Frankfurter Currency Exchange MCP Server
MCP server wrapping the Frankfurter API — a free currency exchange rate API backed by European Central Bank (ECB) data. Enables AI agents to query current and historical foreign exchange rates for 30+ currencies, convert amounts between currencies, and track rate timeseries for financial calculations.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Public read-only API. No credentials. HTTPS. Financial context — validate outputs.
⚡ Reliability
Best When
An agent needs currency conversion or historical exchange rate data for financial calculations, reporting, or multi-currency support — using free ECB-backed rates without API keys.
Avoid When
You need real-time forex rates for trading decisions or cryptocurrency conversions. Frankfurter provides daily ECB reference rates, not live market rates.
Use Cases
- • Currency conversion calculations from financial analysis agents
- • Historical exchange rate lookups for accounting and reporting agents
- • Multi-currency pricing calculations from e-commerce or billing agents
- • Forex rate monitoring for international business intelligence agents
Not For
- • Real-time trading or arbitrage (ECB rates are daily, not tick-by-tick)
- • Exotic or cryptocurrency pairs (30+ major fiat currencies only)
- • High-frequency financial operations requiring millisecond accuracy
Interface
Authentication
No authentication required. Frankfurter API is completely free and public — no API key needed.
Pricing
Frankfurter.app is free open source backed by ECB reference rates. MCP server is free open source. Zero cost to use.
Agent Metadata
Known Gotchas
- ⚠ FINANCIAL RISK: Currency rates used in financial calculations — validate outputs before business-critical use
- ⚠ ECB rates are daily reference rates — not real-time market rates; 1-day lag on latest rates
- ⚠ Frankfurter.app is community-maintained — no formal SLA; add retry logic for production use
- ⚠ Covers 30+ major fiat currencies (EUR base) — limited for exotic currencies or crypto
Alternatives
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Scores are editorial opinions as of 2026-03-07.