Buying backlinks is the riskier of the two shortcuts, because Google's spam policy names "buying or selling links for ranking purposes" as link spam, while a moderate, in-content link exchange only becomes a problem when it is excessive. Paid links are fine if tagged rel="sponsored" or rel="nofollow", but then they pass no ranking credit. Exchanges cost nothing per link.
You need links soon. A seller offers a "DA 50 guest post" for a few hundred dollars, and a friend with a related site offers to link to you if you link to them. They feel like the same kind of risk, and they are not. This page compares them on what Google actually says and what each costs.
Disclosure: we make Backlinkster, a link exchange platform, so we have a stake in how this comparison reads. Both sides are covered below, including where buying makes sense and where an exchange does not.
The quick verdict
| Buying backlinks | Link exchange (done right) | |
|---|---|---|
| Typical cost | $112 median per paid link; $164 average per guest post (PressWhizz, July 2026) | A platform fee, or free |
| Google's stance | Link spam unless tagged sponsored or nofollow | "Excessive" exchanges are link spam; moderate, in-content ones are not named |
| Footprint risk | Higher: sellers and networks leave patterns | Lower when relevant and in-content |
| Link quality | Varies widely by seller | As relevant as your partner choices |
| Sustainability | Pay per link | No per-link cost |
What Google's policy says about each
Google's spam policies list both under link spam, with different wording. Buying and selling is flagged outright: "buying or selling links for ranking purposes," including exchanging money or goods for links. Paid links are acceptable only when qualified with rel="nofollow" or rel="sponsored". Exchanges are flagged when excessive: "link to me and I'll link to you" arrangements and partner pages built only for cross-linking are the examples given.
That difference in wording is the whole case. A purchase is a violation by definition unless tagged. A swap is a problem when it is a scheme.
Why buying links is the riskier of the two
When money goes one way and a link comes back the other, that is the transaction the policy names, and a tagged paid link carries no ranking credit by design. The cheap links usually come from sites that sell to everyone, so yours sits among links to unrelated offers, and footprints like that are what a spam system looks for. If a network is devalued, every link in it can go at once, including yours.
The price is the other problem. Ahrefs asked 450 sites across nine niches about buying a link inserted into an existing article and found only 12.6% were willing to sell, at an average of $361.44 (Ahrefs). The sites that said yes were disproportionately the ones that sell to anyone. Bought links, including paid niche edits in old posts, are also rented: stop paying and they often disappear.
Why a link exchange is lower-risk
A swap is barter, not a purchase, so no money changes hands per link and the paid-link pattern never exists. Each side publishes a unique, in-content piece on a relevant page, so the link reads like an editorial mention.
The reputation problem with exchanges comes from how they used to be done: sitewide footer swaps and public "link partner" pages. Avoid those, keep links in-content, relevant and few, and an exchange is two site owners referencing each other's work. More on exactly where Google draws the line.
Where each one fits
- Buying links: hard to recommend for most site owners. If you do buy, treat it as advertising: expect a sponsored or nofollow tag, price it as exposure, and read are sponsored links worth anything first.
- Link exchange: a solid, repeatable channel as one part of a broader profile, alongside directories, editorial mentions and content that earns links by itself. The keyword is moderation.
The pattern that keeps exchanges safe
It is not "exchange is bad". It is "footprint is bad". Relevant, in-content, unique and moderate in volume is safe. Irrelevant, sitewide, templated and high volume is a scheme, whether you bought it or swapped it.
On Backlinkster, whoever starts a swap publishes the partner's article first and the request goes out only after that. The submitted link must be an article URL on the member's own domain, and one published link cannot be reused for two live swaps. Each swap is verified by API.
When Backlinkster is not the right fit
If you want exposure on a specific large publication, a swap will not get you there, and a paid placement tagged sponsored may. If your site has no articles to publish yet, there is nothing to swap. And if you need a done-for-you service, an agency compared in top link building companies fits better. Free members get 5 swaps a month; the paid plans are Pro at $19 and Backlinkster at $49.
Frequently asked questions
Is it safe to buy backlinks? Not if they are untagged. Google lists buying or selling links for ranking purposes as link spam, and accepts paid links only when marked rel="sponsored" or rel="nofollow".
Is link exchange safe for SEO? In moderation, yes. Google names excessive link exchanges as spam, so keep swaps relevant, in-content and limited, and avoid sitewide footer links and partner pages.
How much does it cost to buy a backlink? PressWhizz's July 2026 analysis of 22,703 placements found a median paid link price of $112 and an average guest post of $164. Ahrefs' older outreach study found an average niche edit price of $361.44.
Do paid links help rankings? Tagged ones pass no ranking credit by design. They can still send readers and build brand awareness on a relevant site.
Which is cheaper, a link exchange or buying links? An exchange costs no per-link fee, only time and the content you publish for your partner. Buying costs money for every link.
Can Google tell if I swapped links? Google's policy describes the patterns it targets, such as reciprocal link pages built only for cross-linking. It does not publish how it detects them, so rely on relevance and moderation, not on avoiding detection.
Related: Are backlink exchanges safe? · Guest posting vs link exchange · How much does guest posting cost? · What are niche edits in SEO? · Is Fiverr Link Building Safe? · Upwork Link Building vs a Link Exchange