What does the SEO checker API evaluate?

Classic on-page signals from static HTML: title, meta description, headings, HTTPS, canonical, Open Graph, and related heuristics. It does not predict Google rankings.

How do I call the SEO checker?

POST JSON {"url":"https://example.com"} to /api/v1/seo-checks with Authorization: Bearer .

Soni API · On-page SEO audit

SEO Checker API

Fetch a public URL and receive an on-page SEO score, rating, findings, and concrete improvements — as JSON. Heuristic audit only; not a search-ranking prediction.

Get a free API key Open OpenAPI docs Link checker API

What you get

POST /api/v1/seo-checks · 60 requests / hour · SSRF-aware

Score & rating

0–100 score with a human-readable rating so you can threshold alerts in CI or dashboards.

Findings

Structured issues (e.g. missing description, short title, incomplete Open Graph) with severity and recommendations.

Honest limits

Static HTML only. No guarantee of rankings, traffic, or completeness. See the disclaimer.

Related: online link checker API · GEO checker API for AI-search readiness.