Backlinks 2026: What the Google API Leak Reveals About Link Evaluation

Google has been downplaying the importance of links for years. The data contradicts this narrative. In an international analysis of11.8 million Google search results, the top-ranked result hasthree times more referring domains than positions 2 to 10. At the same time, the 2024 Google API leak shows how differentiated Google actually evaluates links internally. This article contextualizes the leak findings and derives a leak-compliant link-building strategy for B2B companies in the DACH region.

Why backlinks remain decisive in 2026 despite Google's statements

Links remain an official ranking signal. Google itself confirms that ituses links as a signal for the relevance of pages and to discover new pages. The correlation data supports this: In addition to the top position's advantage in referring domains,site-wide link authority, measured by Ahrefs Domain Rating, correlates strongly with better rankings.

The distribution of links is extremely unequal. According to an Ahrefs analysis of approximately 14 billion pages,96.55 percent of all pages receive zero organic Google traffic, and there is aclear correlation between the number of referring domains and a page's traffic. Building a few high-quality backlinks sets you apart from the vast majority that has no relevant link base.

For Austria, market concentration intensifies the relevance. Google holds asearch engine market share of 81.87 percent in Austria, ahead of Bing with 9.01 percent(as of May 2026). With8.69 million internet users and 95.3 percent penetration, visibility in Austria means almost exclusively visibility in Google. Link authority that counts in Google thus counts almost entirely for the Austrian market.

What the Google API leak reveals about link evaluation

The leak exposed Google Search's internal architecture. It comprisesover 14,000 potential ranking featuresand according to iPullRank's analysis2,596 modules with 14,014 attributes. Three components are particularly revealing for backlinks.

• pageRank_NS (Nearest Seed):The leak namesseven different PageRank types, including the well-known ToolBarPageRank. One of them is a modified variant nowmarked as deprecated called pageRank_NS, assigned to Document Understanding. The logic behind it: Trust spreads from defined seed pages. The closer a domain is to these trusted sources, the more weight a link from it can carry.
• sourceType and index tiers:According to iPullRank, the sourceType attribute serves tocapture the quality of the source page of an anchor and correlates with the index tier of that source page. Google assigns documents to tiers, asSegIndexer is a system that places documents in tiers within the index. Anchors from higher index tiers carry more weight.
• Homepage PageRank as proxy:For new pages without their own link history, Google apparently uses an approximation. The attributehomepagePagerankNs represents the PageRank of a site's homepage and likely serves as a proxy for new pages until they have built their own PageRank.

Important for context: An attribute marked as deprecated is not necessarily out of operation, and correlation is not proof of the exact live algorithm. The strategic direction is nevertheless clear. Google thinks links in terms of trust proximity and source quality, not pure quantity.

Seed sites in practice and proximity as an Austrian B2B company

Which domains are closer to the seeds as trusted sources is not publicly defined by Google. From the functional logic, however, realistic candidates can be derived: established news and trade media, universities and research institutions, government agencies and official institutions, and large, long-trusted industry portals. For the DACH region, this means specifically building proximity to such domains.

• Trade media and industry portals:A specialist article or citable statement in an established industry medium brings a link from a higher index tier. Such sources typically lie closer to trusted sources than an arbitrary link directory.
• WKO and institutional directories:For Austrian companies, the Austrian Economic Chamber (WKO) with its company directory, industry associations, and guilds are obvious, credible sources with relevance to their own activities.
• Regional press:Local and regional newspapers link on genuine occasions such as site openings, funding, or studies. These links are clearly attributable thematically and geographically.
• Universities and research:Collaborations, guest lectures, or joint studies with universities and universities of applied sciences can generate references from the academic environment, which traditionally enjoys high trust.

The common denominator is merit rather than purchase. Proximity to seed sources arises through citable content, genuine occasions, and solid relationships, not through placing arbitrary links.

Link quality beats link quantity: the strategic consequence

The leak leads to a clear prioritization. A few links from tier-1 sources near the seeds weigh more than many links from low index tiers. This aligns with the industry's assessment, which allocates money accordingly. Theaverage accepted price for a high-quality backlink is 508.95 US dollars, and55.2 percent of surveyed professionals consider link building the most difficult SEO discipline. Quality is expensive and difficult, which is precisely why it is a competitive advantage.

