What happens when the credit runs out?

Authenticated calls return HTTP 402 until you top up. Free actions keep working. Top-ups go through USDT (TRC-20) on the account page, so there is no card to expire and nothing renews by itself.

Is there a per-second rate limit?

We do not publish a per-second quota here, and credit balance is the real throttle. Pace big loops sensibly and handle a 402 cleanly. The error table shows what each status means.

Do larger row counts cost more?

No. A call is billed once whether it returns 10 rows or 1,000. That makes per=1000 the cheapest way to read a big list, as the competitor pipe does.

Quicklinky Sign up

$0.0001 per credit

Backlink analysis Semrush users can price per call

A thousand lookups cost between $0.10 and $0.30 here. This page lays the whole bill out by action so you can price a script before you write it.

Quicklinky editorial team · Updated 2026-10-28

Rate-limit and cost table

One credit is $0.0001. Each call is billed once whatever the number of rows.
Action	Credits per call	Per 1,000 calls	Row or domain cap
`domain`, `overview`, `stats`, `suggest`	0	$0	One domain per call
`bulk_dr`	1	$0.10	2,000 domains
`compare`	1	$0.10	20 domains
`top`, `dr_distribution`, `tld_breakdown`	1	$0.10	Per call
`refdomains`, `backlinks`, `anchors`, `toppages`, `anchor_cloud`	2	$0.20	1,000 rows, depth to 50,000
`intersect`	2	$0.20	2 to 10 domains
`search`, `keyword`	3	$0.30	1,000 rows

Price check

Cheap per call, thin on everything else

If your job is link rows in a script, per-call pricing wins by a wide margin. If your job is keywords, rankings and daily crawl data, a Semrush or Ahrefs seat does things this API never will. The comparison is not apples to apples, so read the gaps table before you cancel anything.

Ahrefs API: from $129 a month for 200,000 units, at least 50 units per request
That ceiling works out to 4,000 requests a month at the minimum charge
$129 of credit here buys 1,290,000 credits, or 645,000 two-credit calls
Nothing expires monthly and there is no minimum spend

Cheap habits

Start with the free actions to confirm a domain is in the index
Batch with bulk_dr: 2,000 domains for one credit
Read lists at per=1000, because the price does not change with rows
Save responses to files instead of calling twice
Set a calendar reminder for the monthly refresh, not a daily cron

What the $100 free credit covers

Sign-up gives 1,000,000 credits and asks for no card. That is a million bulk_dr calls, or 500,000 backlinks pulls, or 333,333 search calls.

A worked example, clearly hypothetical. You track 300 donor domains. One bulk_dr call per week is 4 credits a month, about $0.0004, and a 2-credit backlinks pull on your own site every Monday takes the month to 12 credits, or $0.0012.

Even a sloppy loop that fires a thousand calls by mistake costs ten cents. Pair this with the Sheets tracker and the monthly bill is a rounding error.

Where it stops

Honest gaps against the big suites.
Need	Quicklinky	Ahrefs or Semrush
Backlinks and referring domains	Yes, from our own index	Yes, deeper history
Keyword research and rank tracking	No	Yes
Crawl freshness	Roughly monthly	Fresher, daily in places
Pricing shape	Prepaid, per call	Subscription
Domain strength	Our own DR, 0 to 100	Their own DR or Authority Score

Billing questions

What happens when the credit runs out?: Authenticated calls return HTTP 402 until you top up. Free actions keep working. Top-ups go through USDT (TRC-20) on the account page, so there is no card to expire and nothing renews by itself.
Is there a per-second rate limit?: We do not publish a per-second quota here, and credit balance is the real throttle. Pace big loops sensibly and handle a 402 cleanly. The error table shows what each status means.
Do larger row counts cost more?: No. A call is billed once whether it returns 10 rows or 1,000. That makes per=1000 the cheapest way to read a big list, as the competitor pipe does.