Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Strong 4 Solid coverage with minor gaps

Yoast Metadata APIThe Yoast Metadata API provides a PHP interface to add, alter, or remove metadata in the of a WordPress do...62.5 Yoast Schema APIThe Yoast Schema API provides a PHP interface for customizing the Schema.org JSON-LD structured data output...62.5 Yoast Surfaces APIThe Yoast Surfaces API provides a PHP interface for retrieving SEO metadata programmatically within WordPre...62.5 SE Ranking MCP ServerHosted remote Model Context Protocol server exposing 217 tools and 5 prompts across three SE Ranking surfac...59.6

Developing 8 Usable, with meaningful gaps to close

Oxylabs SERP Scraper APISearch-engine results page scraping for Google (Search, Ads, Images, Lens, Maps, Suggest, Shopping, Travel,...54.1 CrawlGraph MCP ServerHosted remote Model Context Protocol server at https://crawlgraph.com/mcp over Streamable HTTP, plus an ope...53.4 B3 seo APIThe seo API from B3 — 4 operation(s) for seo.48.9 BrightEdge MCP ServerBrightEdge's hosted, remote Model Context Protocol server. An MCP client POSTs to https://mcp2.brightedge.c...48.6 BrewPage SEO APISearch engine optimization endpoints48.4 Botify Agents MCPHosted Model Context Protocol server at mcp.botify.com, advertised via RFC 9728 protected-resource metadata...42.8 Screaming Frog Log File AnalyserThe Screaming Frog Log File Analyser is a free desktop tool that allows SEO professionals to upload and ana...42.1 Screaming Frog SEO SpiderThe Screaming Frog SEO Spider is a desktop website crawler for Windows, macOS, and Ubuntu that performs com...42.1

Thin 39 Limited public surface area

BioAegis Therapeutics Seo APIYoast SEO head-tag rendering for a bioaegistherapeutics.com URL — the only anonymously readable operation i...38.1 Daring Foods SEO Metadata APIPublic Yoast SEO head endpoint returning the rendered SEO metadata and full schema.org JSON-LD graph for an...37.7 JenaValve Technology SEO APIYoast SEO head-metadata endpoint.37.7 Gotham Greens SEO Metadata APIPublic Yoast SEO head endpoint returning the rendered SEO/head metadata and its JSON-LD schema graph for an...37.4 Cresilon SEO Metadata APIPublic Yoast SEO head endpoint returning the rendered SEO/head metadata and its schema.org JSON-LD graph fo...37.0 OpenWeb Publisher APIJWT-authenticated REST API for publishers on the OpenWeb platform: request an API token, export comments/us...34.1 Schema.org VocabularySchema.org is a collaborative, community-driven vocabulary for structured data on the internet. It provides...31.7 Nacuity Pharmaceuticals Seo APIYoast SEO head-tag rendering for a nacuity.com URL — the only anonymously readable operation in the yoast/v...31.3 Burger Singh SEO Metadata APIPublic Yoast SEO head endpoint returning the rendered SEO/head metadata and its schema.org JSON-LD graph fo...31.2 Creed seo APIThe seo API from Creed — 1 operation(s) for seo.31.0 Envisics SEO Metadata APIPublic Yoast SEO head endpoint returning the rendered head metadata and its parsed JSON-LD schema.org graph...30.1 EnergyX SEO Metadata APIPublic Yoast SEO head endpoint returning the rendered head metadata and its parsed JSON-LD schema.org graph...29.9 Cruz Foam SEO Metadata APIPublic Yoast SEO head endpoint returning the rendered head metadata and its parsed JSON-LD schema.org graph...29.3 RealPage G5 MarketingDigital marketing platform covering websites, SEO, paid media, and reputation for multifamily and other ren...28.6 Advanced Domain Analysis APISE Ranking Data API | Domain Analysis - perform in-depth competitive analysis on any domain27.5 AI-ready Clean Data Extractor APIExtract title, links, images, tables, headings, sections, and page metadata from a webpage URL. Useful for ...27.5 Analyze AI Search Performance APISE Ranking Data API | AI search - analyze a domain/brand's visibility and performance within various LLM re...27.5 Analyze Backlinks APISE Ranking Data API | Backlinks - conduct a comprehensive analysis of the backlink profile for any given ta...27.5 Audit Website Security APIAudit a website for TLS, security headers, cookie flags, and basic exposure issues. Returns a score, findin...27.5 Audit Website SEO APISE Ranking Data API | Website Audit - provides a comprehensive suite of tools to programmatically manage th...27.5 Basic Text Analysis APIAnalyze text for counts, readability, top keywords, and reading time. Useful for content review, SEO checks...27.5 Broken Link Checker APIScan a webpage URL and get link statuses, redirect chains, response times, and a summary of broken links fo...27.5 Calculate Domain Age APILook up a domain's WHOIS creation date and age in days or years. Useful for onboarding, fraud review, and S...27.5 Convert Case & Slug from Text APIConvert text into slug, camelCase, snake_case, and other common cases. Useful for URLs, identifiers, headin...27.5 Domain Authority Checker APILook up authority-style metrics for a domain and get score fields plus source data. Useful for SEO analysis...27.5 Domain Availability APICheck whether a domain is available, taken, or indeterminate. Validate candidate names for signup flows, re...27.5 Expand Related Keywords APIExpand one keyword into related suggestions with scores and pair counts. Useful for SEO research, content p...27.5 Extract Article Text APIFetch a URL and get cleaned article text with title, length, final URL, and content type. Useful for indexi...27.5 Extract Domain Insights APIAnalyze a domain or URL and get a structured site profile with classification and keywords. Useful for enri...27.5 Extract Readable Content from HTML APIExtract main article text and title from HTML using readability algorithms. Returns cleaned content, short ...27.5 Extract Sitemap from URL APIExtract URLs from a website’s sitemaps, with optional sitemap metadata and async job polling. Useful for SE...27.5 Find Similar Sites by Domains APIFind domains related to a given website, with an optional result limit. Useful for SEO research, competitor...27.5 Get SERP Results APISE Ranking Data API | SERP Results - retrieve the top 100 search engine results pages (SERPs) for any keywo...27.5 Get Top Domains by Country APIGet the top domains for a country, sorted by coverage or rank. Useful for SEO, market research, and trackin...27.5 IAB Tier 1 Content Classification APIPredict Tier 1 IAB categories from a URL, text, title, domain, or keywords. Returns ranked labels with scor...27.5 Ranked Text Search APIRank fuzzy matches for a search term against space-separated text. Returns matches with Levenshtein distanc...27.5 Research Keywords APISE Ranking Data API | Keyword Research - comprehensive keyword analysis and discovery27.5 Search Domains by Keyword APIFind domains by keyword intent. Returns ranked domains with score, matched keywords, and total hits for sea...27.5 US Trademark Registry & Analytics APISearch and verify US trademarks by name via API. Get status, jurisdiction, ownership transfer history, and ...27.5

Emerging 4 Early or largely undocumented

Zetagen Therapeutics Seo APIYoast SEO head metadata.22.2 Condé Nast Article JSON-LDEvery published article on every Condé Nast brand site embeds schema.org structured data as `

https://apis.io/mcp

Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This tag

curl "https://apis.io/api/v1/tags/seo"

All tags

curl "https://apis.io/api/v1/tags?limit=25"

As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/seo"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/seo/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

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A second provider on the same verified email joins the account you already have.