How to Spot a Dodgy Link Building Agency

You get an email promising 50 high-DA backlinks for $300. A sales call with an agency that guarantees page-one rankings in 90 days. A referral to a "private network" seller who can only be reached via Telegram and insists on payment in crypto. The link building industry has always attracted its share of sharks, but after the March Spam Update, the waters are more dangerous than ever. A dodgy link building agency does not just waste your money. It can get your site penalized or algorithmically devalued, costing you months of lost revenue and forcing you through a painful recovery. I have spent ten years building and selling PBN links, and in that time I have seen every link building scam in the book. This guide will show you the red flags I use to spot a bad agency in five minutes flat, the questions to ask before you pay a cent, and how to find a provider who actually builds links that survive.

Why Dodgy Agencies Thrive

Google's continuous updates have made link building harder and more expensive. That creates a gap between what clients want—cheap, fast rankings—and what is actually possible with safe, white-hat or grey-hat tactics. Dodgy agencies fill that gap with false promises. They use inflated metrics, hidden networks, and aggressive sales tactics to close deals. They count on the fact that most buyers do not know what a clean link looks like. I have audited link profiles where 80% of the links were from deindexed domains with toxic anchors. The client had no idea because the agency's reports showed "high DA" and "premium placements." The agency disappeared after the March update hit. The client was left holding the bag. Do not be that client.

The 10 Red Flags of a Dodgy Link Building Agency

1. They Promise Guaranteed Rankings
No one can guarantee a #1 spot. Google's guidelines explicitly say that anyone promising guaranteed rankings is likely engaging in manipulative behavior. Even if an agency uses clean tactics, rankings depend on hundreds of factors outside their control: competitor moves, algorithm shifts, and your own site's content quality. An agency that guarantees results is either lying or using tactics so aggressive they will get you penalized later. I tell every prospective client: I can guarantee the quality of my links—their metrics, their indexation, their hosting—but I cannot guarantee where you will rank. Anyone who does is a snake oil salesman.

2. They Hide the Domain Names
A legitimate link building agency should be able to show you a sample of the domains they use. I share sample domains from our network at BuyPBNLinks with every serious inquiry, redacted enough to protect the domain but with enough data (TF, CF, traffic, niche, index status) for you to verify. A dodgy agency will refuse to share domains. They will say it is "proprietary" or that revealing domains would "put the network at risk." The real reason is that they do not want you to see the domain has a TF of 2, a spammy backlink profile, or is already deindexed. I once pushed a seller to reveal three sample domains. All three returned a blank site:domain.com search. They were deindexed. The seller was still selling links from them. That is the kind of agency you walk away from.

3. They Quote Only Domain Authority (DA)
Domain Authority from Moz is the most abused metric in the industry. It can be inflated with a few thousand spammy blog comments. I have seen domains with DA 40 and a Trust Flow of 4. That domain is toxic. A reputable agency should quote Trust Flow and Citation Flow from Majestic ($49/mo Lite) and explain the TF/CF ratio. I use a minimum TF of 10 and a ratio above 0.8 for my PBN domains, as I detail in my TF/CF ratio rule article. If an agency only talks about DA, or worse, their own proprietary "domain score," they are hiding low-quality metrics behind a number that looks impressive to beginners.

4. Their Prices Are Suspiciously Low
A real PBN domain costs $80-$250 to acquire, plus hosting and content. A single quality PBN link from a reputable seller typically costs $25 to $50. Niche edits on real sites with traffic cost $100 to $400. If an agency offers 50 links for $200, they are using domains that cost nothing—usually closeouts with spam histories—hosting them on a single shared server with no footprint protection, and filling them with AI-spun content. The money you save upfront will be spent ten times over on recovery.

5. They Allow Any Anchor Text You Want
A responsible link builder will push back if you ask for 20 links with the exact anchor "buy cheap car insurance." They know that an over-optimized anchor profile triggers SpamBrain. My anchor text data study from the March update showed that sites with exact-match anchors above 10% were heavily penalized. A dodgy agency will let you stuff keywords because they do not care about your long-term safety. They want to close the sale and make you feel like you are getting a powerful link. I covered the safe anchor ratios in my anchor text strategy guide. If an agency does not discuss anchor text diversity with you before you even pay them, they are not looking out for you.

