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 →

Exemplar 1 Complete, well-documented, and agent-ready

Matomo SEO APIThe SEO API lets you access a list of SEO metrics for the specified URL: Bing indexed pages and age of the ...70.5

Strong 7 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...64.4 Yoast Schema APIThe Yoast Schema API provides a PHP interface for customizing the Schema.org JSON-LD structured data output...64.4 Yoast Surfaces APIThe Yoast Surfaces API provides a PHP interface for retrieving SEO metadata programmatically within WordPre...64.4 SE Ranking MCP ServerHosted remote Model Context Protocol server exposing 217 tools and 5 prompts across three SE Ranking surfac...61.8 CONNSKILL Growth Services MCP ServerModel Context Protocol surface for the same catalogue: a hosted Streamable-HTTP endpoint at agent.connskill...57.1 AnyAPI Seo APIThe seo API from AnyAPI — 14 operation(s) for seo.55.3 B3 Seo APIThe seo API from B3 — 4 operation(s) for seo.55.0

Developing 9 Usable, with meaningful gaps to close

CrawlGraph MCP ServerHosted remote Model Context Protocol server at https://crawlgraph.com/mcp over Streamable HTTP, plus an ope...53.2 Oxylabs SERP Scraper APISearch-engine results page scraping for Google (Search, Ads, Images, Lens, Maps, Suggest, Shopping, Travel,...52.1 BrightEdge MCP ServerBrightEdge's hosted, remote Model Context Protocol server. An MCP client POSTs to https://mcp2.brightedge.c...51.9 Moz APIThe Moz API is a JSON-RPC 2.0 API accessed through HTTP POST requests to a single universal endpoint, https...46.8 Moz MCP Server - DataBeta remote Model Context Protocol server exposing Moz Data API tools (site metrics, links, keywords, ranki...46.8 BrewPage SEO APISearch engine optimization endpoints46.6 Botify Agents MCPHosted Model Context Protocol server at mcp.botify.com, advertised via RFC 9728 protected-resource metadata...45.0 Screaming Frog Log File AnalyserThe Screaming Frog Log File Analyser is a free desktop tool that allows SEO professionals to upload and ana...41.9 Screaming Frog SEO SpiderThe Screaming Frog SEO Spider is a desktop website crawler for Windows, macOS, and Ubuntu that performs com...41.9

Thin 30 Limited public surface area

_done Seo APIThe seo API from _done — 1 operation(s) for seo.35.2 OpenWeb Publisher APIJWT-authenticated REST API for publishers on the OpenWeb platform: request an API token, export comments/us...34.7 Creed Seo APIThe seo API from Creed — 1 operation(s) for seo.34.3 Schema.org VocabularySchema.org is a collaborative, community-driven vocabulary for structured data on the internet. It provides...30.1 Advanced Domain Analysis APISE Ranking Data API | Domain Analysis - perform in-depth competitive analysis on any domain27.9 AI-ready Clean Data Extractor APIExtract title, links, images, tables, headings, sections, and page metadata from a webpage URL. Useful for ...27.9 Analyze AI Search Performance APISE Ranking Data API | AI search - analyze a domain/brand's visibility and performance within various LLM re...27.9 Analyze Backlinks APISE Ranking Data API | Backlinks - conduct a comprehensive analysis of the backlink profile for any given ta...27.9 ApyHub SEO APIThe SEO API from ApyHub — 7 operation(s) for seo.27.9 Audit Website Security APIAudit a website for TLS, security headers, cookie flags, and basic exposure issues. Returns a score, findin...27.9 Audit Website SEO APISE Ranking Data API | Website Audit - provides a comprehensive suite of tools to programmatically manage th...27.9 Basic Text Analysis APIAnalyze text for counts, readability, top keywords, and reading time. Useful for content review, SEO checks...27.9 Broken Link Checker APIScan a webpage URL and get link statuses, redirect chains, response times, and a summary of broken links fo...27.9 Calculate Domain Age APILook up a domain's WHOIS creation date and age in days or years. Useful for onboarding, fraud review, and S...27.9 Convert Case & Slug from Text APIConvert text into slug, camelCase, snake_case, and other common cases. Useful for URLs, identifiers, headin...27.9 Domain Authority Checker APILook up authority-style metrics for a domain and get score fields plus source data. Useful for SEO analysis...27.9 Domain Availability APICheck whether a domain is available, taken, or indeterminate. Validate candidate names for signup flows, re...27.9 Expand Related Keywords APIExpand one keyword into related suggestions with scores and pair counts. Useful for SEO research, content p...27.9 Extract Article Text APIFetch a URL and get cleaned article text with title, length, final URL, and content type. Useful for indexi...27.9 Extract Domain Insights APIAnalyze a domain or URL and get a structured site profile with classification and keywords. Useful for enri...27.9 Extract Readable Content from HTML APIExtract main article text and title from HTML using readability algorithms. Returns cleaned content, short ...27.9 Extract Sitemap from URL APIExtract URLs from a website’s sitemaps, with optional sitemap metadata and async job polling. Useful for SE...27.9 Find Similar Sites by Domains APIFind domains related to a given website, with an optional result limit. Useful for SEO research, competitor...27.9 Get SERP Results APISE Ranking Data API | SERP Results - retrieve the top 100 search engine results pages (SERPs) for any keywo...27.9 Get Top Domains by Country APIGet the top domains for a country, sorted by coverage or rank. Useful for SEO, market research, and trackin...27.9 IAB Tier 1 Content Classification APIPredict Tier 1 IAB categories from a URL, text, title, domain, or keywords. Returns ranked labels with scor...27.9 Ranked Text Search APIRank fuzzy matches for a search term against space-separated text. Returns matches with Levenshtein distanc...27.9 Research Keywords APISE Ranking Data API | Keyword Research - comprehensive keyword analysis and discovery27.9 Search Domains by Keyword APIFind domains by keyword intent. Returns ranked domains with score, matched keywords, and total hits for sea...27.9 US Trademark Registry & Analytics APISearch and verify US trademarks by name via API. Get status, jurisdiction, ownership transfer history, and ...27.9

Emerging 4 Early or largely undocumented

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.

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