I am looking for a currency exchange rate provider (preferrably) JSON format , that is free/open and also reliable.
Anybody here have any experiences working with some solutions like this?
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I don't think there are any accurate Json provider of that, as the exchange rate is moving so fast and it can only be achieved either by a paid plugin or by fetching it from a trusted source that allows it or you can take approval to use their rate by just sending an email.