SEO APIs.
An SEO API lets software read and act on search performance data programmatically — checking where a page ranks, auditing technical health, generating metadata, or pulling backlink and keyword figures — without anyone opening a dashboard. The alternative is scraping search results yourself and owning that scraper forever.
Also called a search API, SERP API, rank tracking API or search visibility API34 services in this categorySEO APIs
34 servicesReadability Scores API
Analyze plain text for readability metrics, reading time, and language-specific scores for English or German content.
SERP Rank Checker API
Get ranked search results for a keyword with language and location filters. Useful for SEO research, rank tracking, and competitor analysis.
Advanced Website Similarity Analysis API
Compare website URLs and get similarity scores, SEO scores, summaries, and suggested improvements for each site. Useful for overlap checks and audits.
Webpage Technical Performance Audit API
Audit a webpage URL and get canonical, robots.txt, SSL status, performance_score, issues, and overall_score for technical SEO checks.
Extract Structured Data API
Extract schema metadata from a URL, including schema count, breadcrumbs, organization flags, and structured data objects for SEO checks.
Security Header Full Audit API
Check a URL for CSP, HSTS, and X-Frame-Options, with a score and fix recommendations for missing security headers.
Technical Comparison of Webpages API
Compare two or more website URLs and get technical SEO signals for each page, including metadata, headings, links, images, SSL, mobile, and load time.
Security Headers Audit API
Check a webpage URL for common security headers and get an overall score. Returns booleans for CSP, HSTS, referrer policy, X-Frame-Options, and more.
Full Site Audit API
Audit a webpage by URL and get SEO metadata, tech stack, performance metrics, broken links, security headers, and mobile-friendly status.
Detect Tech Stack API
Detect the technologies used by a webpage from a URL. Returns the source URL and a list of detected technologies for audits and research.
Validate Schema API
Check a webpage’s structured data and metadata from a URL. Returns JSON-LD, microdata, Open Graph, Twitter card, and SEO summary fields.
Validate HTML API
Validate raw HTML for structured data and get JSON-LD, microdata, meta tags, Open Graph, Twitter card, and a validation summary.
Which SEO API do you need?
The question you arrived with, and the endpoint that answers it.