* Daniele Nicolodi <[email protected]> [2020-11-07 00:29]:
> I would like to standardize and automate the retrieval of currency
> exchange rates. However, I haven't been able to find a service that
> offers easy and free access at historical data.

These two look imho interesting:

Exchange Rates API
https://exchangeratesapi.io/
Exchange rates API is a free service for current and historical foreign 
exchange rates
published by the European Central Bank

Open Exchange Rates
https://openexchangerates.org/

> I am not even sure that different sources agree on what is the mid
> market daily average exchange rate. I am almost ashamed of my
> ignorance int his field. Is there a think like an "official" number?
> Which sources does people use?

I don't think there's an "official" number but I'll let the experts
comment.

-- 
Martin Michlmayr
https://www.cyrius.com/

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