Frankfurter

Frankfurter is an open-source currency data API that tracks daily exchange rates from institutional sources.

The public API runs at https://api.frankfurter.dev. If you prefer to host your own instance, you can run Frankfurter with Docker.

The quickest way to get started:

docker run -d -p 8080:8080 lineofflight/frankfurter

For production, mount a volume to persist the SQLite database across container restarts and set any optional API keys:

docker run -d -p 8080:8080 \
  -e DATABASE_URL=sqlite:///app/data/frankfurter.sqlite3 \
  -e FRED_API_KEY=your_key \
  -e TCMB_API_KEY=your_key \
  -v ./data:/app/data \
  --pull always \
  lineofflight/frankfurter

Without a mounted volume, the database is ephemeral and some endpoints may return empty data until their initial backfill completes.

Two data providers require API keys. Both are free and optional:

• FRED_API_KEY — Federal Reserve data. Register at fred.stlouisfed.org.
• TCMB_API_KEY — Turkish Central Bank data. Register at evds3.tcmb.gov.tr.

See AGENTS.md for development setup and guidelines.

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