Domain Authority API

Domain Authority

A 0 to 100 authority score for a domain, with every input shown: its Common Crawl web graph harmonic centrality and PageRank positions and its Majestic Million rank and referring subnets.

Get API key Read the docs

POST/v1/domain-authority

1curl -X POST https://YOUR_API_HOST/v1/domain-authority \
2  -H "Authorization: Bearer $LOOKVALID_API_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{"domain":"wikipedia.org"}'

Read docs

POST/v1/domain-authority

1const response = await fetch("https://YOUR_API_HOST/v1/domain-authority", {
2  method: "POST",
3  headers: {
4    Authorization: `Bearer ${process.env.LOOKVALID_API_KEY}`,
5    "Content-Type": "application/json",
6  },
7  body: JSON.stringify({
8    "domain": "wikipedia.org"
9  }),
10});
11const result = await response.json();
12console.log(result.found, result.data);

Read docs

POST/v1/domain-authority

1import os
2import requests
3
4response = requests.post(
5    "https://YOUR_API_HOST/v1/domain-authority",
6    headers={"Authorization": f"Bearer {os.environ['LOOKVALID_API_KEY']}"},
7    json={
8        "domain": "wikipedia.org"
9    },
10)
11result = response.json()
12print(result["found"], result["data"])

Read docs

200Captured example, 2026-10-18

1{
2  "product": "domain-authority",
3  "found": true,
4  "data": {
5    "domain": "wikipedia.org",
6    "matched_domain": "wikipedia.org",
7    "authority_score": 83,
8    "signals": {
9      "common_crawl": {
10        "in_index": true,
11        "release": "cc-main-2026-jul-aug-sep",
12        "harmonic_position": 14,
13        "harmonic_value": 21064202,
14        "pagerank_position": 35,
15        "pagerank_value": 0.0008494547219015658,
16        "hosts_in_domain": 2050,
17        "domains_in_release": 133241980,
18        "harmonic_signal": 85.9,
19        "pagerank_signal": 81
20      },
21      "majestic": {
22        "in_index": true,
23        "rank": 12,
24        "referring_subnets": 227466,
25        "referring_ips": 698536,
26        "list_size": 1000000,
27        "signal": 82
28      }
29    },
30    "formula": "authority_score = round(0.4 * harmonic + 0.2 * pagerank + 0.4 * majestic). Each signal = 100 * (1 - log10(position) / log10(list size)), so position 1 is 100 and the last position of the full list is 0. A list that does not hold the domain contributes 0. harmonic and pagerank are the Common Crawl web graph positions among all domains in the release; majestic is the Majestic Million global rank.",
31    "weights": {
32      "common_crawl_harmonic": 0.4,
33      "common_crawl_pagerank": 0.2,
34      "majestic": 0.4
35    },
36    "notes": "Scores come from open link-graph and popularity lists, not from Moz or Semrush, so they will not match those tools. Only the best-ranked domains of each list are indexed; a domain that is not found is not proof of low authority."
37  },
38  "sources": [
39    "Common Crawl Web Graph (commoncrawl.org)",
40    "Majestic Million (majestic.com/reports/majestic-million), licensed CC BY 3.0"
41  ]
42}

A real run of this lookup on 2026-10-18, using a public input. The envelope fields are left out.Read docs

10 credits per domain found in the rank data (an unranked domain is free)
Charged only when it finds something
Cached 7 days

10 credits per domain found in the rank data (an unranked domain is free)

Charged only when it finds something. A repeat inside 7 days is free.

Every LookValid product draws on one shared balance. See pricing.

From key to answer in three steps

One key, one POST to /v1/domain-authority and a JSON answer back. The same three steps work in any language that can send HTTPS.

01
Create a key
Sign up and copy a key from the dashboard. The same key works for every LookValid product and for the MCP server.
Terminal
```
export LOOKVALID_API_KEY="lv_live_..."
```

Send the request

POST a JSON body to /v1/domain-authority. 10 credits per domain found in the rank data (an unranked domain is free).

request.sh

1curl -X POST https://YOUR_API_HOST/v1/domain-authority \
2  -H "Authorization: Bearer $LOOKVALID_API_KEY" \
3  -H "Content-Type: application/json" \
4  -d '{"domain":"wikipedia.org"}'

Read the answer

A real run of this lookup on 2026-10-18. The data object has 7 named fields.

response.json

1{
2  "product": "domain-authority",
3  "found": true,
4  "data": {
5    "domain": "wikipedia.org",
6    "matched_domain": "wikipedia.org",
7    "authority_score": 83,
8    "signals": {
9      "common_crawl": {
10        "in_index": true,
11        "release": "cc-main-2026-jul-aug-sep",
12        "harmonic_position": 14,
13        "harmonic_value": 21064202,
14        "pagerank_position": 35,
15        "pagerank_value": 0.0008494547219015658,
16  ...

A structured answer, not a page of text

The data object has 7 named fields. Every response also lists the sources behind the result, the credits charged and whether it was served from your cache.

Fields returned in data by Domain Authority
Field Type
domain string
matched_domain string
authority_score integer
signals object
formula string
And 2 more fields in the API reference.
Named fields. Only domains inside the top of the open rank lists are scored; an unranked domain is not proof of low authority. It is a link-graph score, not Moz or Semrush authority.
1. Your requestone API key
2. Your cache7 daysRepeat: 0 credits
3. Data sourcefirst lookupFound: 10 credits
4. ResultJSON
A repeat lookup is free. Results are cached per account for 7 days. Ask the same question again inside that window and the response comes back with cache_hit: true and no charge.
Terminal
```
# Sent with every request, for every product
Authorization: Bearer $LOOKVALID_API_KEY
```
One key for your code and your agents. Send your API key as a Bearer token. The same key and the same credit balance cover every other LookValid product. AI agents can call it as a tool on the MCP server at https://YOUR_API_HOST/v1/mcp.

Fields returned in data by Domain Authority
Field	Type
domain	string
matched_domain	string
authority_score	integer
signals	object
formula	string

named fields in every answer

days a repeat lookup is free

lookups on the same key and balance

Latest from the changelog

All changes

Priced in credits

Every LookValid product draws on one shared balance. Domain Authority uses 10 credits per domain found in the rank data (an unranked domain is free).

See pricing Get API key

Cost

10credits

Per domain found in the rank data (an unranked domain is free)

Found10 credits
Nothing found0 credits
Repeat inside 7 days0 credits
Errors and invalid requests0 credits

Questions about Domain Authority

01How much does Domain Authority cost?

10 credits per domain found in the rank data (an unranked domain is free). Credits come out of the one balance shared by every LookValid product.

02Am I charged when nothing is found?

No. When the lookup runs and finds nothing, it returns found: false and costs 0 credits. An error costs nothing either.

03How long are results cached?

For 7 days, per account. Repeating the same lookup inside that window returns cache_hit: true and costs 0 credits.

04Which API key do I use?

The same key as every other product. Send it as a Bearer token in the Authorization header. Email hello@lookvalid.com and we set up your account and send the key.

Domain Authority

Create a key

Send the request

Read the answer

Priced in credits

Questions about Domain Authority

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