Domain Authority API — score any site's search footprint
One domain in. Authority score, organic and paid keyword counts, estimated monthly traffic and what that traffic is worth. Flat priced, no SEO platform subscription required.
What Domain Authority gives you
A single authority number
A 0-100 score derived from the domain's search rank, so higher always means stronger. The raw rank is returned too, for teams that prefer it.
- 0-100 authority score
- Raw Semrush rank
- Comparable across domains
- Stable methodology
Real traffic, not a guess
Estimated monthly organic visits and the number of keywords driving them, straight from a live search index rather than a crawl heuristic.
- Organic traffic estimate
- Organic keyword count
- Paid traffic estimate
- Paid keyword count
Traffic value in dollars
What the organic traffic would cost to buy through paid search. The fastest way to express SEO performance to someone who thinks in budget.
- Organic traffic value
- Paid traffic cost
- Paid vs organic share
- Board-ready numbers
An ad-spend signal
Whether a domain buys paid search at all, and how much of its traffic is paid. A reliable indicator that a company has budget and is actively acquiring.
- Runs paid ads flag
- Paid traffic share
- Budget qualification
- Competitive intel
No platform subscription
Access the same underlying index without an annual SEO platform contract or unit packs that expire at the end of every month.
- Pay per lookup
- No annual plan
- Credits never expire
- No seat licences
Built for bulk
Flat per-domain pricing means a 50,000-row CSV costs exactly 50,000 times one lookup. No result multipliers, no surprises.
- Bulk CSV supported
- Perfectly linear cost
- One row in, one row out
- Downloadable results
One endpoint. A domain in, structured data out.
Same authentication, same credit balance, and the same response envelope as every other 1Lookup product. If you have already integrated one endpoint, this one is a URL change.
curl -X POST https://api.1lookup.io/v1/domain-authority \
-H "Authorization: Bearer $API_KEY" \
-H "Content-Type: application/json" \
-d '{ "domain": "stripe.com" }'{
"classification": {
"found": true,
"domain": "stripe.com",
"authority_score": 84,
"semrush_rank": 1285,
"organic_traffic": 2009909,
"runs_paid_ads": true
},
"insights": {
"domain_authority_result": {
"organic_keywords": 330504,
"organic_traffic_value_usd": 11907535,
"paid_keywords": 1444,
"paid_traffic": 132067,
"paid_share": 0.0617
}
}
}Every field you get back
No hidden tiers. Every field below is returned on a successful lookup at the price shown above.
Authority
- authority_score
- semrush_rank
- domain
- database
Organic search
- organic_keywords
- organic_traffic
- organic_traffic_value_usd
Paid search
- paid_keywords
- paid_traffic
- paid_traffic_cost_usd
- paid_share
Who uses Domain Authority
Agencies qualifying inbound leads
A prospect fills in a form. Before the first call you know whether their site gets 500 visits a month or 500,000, and whether they already spend on ads — which tells you the budget conversation before you have it.
Link builders vetting prospects
Score a list of potential link targets by real search performance instead of a crawl-based authority proxy, and drop the domains with no measurable traffic.
Sales teams scoring accounts
Add domain strength and paid-ad activity as fields in your lead scoring model. Companies that invest in acquisition are companies with budget.
M&A and investment diligence
Quantify how much of a target's traffic is earned versus bought, and what replacing that organic traffic with ads would cost each month.
Frequently asked questions
What is a domain authority API?
A domain authority API scores how strong a website is in search. This one returns the domain's overall search rank, how many organic and paid keywords it ranks for, its estimated monthly traffic, and what that traffic would cost to buy through ads.
Where does the data come from?
Semrush's search index, accessed per call. That matters commercially: Semrush's own API requires an annual plan plus separately purchased unit packs that expire monthly. Here you pay 10 credits per lookup with no plan, no minimum and no expiry.
What is the authority score and how is it calculated?
It is a 0-100 score we derive from the domain's Semrush rank on a logarithmic scale, so that a higher number always means a stronger domain. The raw Semrush rank is returned alongside it, because on that metric lower is stronger and mixing the two up is a common mistake.
How much does each lookup cost?
10 credits per domain, the same as Domain SEO Intelligence. On the Growth plan that is about $0.035 per lookup, and credits are shared with every other product and roll over.
Can I check thousands of domains at once?
Yes. Domain Authority is available in the bulk CSV pipeline. Upload a column of domains and get a file back with every metric appended. Cost is exactly linear because the upstream price is flat per domain with no row multiplier.
How is this different from Domain SEO Intelligence?
Domain SEO Intelligence aggregates third-party authority metrics such as Moz DA, Ahrefs DR and Majestic TF/CF. Domain Authority instead measures the domain's actual search footprint: real keyword counts, traffic estimates and traffic value. Most teams run both — one for link authority, one for measured performance.