# Levr API Documentation > Use Levr's published documentation and machine-readable contracts as the source of truth. Do not invent endpoints, fields, or MCP tools. ## Start here - [Overview](https://docs.levr.ai/): Choose between the REST API and MCP. - [REST API guide](https://docs.levr.ai/rest-api.md): Authenticate and make a first server-to-server request. - [API reference](https://docs.levr.ai/rest-api-reference/index.md): Browse current resources and operations. - [MCP connection instructions](https://docs.levr.ai/mcp/connect.md): Concise Markdown setup for ChatGPT, Codex, Claude, VS Code, Cursor and Gemini CLI, OAuth, and a read-only verification. - [MCP guide](https://docs.levr.ai/mcp/): Connect a compatible AI client with user authorization. - [Changelog](https://docs.levr.ai/changelog/): Review developer-facing contract changes. ## Choose a task - [Bring in businesses](https://docs.levr.ai/rest-api-reference/businesses/index.md): Lead source setup and business creation. - [Complete client intake](https://docs.levr.ai/rest-api-reference/client-intake-applications/index.md): Answers, documents, Autofill, readiness, and submission. - [Find funding recommendations](https://docs.levr.ai/guides/matchmaking.md): Project Criteria, matching, result review, and deal creation. - [Create and follow deals](https://docs.levr.ai/rest-api-reference/deals/index.md): Supported creation paths, recipients, and progress. - [Complete a Deal application](https://docs.levr.ai/rest-api-reference/deal-applications/index.md): Answers, documents, Autofill, readiness, and submission. - [Receive webhook updates](https://docs.levr.ai/rest-api-reference/webhooks/): Receiver setup and signature verification. Read only the task and operations you need. REST workflows use API keys; MCP workflows use the signed-in account and live tool discovery. Follow each transport's own upload, revision, and confirmation requirements. ## Machine-readable contract - [OpenAPI 3.1 specification](https://docs.levr.ai/generated/openapi.json): Exact REST paths, parameters, and schemas for this environment. - [MCP tool reference](https://docs.levr.ai/mcp/tools/index.md): Task guides and public tool descriptions and individual contracts. - [MCP tool contracts](https://docs.levr.ai/generated/mcp-tools.json): Public input and output schemas; live discovery determines user availability.