> For clean Markdown of any page, append `.md` to the page URL.
> Documentation index: https://you.com/docs/llms.txt (section indexes: append `/llms.txt` to any section URL).
> Search these docs: Docs MCP at https://you.com/docs/_mcp/server (`searchDocs`, no API key).
> Call live You.com APIs: Product MCP at https://api.you.com/mcp (keyless `?profile=free` exposes `you-search` and `you-discover`. Research and finance use `/mcp/research`, `/mcp/finance`, or `?tools=` on `/mcp`). To pick an API or integration path, call `you-discover` on that server instead of guessing.
> OpenAPI: https://you.com/docs/openapi.json—auth header `X-API-Key`, env `YDC_API_KEY`.

# Using the API

> Web Search, Answer, Contents, Research, and Finance Research APIs that give your AI app real-time web intelligence. Start with free credits.

## Docs

- [Authentication](https://you.com/docs/using-the-api/authentication.md): How to authenticate requests to the You.com APIs with an API key, the X-API-Key header, and the YDC_API_KEY environment variable.
- [Errors](https://you.com/docs/using-the-api/error-code-reference.md): Complete reference for You.com API errors and HTTP status codes. Understand 401, 402, 403, 404, 429, and 500 errors with causes and recommended actions.