An ABC link exchange is a three-way link swap built so that two sites never link directly to each other. Site A gives a link to site B, and in return site C gives a link to site A. Site A ends up with a link, the other party ends up with a link, and nothing on the surface looks like "you link to me, I link to you."

A typical example: a dental practice blog (A) agrees to publish a link to a marketing agency's client site (B). In return, the agency places a link to the dental blog on a health site it runs (C). The agency controls both B and C, so for the agency the "three-way" deal is really a two-way trade with one extra hop in the middle.

The name comes from the three sites in the chain. Variations stretch the chain to four or more sites (A to B, B to C, C to D, D to A), but the logic is the same: an exchange of links arranged so the reciprocity is harder to see.

An ABC link exchange works by splitting one trade across two sites controlled by the same party. The person offering the deal almost always owns or manages more than one website, so they can receive a link on one property and give a link from another.

The steps usually run like this:

  1. Two parties agree on a swap, often through outreach emails, link building groups or a marketplace.
  2. Party 1 links from its site (A) to a site chosen by party 2 (B).
  3. Party 2 links from a different site it controls (C) back to site A.
  4. The links are often published weeks apart, on unrelated pages, to make the pattern harder to connect.

Guides that recommend the tactic present it as a safer form of reciprocal linking. Respona, for example, describes ABC exchanges as "generally considered safer than direct reciprocal links" while also saying they still fall under Google's link schemes [2]. That second half is the part that matters.

Yes. An ABC link exchange done to improve rankings is a link scheme under Google's spam policies, because Google defines link spam by its purpose, not by its shape. Google's policy calls link spam "the practice of creating links to or from a site primarily for the purpose of manipulating search rankings," and lists "excessive link exchanges ('Link to me and I'll link to you')" as an example [1].

Nothing in that wording says the exchange has to be direct. A three-way exchange is still "link to me and I'll link to you," with a second website standing in for "I." The extra hop changes how the trade looks in a link graph. It does not change what the trade is.

The same policy lists "exchanging goods or services for links" as link spam [1]. A link given in return for a link is an exchange of value for a link, whichever site the return link comes from.

An ABC link exchange is not reliably safer than a direct reciprocal link, and it often carries more risk. The claim that three-way swaps are "undetectable" is widely repeated and has no published evidence behind it. Google has never said how it detects link exchanges, and no outside study has measured how often three-way swaps are caught.

There are concrete reasons the three-way version can be worse:

  • Direct reciprocal links are normal. Ahrefs found in 2019 that 73.6% of 140,592 domains with meaningful traffic had at least some reciprocal links [3]. Two sites in the same industry linking to each other happens naturally. A three-way chain between unrelated sites does not.
  • The C site is the weak point. The site that sends the return link is usually part of a portfolio the other party uses for many trades. If that portfolio is a network built to sell or swap links, every site that took a link from it shares its footprint. Search Insider does not support or suggest the use of private blog networks.
  • You give up control. Site A publishes a real link from its own domain, on a site it cares about, in exchange for a link from a site it does not control and often has not vetted.

Search Insider's view: the question to ask about any exchange is not "can Google see the loop?" but "would this link exist if the trade had not happened?" If the answer is no, the link is the kind Google's policy describes, whatever the number of sites in between.

A reciprocal link exchange is a direct swap where A links to B and B links back to A, while an ABC link exchange routes the return link through a third site so the swap is indirect. Both are link exchanges. Both fall under the same line in Google's spam policies when they are done to manipulate rankings [1].

Reciprocal (two-way)ABC (three-way)
PatternA to B, B to AA to B, C to A
Sites involved23 or more
Visible in a link graphYes, as a direct loopLess directly, through shared ownership of B and C
Happens naturallyOften, between related sitesRarely
Google's policyLink scheme if excessive or done for rankingsSame

For the broader term, see link exchange.

Google has treated link exchanges done for rankings as a guideline violation for many years, and its enforcement has shifted from penalizing sites to discounting the links. Two changes matter most for anyone weighing an ABC exchange.

2012: Penguin targets link schemes

Google announced the Penguin update on April 24, 2012, aimed at sites that manipulated the number of links pointing at their pages through link schemes [4]. After Penguin, link building advice shifted toward links that were harder to trace, and three-way exchanges are one product of that thinking.

2016: Penguin runs in real time and discounts links

On September 23, 2016, Google made Penguin part of its core algorithm, running in real time [4]. Rather than demoting a whole site, Penguin 4.0 discounts bad links so they no longer count [4]. For an ABC exchange this means the most likely outcome is not a visible penalty but a link that stops working without notice.

Today: lost benefit cannot be regained

Google's documentation on spam updates says that when its systems remove the effect of spammy links, "any ranking benefit the links may have previously generated for your site is lost," and that those benefits "cannot be regained" [5]. A site can pass every check today and still find the exchanged links neutralized later, with no notice.

You can spot an ABC link exchange offer by who controls the return link. If the person asking for a link from your site offers a link back from a different site, and they own or manage both, it is a three-way exchange.

Common signs:

  • The offer says "we don't do direct swaps" or "no reciprocal links, it's safer."
  • The return link comes from a site with no clear owner, no real audience and outbound links to many unrelated businesses.
  • The sender offers a list of sites to "pick from" for your return link.
  • The deal requires your link to be followed (no nofollow or sponsored).

Checking the return site's traffic, the topics of its other outbound links and whether it has a real audience tells you more than the shape of the deal.

An ABC link exchange is acceptable under Google's policies only when the links are qualified so they pass no ranking credit. Google states that links covered by its link spam policy are not a violation "as long as they are qualified with a rel="nofollow" or rel="sponsored" attribute value" [1].

In practice, a three-way exchange of nofollow links has little point, because the purpose of the tactic is to pass ranking value. Partnerships that make sense without ranking value (co-marketing, cross-referrals between businesses that genuinely serve the same customers) do not need the triangle at all: two related businesses can simply link to each other where it helps readers.

If you have already taken part in ABC exchanges, stop adding new ones, review which links came from swap networks, and consider removing or qualifying the links you gave. Google's algorithms usually discount exchanged links rather than penalize, but Google also uses human review, which "can result in a manual action" [1].