OpenAPI Spec Directory
Every API in our index that publishes an OpenAPI/Swagger spec — ranked by agentic readiness.
4365
Sites Indexed
37
Avg Score
609 entries in this directory
lichess.org • Free Online Chess
lichess.org
Free online chess server. Play chess in a clean interface. No registration, no ads, no plugin required. Play chess with the computer, friends or random opponents.
OpenAPI
developer
20
+20 OpenAPI
missing +25 llms.txt
I
20
+20 OpenAPI
missing +25 llms.txt
MusclesWorked — The Exercise Data Layer for Fitness Platforms
musclesworked.com
Map any exercise to the exact muscles it works. 856 exercises, 63 muscles, 7,310 mappings. MCP Server + REST API for fitness apps, AI coaches, and health platforms.
OpenAPI
developer
20
+20 OpenAPI
missing +25 llms.txt
Black History Facts
blackhistoryapi.io
A black history fact collection, documenting achievements past and present..
OpenAPI
data
20
+20 OpenAPI
missing +25 llms.txt
20
+20 OpenAPI
missing +25 llms.txt
J
20
+20 OpenAPI
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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