Our ECB foreign exchange data scraper provides us with accurate data about exchange rates between the world's most important fiat currencies. Its data source is the data from this table:
{% embed url="https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html" %}
We use the fx data to generate and normalize our asset prices that were collected in pairs with different fiat currencies.