# Currency converter

> Free currency converter on central-bank reference rates: the European Central Bank's daily euro rates, and the Bank of Canada's for any pair with CAD. Dated and sourced.

Canonical page: https://superbooks.io/tools/currency-converter/

GET https://app.superbooks.io/api/tools/currency?from=USD&to=EUR&amount=100 answers the converted amount, the rate, its source and its publication date.

## Sources

- European Central Bank reference rates: https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html
- Bank of Canada daily exchange rates: https://www.bankofcanada.ca/rates/exchange/daily-exchange-rates/

## Questions

### Which exchange rate does the converter use?

The European Central Bank's euro reference rates, published each working day, crossed through the euro for pairs without it. Any pair with the Canadian dollar uses the Bank of Canada's daily exchange rate instead. Every result shows the rate, its source and the date it was published.

### Why is my bank's rate different?

Reference rates are published for information. Neither central bank deals at them, and a bank or card that converts a payment applies its own rate and usually a fee on top.

### Which rate should I use on an invoice or in my books?

Whatever rate your tax authority or accountant asks for. Many accept a published central-bank rate for the transaction date, which is why the result shows the date the rate was published.