Show HN: Free Foreign Exchange and Crypto Rates API

GET

/api/rates

Get current forex rates between currencies

Response:

{ "base": "USD", "rates": { "EUR": 0.85, "GBP": 0.73, "JPY": 110.0, "BTC": 0.00001 } }

GET

/api/convert

Convert amount between currencies

Response:

{ "amount": 100, "from": "USD", "to": "EUR", "result": 85.0 }

GET

/api/historical/rates

Get historical forex rates for a specific date

Response:

{ "date": "2024-01-01", "base": "USD", "rates": { "EUR": 0.90, "GBP": 0.79, "JPY": 148.5 } }

GET

/api/historical/timeseries

Get time series data for a date range (max 5 years)

Response:

{ "start_date": "2024-01-01", "end_date": "2024-01-03", "base": "USD", "data": { "2024-01-01": {"EUR": 0.90}, "2024-01-02": {"EUR": 0.89}, "2024-01-03": {"EUR": 0.88} } }

GET

/api/currencies

List all available currencies

Response:

{ "currencies": [ "USD", "EUR", "GBP", "JPY", "BTC", "ETH", "AUD", "CAD" ], "count": 593 }

GET

/api/historical/limits

Get historical data availability per currency

Response:

{ "currencies": { "EUR": { "earliest_date": "1999-01-01", "latest_date": "2025-12-31", "total_days": 9664 } }, "total_currencies": 170 }

GET

/api/vat/rates

Get current VAT rates for EU countries

Response:

{ "vat_rates": { "DE": { "country_code": "DE", "country_name": "Germany", "vat_rate": 19.0 }, "FR": { "country_code": "FR", "country_name": "France", "vat_rate": 20.0 } } }