Domain Authority Checker API: Ahrefs DR, Moz DA, Majestic TF & Semrush AS in One Call
Seo Era is a bulk domain authority checker API that returns Ahrefs Domain Rating, Moz Domain Authority, Majestic Trust Flow and Semrush Authority Score for up to 100 domains in a single request — with fresh data on every call. Available exclusively on RapidAPI.
- Authority metrics
- 4
- Authority metrics
- Domains per request
- 100
- Domains per request
- REST endpoints
- 5
- REST endpoints
- Cached responses
- 0
- Cached responses
Plans on RapidAPI — from $9/month
Two bundles, three sizes each. Subscriptions, billing and keys are handled by RapidAPI.
DR + DA + TF bundle
Basic
For individuals and small projects • DR + DA + TF
1,500 domains / month
$0.006 per domain
- Ahrefs DR + Moz DA + Majestic TF
- Up to 100 domains per request
- Fresh data on every call
- 1 credit per scored domain
- Email support
Pro
For growing businesses • DR + DA + TF
5,000 domains / month
$0.006 per domain
- Ahrefs DR + Moz DA + Majestic TF
- Up to 100 domains per request
- Fresh data on every call
- 1 credit per scored domain
- Priority support
Mega
For enterprise and high-volume • DR + DA + TF
25,000 domains / month
$0.004 per domain
- Ahrefs DR + Moz DA + Majestic TF
- Up to 100 domains per request
- Fresh data on every call
- 1 credit per scored domain
- Dedicated support
All 4 metrics bundle (adds Semrush AS)
Basic
For individuals and small projects • DR + DA + TF + AS
700 domains / month
$0.020 per domain
- Ahrefs DR + Moz DA + Majestic TF + Semrush AS
- Up to 100 domains per request
- Fresh data on every call
- 1 credit per scored domain
- $0.020 per extra domain (overage)
- Email support
Pro
For growing businesses • DR + DA + TF + AS
2,000 domains / month
$0.020 per domain
- Ahrefs DR + Moz DA + Majestic TF + Semrush AS
- Up to 100 domains per request
- Fresh data on every call
- 1 credit per scored domain
- $0.020 per extra domain (overage)
- Priority support
Mega
For enterprise and high-volume • DR + DA + TF + AS
8,000 domains / month
$0.020 per domain
- Ahrefs DR + Moz DA + Majestic TF + Semrush AS
- Up to 100 domains per request
- Fresh data on every call
- 1 credit per scored domain
- $0.020 per extra domain (overage)
- Dedicated support
Need more than 25,000 domains/month? Contact us for custom volume.
What is a domain authority checker API?
A domain authority checker API is a web service that returns third-party authority scores — such as Ahrefs DR, Moz DA, Majestic TF and Semrush AS — for a given domain in machine-readable JSON. Instead of looking domains up one at a time in separate tools, developers query the API and get backlink authority metrics for entire lists at once.
Key takeaways
One API call returns all four metrics — Ahrefs DR, Moz DA, Majestic TF and Semrush AS — for up to 100 domains.
Data is fetched fresh on every request, so scores reflect the latest available values, not cached snapshots.
Billing runs through RapidAPI: a domain costs one credit only when it returns at least one score.
All the metrics that matter
One unified API for every authority score — charged per domain, not per metric
Ahrefs Domain Rating (DR)
Ahrefs' backlink-strength score, built from the quantity and quality of unique domains linking to a site. The industry standard for pricing links and triaging outreach prospects.
Scale 0–100
Read more →Moz Domain Authority (DA)
Moz's predictive score estimating how likely a domain is to rank in search relative to every other domain in the index. Best used for comparing sites within a niche.
Scale 0–100
Read more →Majestic Trust Flow (TF)
Majestic's link-quality score based on how closely a site is connected to a curated set of trusted seed domains. The hardest metric to fake — the go-to for spam detection.
Scale 0–100
Read more →Semrush Authority Score (AS)
Semrush's composite score blending link power, organic traffic signals and spam factors into a single authority estimate. Useful as a sanity check on the other three.
Scale 0–100
Read more →Ahrefs DR vs Moz DA vs Majestic TF vs Semrush AS
Each metric measures authority differently — use them together
| Metric | What it measures | Based on | Best for |
|---|---|---|---|
| Ahrefs DR | Backlink profile strength | Quantity and authority of linking domains | Link buying, outreach triage |
| Moz DA | Predicted ranking potential | ML model trained on ranking outcomes | Guest-post vetting, niche comparison |
| Majestic TF | Link trust and quality | Proximity to trusted seed sites | Spam detection, expired domains |
| Semrush AS | Overall domain authority | Link power + traffic + spam factors | Benchmarking, sanity checks |
Who uses authority metrics
One score set, four kinds of decisions
SEO Agencies
Benchmark clients against competitors and report authority trends stakeholders actually understand.
Link Builders
Vet prospects before you pay for placements — Ahrefs DR for price, Majestic TF to catch manufactured authority.
Domain Investors
Screen expired and aftermarket domains for real authority — and inherited link spam — before you bid.
SaaS & Tool Builders
Embed authority metrics in your product — prospect filters, lead scoring, dashboard widgets — via one API.
Why developers choose Seo Era for bulk authority checks
Everything you need to integrate domain metrics into your application
Always Fresh Data
Every request fetches live metrics directly from the source — no stale or cached results, ever.
Batch Processing
Query up to 100 domains in a single request. Deduplication and normalization built in.
Pay Only for Results
A domain is charged once when it returns at least one score — failed lookups cost nothing.
Check domain authority with curl
One POST request returns DR, DA, TF and AS for every domain — see the docs for JavaScript and Python examples.
RESTful API with JSON responses
Idempotent requests — safe retries
Real-time usage dashboard
curl -X POST https://api.seoera.io/api/v1/authority \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"domains": ["example.com", "google.com"]}'Frequently asked questions
Can I check Ahrefs DR without an Ahrefs subscription?
Yes. Seo Era returns Ahrefs Domain Rating through a simple REST API — no Ahrefs account or subscription needed. You subscribe once on RapidAPI and get DR alongside the other metrics in a single call.
How do I check Moz DA in bulk?
Send up to 100 domains in one POST request and get Moz Domain Authority for all of them in a single JSON response — no scraping, no rate-limit juggling, no manual lookups.
Is this a free domain authority checker?
No — Seo Era is a paid API. Plans start at $9/month for 1,500 domains on RapidAPI, and there is no free tier. You only pay for domains that return at least one metric score.
Which is better, DR or DA?
Neither is "better" — they measure different things. Ahrefs DR is a pure backlink-strength score and the standard for pricing link placements. Moz DA is a predictive ranking-potential score better suited to comparing sites within a niche. Most teams check both, plus TF for spam detection.
How accurate are the scores?
Seo Era fetches metrics live at request time rather than serving cached snapshots, so you get the freshest value each provider publishes. Scores are relative industry metrics — accurate for comparing domains, not absolute Google signals.
Ready to get started?
Subscribe on RapidAPI and get your key in minutes.