TigZig offers several free MCP servers that an AI agent (Claude, ChatGPT or your own client) can add as connectors and call as tools:
- Database Query - read-only SQL over Postgres and DuckDB.
- Yahoo Finance - financials, prices and market data for any ticker.
- Technical Analysis - indicator plus chart-read technical reports.
- QRep / FFN - security and portfolio performance and risk reports.
- Markdown to PDF - render a report to a PDF URL.
Most are open source (see the repos linked from each service). The full catalog, with per-server cards and endpoints, is at https://www.tigzig.com/apis. A machine-readable directory of the servers is at https://www.tigzig.com/.well-known/mcp/servers.json.
Building something like this? How I work covers the rates, the availability and what I take on.