6 providers · from $0.0025 per call · $0.000 markup

Backlink API: the backlink profile of a domain from Moz, DataForSEO, Serpstat, SE Ranking, Majestic or Semrush, per call

Give your agent a domain and get its backlink profile back as one row: total backlinks, referring domains, follow and nofollow split, the vendor's authority score and, from some providers, the spam and anchor breakdowns. 6 providers answer through one treg.to key, from $0.0025, each at its own rate with no markup and none of them behind a monthly plan or a credit reset. Ahrefs is not among them. Every index is that vendor's own crawl, so the counts differ by design, and the page shows them side by side rather than picking one.

Start free See the comparison

$1.00 of free credit on every new team · no provider signup · no card

3 of 6 endpoints on this page are live-verified against the provider.

compared on this page

Try it

What’s the best way to ask ChatGPT?

1Set your agent up, once

in your agent's chat

set up treg — https://treg.to/llms.txt

2Ask for the job

the prompt

Using treg, get the backlink summary for our domain and our three main competitors from the cheapest verified provider, show me the price first, then put referring domains, follow share and the authority score in one table and tell me where the gap is widest.

works in

Why this prompt works

Give bare domains

Most rows want the domain without scheme or www, and a page URL where you mean a page. Say which, or the agent guesses.

One call per domain

Each provider prices the summary per target, and the dearest per-call row is ten times the cheapest. Four domains is four calls.

Name the score you mean

Moz DA, Majestic Trust Flow, Semrush Authority Score: each belongs to its vendor and compares only to itself. Ask for one and stick to it.

Ask for the price first

treg.to returns the rate before the call, so the agent can say what a thousand expired domains will spend before it starts.

Why treg.to

Why go through treg.to

One key, not 9 accounts

treg.to holds the provider keys. Neither you nor the agent sees them.

Price before the call

The provider's own rate, $0.000 markup, from a prepaid balance.

No subscription, no seats

Charged per call. $1.00 free per new team, no card to start.

Your own keys are free

Already pay Hunter? Register it and those calls are never metered.

Switch by changing a word

Another provider is a different word in the prompt, not a new integration.

Nothing to integrate

No SDK, no OAuth dance per vendor, no seats.

Behind the scenes

What ChatGPT sees before it calls

treg.to does not choose for you. It hands ChatGPT this comparison, with the price shown before any call, and ChatGPT picks. Or you tell it how: "cheapest", "most reliable", "the one that takes what I have", or a provider by name.

Which backlink API is cheapest per call?

Cheapest per call

Serpstat at $0.0025

Cheapest per result

Majestic at $0.0008

Those units are not interchangeable: one call can return many results, so compare on the unit you will actually be billed in.

Which backlink API is the most reliable?

Provider	Success	Median	Sample
Moz	100%	502ms	13 calls
DataForSEO	100%	643ms	184 calls
Serpstat	100%	981ms	121 calls
SE Ranking	100%	1.2s	24 calls

Measured on treg.to traffic: real calls, real inputs, and sample sizes differ by provider. Live reliability, not a controlled benchmark.

How do the backlink providers compare?

Provider	Price	Accepts	Success rate	Verified
Majestic	$0.0008 per result	cmd, items, item0, datasource	(2 calls)	unverified
Serpstat	$0.0025 per call	method, params, id, params.query, params.searchType	100% (121 calls)	unverified
Moz	$0.0133 per call	targets, distributions	100% (13 calls)	2026-07-31
SE Ranking	$0.0179 per result	target, mode	100% (24 calls)	2026-07-31
DataForSEO	$0.024 per call	target, include_subdomains, include_indirect_links, exclude_internal_backlinks, backlinks_status_type, internal_list_limit	100% (184 calls)	2026-07-28
Semrush	no dollar rate published	type, target, target_type, export_columns, export_escape	not yet measured	unverified

Run one

the cheapest verified call

treg call serpstat.web.backlinks.summary

Swap the id for any provider above. All 6 endpoints behind this job, with their parameters and captured responses, are on the Backlinks, authority & domain metrics shelf.

How these numbers are made

PricesEach provider’s own published rate, converted to US dollars for one chargeable event of the unit they bill in. treg.to adds $0.000. Where a provider bills in credits, the conversion uses the rate on their public pricing page, last checked 2026-07-31.

Success ratetreg.to’s own served calls over the last 30 days: 2xx counts as a success, 5xx and timeouts as a failure. A 4xx is excluded, because it usually means the caller sent bad parameters and one bad query should not make a healthy endpoint look broken.

What this is notA controlled benchmark. These are real calls with real inputs, so sample sizes and the difficulty of what was asked differ by provider. Treat the rates as live reliability, not a like-for-like test.

