Quick links
Quickstart
Make your first API call in under a minute.
MCP Servers
Connect Claude, Cursor, or any AI agent — 19 tools, 2 resources, 2 prompts. One-click via Smithery.
Changelog
Latest updates to the API, docs, and MCP servers.
API Reference
Explore all endpoints with interactive examples.
Use Cases
Ideas and code examples for what you can build.
For AI agents
Connect the MCP server and the agent gets 19 tools for search, lookup, and cross-references. No key needed.- Set up the MCP server in Claude, Cursor, or another client
- Agent guide: the recommended flow from table of contents to search to context
- Listed on Smithery and Glama
llms.txtfor a plain-text summary of the API
Base URL
Features
- Full-text search with ranked results across all paragraphs
- Semantic search using vector embeddings for meaning-based queries
- MCP servers at
/mcp-servers— 19 tools + 2 resources + 2 prompts for Claude, Cursor, and other AI agents (one-click install via Smithery) - Function-calling schemas at
/tools/openaiand/tools/anthropic— drop-in tool definitions for the OpenAI and Anthropic SDKs - Three paragraph ID formats auto-detected from the reference string
- 4,400+ entities — beings, places, orders, races, religions, concepts
- Audio narration with multiple TTS models and voices per paragraph
- OpenAPI spec at
/openapi.jsonfor client generation - No authentication required — free and open
Built with the API
Interactive Demo
Live examples: semantic search, random quotes, audio playback, entity exploration, and passage lookup.
UrantiaHub
A reading site for the Papers. It gets its text from this API.
Dalamatia
A story game set in Paper 66. Every quoted paragraph comes from this API.
Donate
Help Keep This Project Free
This API is free and open source. If it’s useful to you, consider donating to keep the infrastructure running.