Frankfurter MCP is an MCP server that exposes the Frankfurter API's currency exchange data to language models and MCP clients. It provides MCP tools to query supported currencies, latest exchange rates for a given base currency, conversions using the latest rates, and historical rates for a date or date range. To improve performance, the server caches responses with two strategies: an LRU cache for data that does not change across parameters (e.g., historical rates) and a TTL cache for faster-changing data (e.g., latest rates), with a default TTL of 15 minutes. Cache behavior and sizes are configurable via environment variables (LRU_CACHE_MAX_SIZE, TTL_CACHE_MAX_SIZE, TTL_CACHE_TTL_SECONDS). The server can run with stdio, SSE, or streamable HTTP transports; when using HTTP transports, endpoints are available at /sse (SSE) or /mcp (streamable HTTP). It supports configuration through FAST_MCP_HOST/PORT and FRANKFURTER_API_URL to point to the deployment. The server can be started via uv, installed from PyPI, or run in Docker. Available MCP tools include get_supported_currencies, get_latest_exchange_rates, convert_currency_latest, get_historical_exchange_rates, and convert_currency_specific_date.