Budget follows this logic as well. According to an industry survey,agencies spend an average of 32.1 percent and in-house teams 36.03 percent of their SEO budget on link building. Those who concentrate this budget on a few high-quality placements work more leak-compliant than those who spread it across many low-tier links.

On the topic of toxic links, pragmatism is worthwhile. Google only evaluatescrawlable a-elements with href attribute as a relevance signaland provides tools with rel attributes:sponsored or nofollow for paid links, ugc or nofollow for user-generated content, and nofollow when you don't trust the source. The disavow tool is usually only necessary for demonstrably manipulative patterns or a manual action. For normal cases: actively build good links rather than constantly chasing bad links.

Digital PR and earned media as realistic seed-proximate link sources

Digital PR is the most cited tactic in 2026. In an international survey of 518 SEO professionals,48.6 percent consider digital PR the most effective link-building tactic, far ahead of guest posts and creating linkable assets. The reason fits exactly with the leak: Digital PR targets editorial mentions in media, i.e., exactly those sources that are closer to trusted sources.

For the DACH region, digital PR means bringing your own data- or occasion-based stories to the right editorial teams. A small industry study with Austrian relevance, a comment on a regulatory change, or a regional business occasion are realistic hooks. Earned media differs from paid placements in that the link is editorially earned. Exactly this type of link carries the highest weight according to the leak logic.

Unlinked brand mentions and entity SEO

Brand and links are more closely connected than pure link counting suggests. In the industry survey,80.9 percent believe that unlinked brand mentions influence organic ranking. Even without a clickable link, a mention contributes to entity authority: Google connects the brand name with topics, locations, and people, thus solidifying the understanding of the brand as an entity.

In practice, two levers emerge. First, monitoring: systematically capture unlinked mentions of your own brand in media, forums, and industry portals. Second, conversion: politely ask the respective editorial team to add a link to the existing mention. This request is particularly promising because the content relevance already exists and only the technical reference is missing. This converts existing brand signals into linked, crawlable references.

Broken link building and linkable assets without manipulation

Two proven tactics are leak-compliant because they are based on genuine value.

• Broken link building:Here you search for links on thematically relevant, authoritative pages that lead nowhere and offer your own suitable content as a replacement. The operator benefits because a broken reference is repaired, and your own content receives a link from an established environment. The prerequisite is that the replacement actually fits better or at least equally well.
• Linkable assets:These are contents that others voluntarily link to, such as proprietary data analyses, industry benchmarks, calculators, templates, or comprehensive guides. Since Google onlyevaluates crawlable a-elements with href as a signalanddescriptive, concise, and relevant anchor text is recommended, assets should be designed to suggest natural, thematically clear linking.

Both tactics generate links through value rather than exchange. This is the crucial difference from manipulative patterns that Google addresses with rel attributes and, if necessary, with devaluation.

AI citation optimization: backlink authority in AI answers

Backlinks increasingly affect visibility in AI answers. In the industry survey,73.2 percent believe that backlinks influence the chance of appearing in AI search results like ChatGPT. Generative systems preferentially access sources that are considered authoritative and well-connected. Brand and link authority that counts in traditional search thus impacts the selection of cited sources.

Content optimization is added. According to the scientific GEO study,Generative Engine Optimization can increase visibility in generative answers by up to 40 percent. In practice, both levels combine: strong authority supported by seed-proximate sources increases the probability of being recognized as a source at all, and citable, clearly structured preparation increases the chance of actually being cited.

LinkedIn and XING in B2B link building

In the B2B environment of the DACH region, LinkedIn and XING are central reach channels. They typically provide nofollow links that do not pass direct PageRank signals, but they fulfill three other functions. First, distribution: content reaches decision-makers and can thus trigger the editorial or professional references that count. Second, brand signals: active company profiles and consistent personal profiles strengthen the brand as an entity. Third, relationship building for outreach that later leads to genuine links.

The HTTP Archive Web Almanac 2024 shows that nofollow is widespread: thenofollow attribute was present on 32.4 percent of desktop pages and 32.7 percent of mobile pages, while the more specific attributessponsored with 0.4 percent and ugc with 0.4 percentare rarely used. Social links are therefore not a replacement for editorial backlinks, but the amplifier that makes them possible in the first place.