VerifiedThe date treg.to last called the endpoint end to end and confirmed the shape of its response and the price it charged.

From the field

What people actually struggle with

Backlink threads are among the most seeded in SEO: of the ~163 Reddit and X posts read in August 2026, one vendor's ring ran to eleven posts across five subreddits with the same template, and link sellers filled most of the rest. These five are people paying for the data themselves.

The API plan is priced for a different kind of company

“Don't really want to drop $14K to have access to the ahrefs API” r/bigseo

What this page can do about it: That is a plan, and here there is none. A summary is a call, priced per call at the provider's rate, from a prepaid balance with no minimum and no tier to unlock.

Credits reset on the vendor's calendar, not yours

“two more weeks until my @ahrefs API credits reset. BRUTAL. this may push me to the $449/mo plan.” X

What this page can do about it: Nothing here resets. The balance is money, it is spent per call, and the rate is printed before the agent spends it. When it runs out you top it up; you do not wait.

Whose data do you trust for link building?

“Just started testing APIs for backlinks of the two.. Which ones data do you prefer when it comes to linkbuilding?” r/SEO

What this page can do about it: No comparison table can answer that for your niche. The cheap experiment is on this page: pull the same domain from Serpstat, Moz and DataForSEO for a few cents and see which index has the links you know exist.

A hundred domains a day makes the seat price absurd

“DA checks are way too expensive at volume” r/Domains, 7 points

What this page can do about it: At volume the per-call rate is the whole story: Moz's DA row is two quota rows a call, and the cheaper summaries here carry their own vendor's score. An agent looping a list of expired domains is the fit; the price of the loop is the rate times the list.

If DR is gameable, which score is not?

“If Ahrefs DR should be ignored, then which “domain rating” you should care about?” X

What this page can do about it: None of them is more than its vendor's model, and this page will not crown one. What it can do is put four vendors' scores for the same domain in one table, with the referring-domain counts beside them, so the agent shows its working.

The detail

What actually differs

Per-call is the point.

The forum's problem is not the data, it is the plan: an API tier priced for enterprises, a credit allowance that resets in two weeks, a seat that costs hundreds a month for one column. Here Serpstat's summary is $0.0025 a call, Moz's two quota rows come to $0.0133, SE Ranking's 100 credits to $0.0179 per target and DataForSEO's request to $0.024 plus a fraction of a cent per returned row, metered from a prepaid balance at the provider's rate with $0.000 added. A new team's free dollar is a few hundred Serpstat summaries.

Two rows are the odd ones.

Majestic charges one index item unit per target, and it is the same command as its URL metrics call, so ask for one and read both sets of columns rather than paying twice. Semrush charges 40 API units flat for the overview and publishes no dollar rate for a unit, so the page prints no price and it runs on your own Semrush plan. Neither has been called live through treg.to yet; the other four have, and the measured success rates on this page come from that traffic.

The columns are not the same shape.

Moz's call is its URL metrics with distributions on, which adds histograms by domain authority, spam score and root domains; SE Ranking's summary is ten times the price of its metrics call and adds the full breakdown, so use metrics when you only need totals; DataForSEO returns the counts, rank and spam score with breakdown arrays you can cap. Read the docs linked on each row before the agent loops.

Background

What is a backlink API?

A backlink API returns what a link index knows about a domain or a page as data: how many pages link to it, from how many distinct domains, how many of those links pass authority, and a score the vendor computes from all of it. The summary endpoint on this page is the one-row version, the profile rather than the list of links; the list is a different job. Each provider runs its own crawler and its own index, so DataForSEO, Moz, Serpstat, SE Ranking, Majestic and Semrush will each give a different referring-domain count for the same domain, and none of them is the count. Ahrefs, the index most of the forum pays for, is not in the catalog.

Questions

Before you start

Is there an Ahrefs API here?

No. Ahrefs is not in the catalog, and this page does not resell or proxy it. The six indexes here are the alternatives, each priced per call at its own rate, and the honest note is that their counts and scores are theirs, not Ahrefs'.

Why do the backlink counts differ between providers?

Because each provider crawls the web itself and keeps its own index. A link one crawler found last week is one another has not reached. There is no correct count; pick one index and compare domains within it, or pull two and treat the overlap as the confident set.

Is Domain Authority in the response?

Moz's DA is in Moz's row, and only there; Majestic returns Trust Flow and Citation Flow, Semrush its Authority Score, DataForSEO and SE Ranking their own rank. Each score is comparable only to itself, and no provider's number should be read as another's.

Which provider should my agent use?

The one whose columns match the question and whose rate fits the volume. treg.to shows all six side by side with the rate and the measured success; it compares, it does not route or fail over for you.