InstaRank SEO
Domain Authority API

Domain Authority API

Score any domain 0–100 on a composite of trust, authority, content, and technical signals — with the full breakdown that produced the number.

POST/api/v1/domain-authority$0.008 per checkscope domain:read
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Quick start

One request, structured JSON back

Request
curl -X POST https://instarankseo.com/api/v1/domain-authority \
  -H "X-API-Key: isk_your_key_here" \
  -H "Content-Type: application/json" \
  -d '{"domain": "example.com"}'
Response
{
  "success": true,
  "domain": "example.com",
  "domainAuthority": 64,
  "tier": "Strong",
  "components": {
    "trust": { "score": 71, "weight": 0.3, "weighted": 21 },
    "authority": { "score": 52, "weight": 0.4, "weighted": 21, "domainRank": 38 },
    "content": { "score": 78, "weight": 0.15, "weighted": 12 },
    "technical": { "score": 95, "weight": 0.15, "weighted": 14 }
  },
  "meta": { "creditsUsed": 8, "creditsRemaining": 18992, "apiVersion": "1.0" }
}
Reference

Parameters

FieldTypeRequiredDescription
domainstringrequiredTarget domain (hostname or URL).
Why this API

Built for builders

One transparent score

A single 0–100 number with a human-readable tier (Exceptional → Very Weak) you can drop straight into dashboards and qualification rules.

Full breakdown, not a black box

See exactly how trust (30%), authority (40%), content (15%), and technical (15%) each contributed — including domain rank and referring domains.

Live signals

Authority uses real backlink data; technical and content are measured from the live homepage at request time, so the score reflects the site as it is now.

Transparent

Pricing & limits

Price

$0.008 per check

8 credits per check

Billed from one credit wallet. Failed upstream calls are refunded automatically.

Rate limits

  • Free10 / min
  • SEO+60 / min
  • Agency120 / min

Surfaced as X-RateLimit-* headers on every response.

Errors

Every non-2xx shares one envelope with a machine-readable code, a retryable flag, and a requestId for tracing.

Send an Idempotency-Key header to retry POSTs safely without double-charging.

A fully transparent authority score — every component is shown and weighted, so you trust the number instead of guessing at a proprietary metric.

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FAQ

Domain Authority API FAQ

Common questions about the Domain Authority API — pricing, auth, and what it returns.

  • How is the domain authority score calculated?

    It is a weighted composite of four components, each scored 0–100: trust (30%), authority (40%), content (15%), and technical (15%). The response shows every component's score and weighted contribution, so the final 0–100 number is fully transparent.

  • What does the tier mean?

    The tier is a label for the score band: 80–100 Exceptional, 60–79 Strong, 40–59 Moderate, 20–39 Weak, and 0–19 Very Weak — a quick way to bucket domains without reading the raw number.

  • How much does it cost?

    Eight credits per check, which is $0.008 at the standard rate.

  • Is the score live or cached?

    Authority draws on current backlink data, while the content and technical components are measured from the live homepage at the moment you call the API, so the score reflects the site's present state.

  • Which scope is required?

    The domain:read scope on your API key, sent in the X-API-Key header.