6. They Have No Footprint Story
Ask a potential agency: "What do you do to randomize name servers and IPs across your network?" A legitimate PBN builder can talk for an hour about C‑class IP diversity, DNS randomization, clean SOA records, and how they audit for footprints. I wrote an entire guide on hiding PBN hosting footprints. A dodgy agency will have no answer. They might say "we use premium hosting" or "our network is fully private." If they cannot describe a specific technical footprint they avoid, they are not managing one. They are probably reselling links from a public blog network or a bulk hosting farm.

7. They Promise "Permanent" Links
Nothing in SEO is permanent. Domains expire. Sites get sold. Algorithms change. A legitimate agency offers a replacement guarantee, typically 30 days, and monitors links after that. A dodgy agency promises "permanent links" because it sounds good in a sales pitch, but there is no mechanism to enforce it. I have seen agencies delete their website and disappear within six months, leaving clients with dead links and no recourse. Ask what happens if a link is removed or deindexed after two months. A good agency will have a policy, even if it is not a full guarantee. A bad one will dodge the question.

8. They Sell "Bulk Link Packages" with Aggressive Turnarounds
An agency offers a "100-link package delivered in 5 days." Think about what that requires. One hundred placements in less than a week. The only way to achieve that is through automated link farms, mass blog comments, or a massive network of low-quality sites. Even if you had a network of 200 PBNs, a responsible builder would never place 100 links to a single money site in a week. The velocity alone would trigger a penalty. A legitimate agency will pace your links over weeks or months, not days.

9. Their Reporting Is Fluff
The monthly report you get should include the domain, URL of the linking page, anchor text, link attribute (dofollow/nofollow), a metric like TF/CF or DR, and ideally a screenshot of the placement. Dodgy agencies send reports that are missing key details. The domain name is replaced with "Premium Site #47." There is no way to verify the link exists. They might send a screenshot of a fake post on a localhost site. I have seen "links" that were just a PDF with a URL typed onto a screenshot. Always ask for a live sample report before you buy. If an agency will not share one, something is off.

10. They Cannot Explain How They Survived the March 2026 Update
The March Spam Update was the most significant link spam update in years. A legitimate agency should be able to tell you exactly how they prepared for it, what they changed in their network, and what the survival rate of their domains was. A dodgy agency will not even know the update happened. They will say "our network was unaffected" with no details. Press them. Ask what percentage of their domains stayed indexed. If they cannot answer, they either do not know or do not monitor—and both are disqualifying.

Legitimate Agency vs. Dodgy Agency: Quick Comparison Table

How to Vet an Agency Before You Pay

I use a simple five-minute vetting call for any new link provider. Ask these questions:

• "Can you send me three sample domains from your current inventory?" If they refuse, walk.
• "What is the average Trust Flow and TF/CF ratio of your domains?" They should have a number. If they quote DA instead, ask again.
• "How do you randomize hosting and DNS across your network?" They should mention C‑class IPs, name servers, and reverse DNS. If they look confused, walk.
• "What is your anchor text policy for a new client?" The right answer: "We start with branded and URL anchors and only introduce partial match once the profile has a safe foundation."
• "Do you have a replacement guarantee?" I offer 30 days. Some agencies offer longer. If they have no guarantee, assume the links are disposable.

I never pay for links without running at least one sample domain through Majestic, Ahrefs, and a Wayback Machine check.

What Happens When You Hire the Wrong Agency

I have picked up the pieces for enough clients to know the script. The client spends $1,500 on a "premium" link package. Rankings improve for two months. The client feels great. Then a core update hits. Half the links disappear because the domains were deindexed. The remaining links have aggressive exact-match anchors that trigger an algorithmic penalty. The client's traffic drops 50%. The agency is unreachable. The client then spends $3,000 on audits, disavows, and new links from a reputable provider to recover. The total cost is $4,500 and six months of lost revenue. The "cheap" agency was the most expensive decision the client ever made.

How BuyPBNLinks Does It Differently

I built my service to be the anti-dodgy agency. We send every client a sample report with real metrics—TF, CF, RD, traffic, and niche—before they pay. We explain our hosting setup: unique C‑class IPs, randomized name servers, clean reverse DNS. We default to branded anchors and advise on safe ratios. We pace links according to the safe velocity ranges I publish. And if a link drops or a domain deindexes within 30 days, we replace it. No questions asked. Our clients know exactly what they are buying because I spent ten years learning what happens when you do not.

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