Open-Source Read-Only Financial Market Data MCP Server for Agents
DaoCacaoo · reddit · 2026-08-11
A developer released lse-data-mcp, an open-source local MCP server for financial market data, designed to allow AI clients to query data safely without brokerage or execution access.
- Tool Coverage: Supports about 22,000 instruments with 15 tools providing OHLCV candles, company fundamentals, insider transactions, option chains, and macro economic calendars.
- MCP Design Philosophy:
- Strictly Read-Only: The upstream API has no write endpoints, and all tools carry readOnlyHint annotations.
- Unified Envelope: Results include a truncated field so clients know if they received the full answer. It respects response-size budgets without silently dropping rows.
- Local Validation & Security: Dates are validated locally to save API quota, and API keys are securely stored in the OS credential store.
- The author also seeks community feedback on MCP tool granularity (whether grouping small discovery operations behind one tool is the right approach).
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