed fields

compid

9087654322

catpath

Odzież / Koszule męskie

photo

https://cdn.shop.example/img/linen-shirt-sand.jpg

photo

https://cdn.shop.example/img/linen-shirt-sand-back.jpg

url

https://shop.example/products/linen-shirt-sand?variant=9087654322

vendor

Nordlin

name

Linen shirt Sand M

price

219.00

partnr

SKU-2048

desclong

A breathable linen shirt in a regular cut.

ean

5901234123457

The channel

Poland's veteran comparison site

Skąpiec.pl has compared prices since 2004 and belongs to Ringier Axel Springer Polska. Your offers sit next to the whole market on a product card, compared on price.

Self-service from start to finish

No contracts and no account manager: an O!Konto, company verification in about two working days, add the Skąpiec service and paste the feed URL. One panel also runs Lamoda.pl, Opineo.pl and the rest of RASP's commerce services.

Costs you can cap

Billing is per click at a per-category CPC rate, with a monthly redirect limit. Reaching the limit simply stops your offers being shown, so the spend can never run away; the current limit is self-service.

The feed

A template written against the operator's own published specification: the <xmldata> / <version>13.0</version> / <data> frame and exactly its element names, with name and description in CDATA the way the sample shows
One item per variant, each with the Shopify variant ID as a stable compid (max 200 characters, per the spec) and a URL that deep-links to that variant
The name defaults to product title + variant title, because the vocabulary has no attribute element: colour and size can only live in the name
The matching keys come filled from the start: partnr from the variant SKU and EAN from the barcode, at least one per offer, as the spec's footnote demands
The price goes out gross, as a bare number with a dot decimal and no currency element, matching what your shop page shows
The readiness check lists offers missing a required element or both matching keys before you hand the URL to the panel
availability stays out of the feed on purpose. The spec's sample shows 24 but never defines the element, so we emit nothing rather than something wrong

Deep dive

A hosted URL the robot crawls

Skąpiec reads one XML file from a fixed URL and asks that the address never changes
Password protection is discouraged: a long unguessable URL is the recommended shape
Do not restrict access by IP: the crawler's addresses change (AS12990, five documented User-Agents)
Images are fetched too, by a separate worker

Technical details

Skąpiec's technical requirements describe exactly the model Feedflock serves: one XML file at a permanent URL, fetched by the service's robot to add new offers and update prices. Password protection is explicitly discouraged in favour of a hard-to-guess address, which is what a Feedflock feed URL already is.

Two hosting rules follow. Do not limit access to specific IP addresses, because the crawler's addresses change; and do not block its agents, five of which RASP documents by name, including one that literally says Skapiec. Images are fetched separately by an image worker, so your CDN links must be reachable too.

A small vocabulary, exactly as published

The frame is <xmldata> with <version>13.0</version> and one <item> per offer inside <data>
Eleven elements in total: compid, catpath, photo, url, vendor, name, price, partnr, desclong, availability, ean
photo is the only repeatable element: the gallery renders as sibling <photo> children
No attribute element exists: colour and size have nowhere to go except the name

Technical details

The specification RASP publishes is short and complete: eleven elements inside an <xmldata> frame stamped <version>13.0</version>. The name and the long description are CDATA in the sample; everything else is plain escaped text. compid is the unique offer identifier, 200 characters at most, the only length the document states.

There is no attribute or parameter element at all, so colour, size and material can only ride inside the name. That is why the template's default name is the product title plus the variant title: with one item per variant, the name is the only place that can tell them apart.

Pairing: one of two keys must be there

partnr (manufacturer code) and ean carry the footnote: at least one must be filled
vendor and name do the rest of the matching work
catpath is your shop's own category path, levels separated by "/". Skąpiec publishes no tree
Every product must belong to exactly one category

Technical details

The spec's only hard pairing rule sits in a footnote on two elements: every offer must carry at least one of partnr, the manufacturer's product code, or an EAN. The template maps both from the start (the SKU and the barcode), so a fully maintained Shopify catalog satisfies it without extra work.

The category is your shop's own hierarchy with levels separated by slashes; Skąpiec publishes no category tree for feeds and sends no ids. By default the path comes from your product type, and the integration conditions require exactly one category per product.

What the feed does not carry

No delivery data of any kind: no carrier, no shipping price, not even a weight
No promotional price element, no stock count, no colour or size fields
availability appears in the spec's sample (24) but its own tag list never defines it
The free-shipping badge is driven by phrases in the offer name, set up in the panel

Technical details

Skąpiec's vocabulary has no delivery element at all: no carrier list, no shipping price, no cash on delivery, not even a weight to estimate from. The one cosmetic exception is the Darmowa wysyłka badge, granted to offers whose name contains a phrase like "Dostawa 0 zł" when the badge's scope is set to the XML file in the panel.

The strangest gap is availability: the sample file carries <availability>24</availability>, yet it is the one element the tag definitions skip: no values, no unit, no stated meaning. Rather than guess, the template ships it unmapped; your Onet Ads contact (bok@skapiec.pl) can confirm the accepted values before you fill it.

The takeaway

One URL the robot already knows how to crawl, an XML file that follows the published spec element for element, and matching keys filled from the start. Your Shopify catalog stays the single source of truth, and Skąpiec always reads a feed that mirrors it.

Claude · ChatGPT

Or set up your Skąpiec feed in chat

Connect Feedflock to Claude or ChatGPT and ask. It creates the feed as a draft, maps your categories to Skąpiec's own tree and tells you what is still missing. You approve every change.

How it works →

feedflock · mcp

Create a Skąpiec feed for my store and map my categories.

I'll create it as a draft and show you each change before I make it.

FAQ

Through the Onet Ads self-service panel (panel.onetads.pl). Even skapiec.pl's own "Informacje dla sklepów" page redirects there. Log in with an O!Konto, register your company with its NIP, wait for verification (usually up to 2 working days), add the Skąpiec.pl service and paste your feed URL under Ustawienia witryny → Feed produktowy.

RASP states only that it synchronises regularly and that fetching can also happen during the day. No interval is published. Feedflock regenerates the file every hour on the same URL, so whenever the robot comes, it reads prices and stock at most an hour old.

Per click, at a CPC rate set per category in the price list, with a monthly redirect limit. Reaching the limit stops your offers being shown until the next month. You can raise the current limit yourself in the panel, while the base limit is a contract change by e-mail to bok@skapiec.pl.

No tree to map to: Skąpiec takes your shop's own category path in catpath, levels separated by "/". The template fills it from your product type by default; if your hierarchy lives in a metafield, map that instead. The one rule is exactly one category per product.

The spec's sample file carries <availability>24</availability>, but its own tag list never defines the element: no vocabulary, no unit, no meaning for a missing value. The template therefore ships it unmapped. If you want it filled, confirm the accepted values with Skąpiec (bok@skapiec.pl) and map a static value.

Neither exists as an element. There is no delivery data and no promotional price in the vocabulary. The Darmowa wysyłka badge is the exception that proves the rule: it is granted by a phrase inside the offer name (for example "Dostawa 0 zł"), combined with the badge setting in the panel, not by any dedicated tag.