# We > Ultrarich API

> Free, no-auth, read-only REST API and MCP server for comparing any wealth to billionaire and trillionaire fortunes. Deterministic arithmetic, published formulas.

Authentication: None required. Do not send an API key.
Rate Limits: REST 100 req/min, MCP 300 req/min.
Licence: Results CC BY 4.0 — free for any purpose, including commercial. Attribution required.

## Machine-Readable
- OpenAPI Spec: https://api.wegtultrarich.org/openapi.yaml (also .json)
- MCP Endpoint (POST): https://api.wegtultrarich.org/mcp
- MCP Server Card: https://api.wegtultrarich.org/.well-known/mcp.json
- Agent Prompt: https://api.wegtultrarich.org/agent-prompt.md
- Wealth Figures CSV: https://wegtultrarich.org/data/

## Project
- Website & Comparison Tool: https://wegtultrarich.org
- Full Project Context: https://wegtultrarich.org/llms-full.txt