Frankfurter

Frankfurter API is an online platform which fetches current and historical exchnge rate data.

ingestr supports Frankfurter as a source primarily to demonstrate ingestr's features since the API doesn't require any authentication.

URI format

The URI format for Frankfurter is as follows:

frankfurter://?base=<currency-code-here>

URI parameters:

• base: defines the base currency code (e.g. EUR, USD, IDR) used to calculate the exchange rates.

Set-Up Frankfurter Integration

Let's say you want to fetch the exchange rates for a certain period with the base currency as Indian Rupees. Here's a sample command that will copy this data into your DuckDB database:

ingestr ingest \
--source-uri 'frankfurter://?base=INR' \
--interval-start '2025-03-20' \ 
--interval-end '2025-03-28' \       
--source-table 'exchange_rates' \    
--dest-uri 'duckdb///frankfurter.duckdb' \
--dest-table 'my_schema.exchange_rates'

The result of this command will be a list of currency exchange rates from 20.03.2025-28.03.2025 with INR as the base currency in your DuckDB database.

Tables

Frankfurter source allows ingesting the following sources into separate tables:

Table	PK	Inc Key	Inc Strategy	Details
currencies	-	–	replace	Retrieves list of available currencies with ISO 4217 codes and names.
latest	["date", "currency_code", "base_currency"]	–	merge	Fetches latest exchange rates for all currencies.
exchange_rates	["date", "currency_code", "base_currency"]	date	merge	Retrieves historical exchange rates for specified date range.

Use these as --source-table parameter in the ingestr ingest command.

Notes:

• The arguments --interval-start and --interval-end are only relevant for the table exchange_rates.
• If a start date but no end date is specified, then the end date will default to today's date and ingestr will retrieve data up until the latest published data.
• Note that the Frankfurter API only publishes updates Monday-Friday. If the given date is on the weekend, the date will default to the previous Friday.