$100 free credit on sign-up, no card. Link data from $0.0001 per call.

798.5 billion backlinks indexed

SEO tool center for a stack that bills per call

Your team probably pays for seats it opens twice a month. We index 181,132,097 domains, so link data can be bought by the call instead, from $0.10 per 1,000 requests.

Get $100 free See the $100 and $1,000 budgets

Free DR lookup, no key and no card
Backlink, anchor and referring-domain calls from 1 to 3 credits
Prepaid balance, no subscription or monthly minimum

GET /api.php?action=domainJSON

$ curl "https://aseotools.com/api.php?action=overview&q=nytimes.com&key=sk_live_..."

What it is for

An SEO tool center is a stack with the link layer swapped out

Most teams do not need a new suite. They need the one layer that burns money in a subscription, the link data, moved to a meter.

Replace a seat, keep the suite
Keep Ahrefs or Semrush for keywords and rank tracking. Move the backlink pulls that scripts and sheets make into an API. The seat count then stops growing.
Audit before you buy
Check ten competitors with the free actions, which need no key at all. If the numbers answer your question, you never spend a cent.
Price each job in credits
A bulk DR pass over 2,000 domains is one credit, which is $0.0001. A full referring-domain list is two. Put those numbers in the sheet your finance person reads.
Plug it into what you run
The API is plain REST with JSON replies and open CORS. A cron job, a Make scenario, an n8n flow or a Google Sheet can all call it without an SDK.

domains in our own link index: 181,132,097
domain-to-domain links: 2,774,625,913
per credit, 1,000,000 free on sign-up: $0.0001
domains in one bulk_dr call: 2,000

How it works

From first look to a metered workflow in four moves

Type your own domain above

The checker calls the free domain action and returns DR plus referring-domain counts. It takes seconds and asks for nothing.

List the pulls you repeat

Write down every backlink export someone on the team makes each month, who makes it and why. That list is your real requirement, not the feature grid of a suite.

Cost the list in credits

Use the table on the per-call cost page to turn each pull into dollars. Most months land under one dollar.

Sign in with Google and test

The account comes with $100 in credit and needs no card. Run one real month of pulls, then decide whether the subscription still earns its seat.

Who it is for

Where a metered API beats a seat, and where it does not

Subscriptions win when many people click around all day. APIs win when a machine asks the same question on a schedule. Mixed teams need both. Fine.

Take a team of six that checks backlinks for a client report once a month, with about forty clients and two credits per export. That is eighty credits, or $0.008. The figure is an example, not a customer. Seats price the people, calls price the work.

The limits are plain. Our index refreshes roughly once a month, so a link won last week may be missing. We do not do keywords, rank tracking or a daily-fresh crawl, and for those Ahrefs and Semrush are the fuller products. Read which jobs move off a Semrush seat before you cancel anything.

Compare

Subscription seat versus metered link data

Question	Suite subscription	Per-call API
How you pay	Monthly plan, API units bundled in	Prepaid credit, 1 credit = $0.0001
Entry cost for API access	Ahrefs: from $129/month for 200,000 units	$0, with $100 free credit
Minimum cost per request	Ahrefs: at least 50 units per request	1 to 3 credits, whatever the row count
Keywords and rank tracking	Yes, the stronger choice	Not offered
Data freshness	Daily-fresh crawl in the big suites	Monthly refresh
Idle month	Still billed	Costs nothing

One call to see what it returns

Replace the key with your own. The overview action is free and needs none, so try it first.

bash

curl "https://aseotools.com/api.php?action=overview&q=nytimes.com&key=sk_live_..."

# 1 credit, up to 2,000 domains per call
curl "https://aseotools.com/api.php?action=bulk_dr&domains=a.com,b.com&key=sk_live_..."

FAQ

Questions teams ask before changing a stack

What is an SEO tool center and do I need one?

It is one place where your team keeps its checks, budgets and API calls, instead of ten tabs and five logins. You need one when more than two people pull link data. Start with a list of repeat tasks, then price each task in credits.

Can an API really replace my Ahrefs or Semrush subscription?

Only for the link-data part. Keyword research, rank tracking and a daily-fresh crawl stay with the big suites. If most of your seat's value is backlink exports run by scripts, a per-call API is the cheaper way to get them.

How much does a month of backlink pulls cost?

It depends on the job. Referring domains and backlinks cost 2 credits per call, a bulk DR check costs 1 credit for up to 2,000 domains. One credit is $0.0001, so a month of client reports often stays under a dollar.

Is the domain rating the same as Ahrefs DR?

No. It is our own metric, round(100 times log(ref_domains+1) divided by log(2 times 10^7)). It sits on a log scale like Ahrefs DR or Moz DA and tells the same story, but the numbers will not match digit for digit.

Do I need a credit card to test it?

No. Sign in with a Google account and $100 in free credit appears, which is 1,000,000 credits. Top-ups later use USDT on TRC-20 from the account page. There is no subscription and no monthly minimum.

How fresh is the link data?

The index refreshes about once a month. A link placed last week may not appear yet, and one that vanished may linger. For daily monitoring of a launch, pair this with Google Search Console.