Legal framework for link-building outreach

Two sets of rules apply to outreach. Whether you may email an editorial team or a website operator at all is governed by marketing law. The GDPR only governs how you handle their contact data.

In Austria, email for direct marketing purposes is prohibited without the recipient's prior consent under Section 174(3) TKG 2021, even to a business address and even as a single email. In Germany, Section 7(2) No. 2 UWG requires prior express consent for advertising by email, again with no exception for businesses. Austrian courts interpret direct marketing broadly: merely suggesting that someone use certain services is enough. A link request that promotes your own content can therefore fall under these rules. A contact address published online does not count as consent, and legitimate interest under the GDPR does not replace consent. The existing-customer exceptions (Section 174(4) TKG 2021, Section 7(3) UWG) rarely help with link outreach, because they require an address obtained from your own sale to the recipient.

Four principles follow from this.

• First contact without email: Approach editorial teams and operators by letter. A LinkedIn message is possible but should be a personal topic pitch, not an advertisement, because promotional direct messages can also count as electronic mail. In Germany, a phone call to a business is also permitted if its presumed consent can be assumed (Section 7(2) No. 1 UWG). In Austria, marketing calls also require prior consent under Section 174(1) TKG 2021.
• Email only after consent: Only send an email once the other party has agreed, and record when and how they did.
• Relevance and transparency: Only contact persons or entities with genuine professional relevance to your request. Clearly state sender and occasion and offer a simple way to object.
• Data minimization: Only collect and store what is necessary for contact and delete data when the purpose ceases.

Common mistakes in link building after the leak

• Focusing on quantity instead of tier proximity: Many low-tier links bring little when weight comes from proximity to trusted sources. A few strong placements beat mass.
• Overvaluing toxic links: Permanent disavowing of harmless links ties up resources. Google provides rel attributes, and the disavow tool is usually only necessary for manipulative patterns or manual action.
• Ignoring unlinked mentions: Those who don't track brand mentions waste easy links. 80.9 percent see them as a ranking signal that can often be converted into a link with a simple request.
• Confusing social links with ranking links: LinkedIn and XING links are typically nofollow and thus amplifiers, not PageRank replacements. They do not replace editorial backlinks.
• Purchased links without labeling: Paid placements without sponsored or nofollow attributes violate Google's guidelines and risk devaluation.
• Email outreach without consent: A link request by email can count as direct marketing and then requires prior consent in Austria (Section 174 TKG 2021) and Germany (Section 7 UWG), even as a single email to a business address. Mass, impersonal requests also lower response rates.

Metrics: Which KPIs really count after the leak

After the leak, the focus shifts from pure link count to quality and proximity. These metrics are relevant.

• Referring domains:The number of different linking domains is more meaningful than the total number of links. It correlates with traffic and rankings, as thecorrelation between referring domains and trafficshows.
• Domain authority (DR/Authority):An authority value at site level such as Ahrefs Domain Rating serves as an approximation of link strength and correlatesstrongly with better rankings. Important is the evaluation of linking domains, not just your own.
• Tier proximity and source quality:Since sourceTypecorrelates with the index tier of the source page, qualitative assessment of whether a link comes from an established, trusted environment is worthwhile. A link from a trade medium is weighted differently than one from an arbitrary directory.
• Anchor profile:A natural mix of brand, URL, and thematically relevant anchors is healthy. Sincegood anchor text should be descriptive and relevant, an over-optimized, exactly matching anchor profile should be avoided.
• Brand mentions and unlinked mentions:Capture linked and unlinked brand mentions as an indicator of entity authority and as a pipeline for future links.

Tracking is done via backlink tools (referring domains, DR, anchor distribution), brand monitoring for mentions, and Google Search Console for actual impact on impressions and clicks. The key is to observe changes over time rather than individual snapshot values.

Further reading

The API leak confirms what a quality-oriented link strategy suggests anyway: Google thinks links in terms of trust proximity and source quality, not quantity. For B2B companies in the DACH region, this means concentrating budget and energy on a few seed-proximate sources, using digital PR and earned media as the core, consistently converting brand mentions into links, and conducting outreach without unlawful marketing emails. Sensible next steps are a backlink audit by tier proximity rather than pure count, building a citable linkable asset with Austrian data relevance, and integrating link authority with GEO visibility in AI answers.