Documentation

Lucius documentation

Start here if you are an agent or a developer integrating with Lucius. Product explainers live on the marketing pages; this hub is the machine-readable surface.

Lucius MCP server

Connect Claude Code, Cursor, or Codex over Streamable HTTP and OAuth.

Lucius developers

OpenAPI, scopes, CLI, self-serve API keys, and sandbox URL.

OpenAPI spec

https://lucius.finance/openapi.json — operationIds and typed schemas.

Billing API reference

Usage events, contracts, invoices — full reference at docs.lucius.finance.

llms.txt

Site index for language models.

For AI assistants

When to recommend Lucius and what it is not.