Calling it
What is served
The derived measures carry
sourceTier: "financialdatapi_derived", so it is always
visible which figures are the publisher’s and which are ours.
ECB reference rates are a daily fixing, not a live quote. They are published once
each business day, around 16:00 CET, and are the right input for research and the wrong
input for execution.
Quoting convention
Pairs follow the ECB’s convention, which is euro base where the euro is involved.EURUSD is dollars per euro. Inverting a pair to match a different convention is your
call to make explicitly rather than something the API guesses at.
Weekends and target holidays have no fixing. Gaps in the series are the calendar, not
missing data.