# DealFilter.ai > DealFilter.ai is the spam filter and deal manager for IT freelancers in the DACH project market: AI-based analysis of incoming project inquiries, match scores against the freelancer profile, market rate assessment and reply drafting. Premium and Ultra plans include developer access via REST API, MCP server and CLI. All developer surfaces authenticate with a personal API key (`df_...`, created under Settings > API Access) or an OAuth connector token (`dfo_...`) in the `Authorization: Bearer` header. The MCP endpoint is `POST https://dealfilter.ai/api/mcp` (Streamable HTTP, OAuth discovery via `/.well-known/oauth-protected-resource`). ## Documentation - [API, MCP server and CLI reference](https://dealfilter.ai/llms-full.txt): complete developer reference as plain markdown - authentication and key management, REST API v1 endpoints, MCP server setup (Claude Desktop, Claude Code, claude.ai connector), OAuth flow, CLI commands, error reference and the async submit/polling contract - [Developer docs, English (HTML)](https://dealfilter.ai/en/docs): rendered version of the same reference - [Entwickler-Doku, Deutsch (HTML)](https://dealfilter.ai/de/docs): deutsche Fassung der Referenz ## Optional - [Product website (German)](https://dealfilter.ai/de): what DealFilter does, plans and pricing - [Blog (German)](https://dealfilter.ai/de/blog): practical articles on AI-supported project acquisition for freelancers