On-page SEO audit + score
API · /seo-api
SEO API
healthy
3,916 Subscribers
Run an on-page SEO audit on any URL — title and meta-description analysis, heading structure, content length, image alt coverage, canonical / viewport / Open Graph checks and an internal/external link breakdown — with an overall 0–100 score. Plus a dedicated link analysis endpoint.
api.oanor.com/seo-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 513 ms
- Server probes · 24h
- Subscribers
- 3,916
- active
- Total calls
- 40
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 600 calls / month
- 1 requests / second
- Hard cap (429 above quota, no overage)
- 600 audits/month
- 1 req/sec
- Full on-page score + meta checks
- No credit card
Basic
€16.00 /month
- 25,000 calls / month
- 5 requests / second
- Hard cap (429 above quota, no overage)
- 25,000 audits/month
- 5 req/sec
- All on-page checks + link breakdown
- Commercial use allowed
Pro
€49.00 /month
- 120,000 calls / month
- 15 requests / second
- Hard cap (429 above quota, no overage)
- 120,000 audits/month
- 15 req/sec
- Bulk-URL auditing
- Email support
Mega
€129.00 /month
- 500,000 calls / month
- 40 requests / second
- Hard cap (429 above quota, no overage)
- 500,000 audits/month
- 40 req/sec
- Priority queue + 99.9% SLA
- Priority support
Built by
Related APIs
Other APIs with overlapping tags.
Google Trends API
Live trending Google searches by country, with no key. This reads Google's own public Daily Search Trends RSS feed and returns it as clean JSON: what people are searching for right now in any country, each trend with its approximate search volume, the news stories driving it and a representative image. The trending endpoint lists the current trending searches for a country (term-centric, ranked, with volume and the top news story); the news endpoint flattens the news articles powering those trends (article-centric — the "what is driving search right now" view, each article tagged with its trend, source and link); and the geos endpoint lists the supported countries. The real-time search-interest / trends-discovery layer for news, marketing, SEO, social-listening and content tools. Distinct from wiki-pageview and platform-specific trend APIs — this is Google web-search trends. Live from Google Trends; short cache only.
api.oanor.com/googletrends-api
URL Canonicalize API
Normalize URLs to a canonical form so you can deduplicate, compare and clean them. The canonicalize endpoint lower-cases the scheme and host, drops the default port (80 for http, 443 for https), resolves ./ and ../ path segments and fixes percent-encoding using the standard WHATWG URL parser, then applies the cleanups you choose: strip marketing and analytics tracking parameters (all utm_* plus gclid, fbclid, msclkid, yclid, mc_eid and many more), sort the remaining query parameters into a stable order, optionally drop the #fragment, and add or remove the trailing slash. It returns the canonical URL, the fully parsed components and the exact list of changes it made. The compare endpoint canonicalizes two URLs and tells you whether they point to the same resource — perfect for catching duplicate links that differ only by tracking codes, casing, port or parameter order. Everything is computed locally with no network calls, so it is instant, private and safe. Ideal for crawlers and SEO tooling, link deduplication and analytics, cache keys, bookmarking and content pipelines. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This canonicalizes the URL string; it does not fetch it or follow redirects — for link previews and unshortening use a URL-unfurl API.
api.oanor.com/urlcanon-api
JSON-LD API
Generate valid schema.org JSON-LD structured data from simple fields — the markup Google and other search engines use for rich results. The generate endpoint builds ready-to-embed JSON-LD for the types that matter most for SEO: Article (and BlogPosting / NewsArticle) with author and publisher, Product with offers, price, availability and an aggregate rating, Organization and LocalBusiness with postal address and opening hours, Person, WebSite with a Sitelinks search box (SearchAction), BreadcrumbList, FAQPage, Event and Recipe with ingredients and step-by-step instructions. Pass plain fields — or JSON arrays and newline lists for breadcrumbs, FAQ questions, ingredients and social profiles — and get back a clean JSON-LD object, optionally wrapped in a ready-to-paste <script type="application/ld+json"> tag. The types endpoint documents every supported type and its fields. Everything is assembled locally and deterministically, so it is instant and private. Ideal for CMS and static-site pipelines, SEO tooling, e-commerce product pages, documentation and content platforms. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This GENERATES schema.org markup; to extract structured data or Open Graph tags from a page use an HTML-parsing API, and to audit on-page SEO use an SEO API.
api.oanor.com/jsonld-api
Title Case API
Convert a heading to proper headline (title) case the way editors do — not a naive capitalise-every-word. It capitalises the first and last words and all the major words, while keeping articles (a, an, the), coordinating conjunctions (and, but, or…) and prepositions lowercase, and always capitalises the word right after a colon. Choose AP style (lowercases short prepositions, capitalises longer ones) or Chicago style (lowercases prepositions of any length). Hyphenated compounds such as well-known and state-of-the-art are handled correctly. Perfect for article and blog titles, headings, SEO meta titles, product and section names, and CMS tooling. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. Distinct from a plain title/sentence case converter, which capitalises every word.
api.oanor.com/titlecase-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for SEO API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call SEO API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for SEO API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does SEO API cost?
SEO API has a free tier with 100 calls / month. Paid plans start at €16.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is SEO API GDPR-compliant?
All requests to SEO API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/seo-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/seo-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/seo-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);import requests
r = requests.get(
"https://api.oanor.com/seo-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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