# Frankfurter

**Canonical:** https://apis.io/providers/frankfurter/  
**Website:** https://frankfurter.dev  
**APIs profiled:** 6

Frankfurter is an open-source (MIT) currency exchange rates API that blends foreign-exchange reference rates published by 50+ central banks and monetary authorities. It hosts a free, no-key public endpoint at api.frankfurter.dev (current v2 and frozen v1) and ships as a Docker image for unlimited self-hosting. Historical data extends back to 1948 and covers 201 currencies; the API serves JSON, NDJSON, and CSV.

## Kin Score — 39.9 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 39.9).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 66.2 |
| Governance | 25.0 |
| Contract Governance | 25.0 |
| Operational Transparency | 39.5 |
| Developer Ergonomics | 14.3 |
| Commercial Clarity | 21.1 |
| Access Clarity | 21.1 |

## Agent readiness — 31.6 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | na |
| Error Semantics | no |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |

## Access

Freemium · Open access — onboarding: open, pricing: freemium, trial: no (confidence: medium).

## APIs (6)

- **Frankfurter Currencies API** — Supported currency reference data
- **Frankfurter current-rates API** — Latest foreign exchange rates
- **Frankfurter historical-rates API** — Historical exchange rates for specific dates and periods
- **Frankfurter metadata API** — API reference data like available currencies
- **Frankfurter Providers API** — Central-bank and institutional data providers
- **Frankfurter Rates API** — Blended currency exchange rates

## Agentic access (1)

- **Frankfurter Agentic Access** — 10 operations

## Security (1)

- **Frankfurter Domain Security** — TLSv1.3

## Plans (1)

- **Frankfurter Plans Pricing**

## Use cases (7)

- **Treasury and Payments Pricing** — Embed blended FX rates into invoicing, payouts, and conversion.
- **E-commerce Storefront Localization** — Convert displayed prices into the visitor's currency on page load.
- **Reporting and Analytics** — Backfill historical FX into BI dashboards and finance reports.
- **Reference Data Maintenance** — Sync ISO 4217 currency tables and provider metadata into ERPs.
- **AI Assistant Tooling** — Equip Claude and other MCP-capable agents with the official Frankfurter MCP server (get_rates, convert, list_currencies, list_providers).
- **Private FX Service** — Self-host inside a VPC for compliance-sensitive workloads.
- **Academic and Research** — Long historical series for FX econometric studies.

## Tags

Currency Exchange, Foreign Exchange, FX, Open-Source, MIT, Self-Hosted, Public APIs

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/frankfurter/). Scores are computed from the provider's own public artifacts under a published rubric.