OpenAPI Spec Directory
Every API in our index that publishes an OpenAPI/Swagger spec — ranked by agentic readiness.
5749
Sites Indexed
39
Avg Score
988 entries in this directory
A
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
A
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
A
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
A
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
A
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
M
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
Marketcaper - Cross Market Cap Comparer
marketcaper.com
Compare stocks, ETFs, funds, crypto, billionaire net worth, GDP, and fiat currencies by market cap, AUM, GDP, FX market cap, and net worth.
OpenAPI
Schema.org
MCP
other
35
+20 OpenAPI
+10 MCP
missing +25 llms.txt
M
MCP Data Converter — Convert Any Data Format, Instantly
mcp-converter.tnkng.com
Convert between 16 data formats with 240 conversion pairs. JSON, CSV, XML, YAML, PDF, Excel, DOCX and more. MCP-native, AI agent ready, production hardened.
OpenAPI
API
developer
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
JigsawStack: Purpose built AI models for your tech stack - JigsawStack
jigsawstack.com
Custom small models trained for specialized use cases powered by scalable infrastructure
OpenAPI
API
developer
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
Developer Platform | LanOnasis Documentation
docs.lanonasis.com
Build applications and AI agents with durable memory, semantic search, MCP tools, and supported developer clients.
OpenAPI
API
developer
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
A
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
Web3GPT
w3gpt.ai
Deploy smart contracts, create AI Agents, do more onchain with AI.
OpenAPI
API
ai-tools
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
M
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
ScrapeNinja Web Scraping API: Turns websites into data, on scale. 🚀
scrapeninja.net
OpenAPI
API
data
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
A
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
A
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
R
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
ZipCodeAPI - Zip Code Distance, Radius and Location API
zipcodeapi.com
US and Canadian Zip Code Distance, Radius and Location API.
OpenAPI
API
data
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
LinkPreview API - Free Link Preview Service
linkpreview.net
Preview Web links with our reliable API service. Get Detailed JSON Response for any URL.
OpenAPI
API
developer
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
Postcode & Geolocation API for the UK | Postcodes.io
postcodes.io
Search, validate and geolocate UK postcodes. Retrieve the latest administrative and geospatial information for postcodes
OpenAPI
API
data
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
Wire NHS into your agent — MCP server
Add Not Human Search as an MCP tool. Your agent can call search_agents, get_site_details, get_stats, and submit_site at runtime.
Claude Code
claude mcp add --transport http nothumansearch https://nothumansearch.ai/mcp
Other clients: point any MCP-compatible tool at
https://nothumansearch.ai/mcp (streamable-http transport).Use NHS via REST
Prefer plain HTTP? Hit the search endpoint directly.
Search API
curl "https://nothumansearch.ai/api/v1/search?q=payment+API"
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