OpenAPI Spec Directory
Every API in our index that publishes an OpenAPI/Swagger spec — ranked by agentic readiness.
4358
Sites Indexed
37
Avg Score
608 entries in this directory
OpenCode | The open source AI coding agent
opencode.ai
OpenCode - The open source coding agent.
OpenAPI
API
developer
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
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
A
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
A
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
Documentation | Art Institute of Chicago API
api.artic.edu
The Art Institute of Chicago's API provides JSON formatted data as a REST-style service that allows developers to explore and integrate the museum’s data into their projects. This API is the same tool that powers our website, our mobile app, and many other technologies in the museum.
OpenAPI
API
data
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
V
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
S
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
S
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
MCP for Zotero - Connect Zotero with AI
mcpforzotero.alejandroarnaud.dev
Connect your Zotero library with ChatGPT, Claude, and other AI assistants via MCP
OpenAPI
API
developer
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
M
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
M
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
M
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
M
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
M
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
35
+20 OpenAPI
+15 structured API
missing +25 llms.txt
FirstData - Global Authoritative Data Source Knowledge Base | MCP Server
firstdata.deepminer.com.cn
FirstData provides 290+ authoritative data sources for MCP and AI agents, including government data, academic research, and verified datasets. Build smarter AI applications with trusted data.
OpenAPI
API
developer
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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