Forum Discussion

Anonymous's avatar
Anonymous
Not applicable
7 years ago
Solved

Historical exchange rate API

Hi,   I am looking for a way to get historical exchange rates into my report - also daily updated rates - and I have been looking at ecb.europa.eu and their rest API, but find it difficult;  does ...
Need Help
  • Anonymous's avatar
    Anonymous
    7 years ago

    Anonymous I would suggest first creating a table with sequential dates on each row. Then by invoking the function, it will send the dates to the function one by one thus returning the exchange rate info for each day. You can use this example which first generates a list of dates of the past 365 days (this is updated with every refresh) and invokes the function:

     

    let
    Source = {Number.From(Date.AddDays(DateTime.Date(DateTime.LocalNow()),-365))..Number.From(DateTime.Date(DateTime.LocalNow()))},
    #"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Changed Type" = Table.TransformColumnTypes(#"Converted to Table",{{"Column1", type date}}),
    #"Renamed Columns" = Table.RenameColumns(#"Changed Type",{{"Column1", "Date"}}),
    #"Invoked Custom Function" = Table.AddColumn(#"Renamed Columns", "ExchangeRates", each Fn_GetHistoricExchangeRates(Date.ToText([Date],"yyyy-MM-dd"))),
    #"Expanded ExchangeRates" = Table.ExpandTableColumn(#"Invoked Custom Function", "ExchangeRates", {"Currency", "Rate"}, {"Currency", "Rate"}),
    #"Changed Type1" = Table.TransformColumnTypes(#"Expanded ExchangeRates",{{"Rate", type number}, {"Currency", type text}})
in
    #"Changed Type1"

    In order for it to work you should create a function named Fn_GetHistoricExchangeRates, by using the code in my previous post.

     

    Hope that helps!


    Jan

  • Anonymous's avatar
    Anonymous
    Not applicable
    7 years ago

    Hi TeigeGao,

     

    Thx for your reply.

    I should've been more specific:

     

    What I am trying to achieve is to have a line chart with historical rates that refreshes with new datapoints every day. 

    ECB has a syntax to do that, but I can't seem to get it to work.

    https://sdw-wsrest.ecb.europa.eu/help/ 

     

    • Anonymous's avatar
      Anonymous
      Not applicable
      7 years ago

      Anonymous I have recently created a simple function that extracts exchange rate information from the site https://exchangeratesapi.io/ which gets its data from the ECB site:

      let
    Source = (Date as text) => let
        Source = Json.Document(Web.Contents("https://api.exchangeratesapi.io/" & Date & "?base=USD")),
        rates = Source[rates],
        #"Converted to Table" = Record.ToTable(rates),
        #"Renamed Columns" = Table.RenameColumns(#"Converted to Table",{{"Name", "Currency"}, {"Value", "Rate"}})
    in
        #"Renamed Columns"
in
    Source

      Using a datetable or generated range of dates, you can then invoke the custom function like this:

      = Table.AddColumn(#"Removed Other Columns", "Rates", each Fn_GetHistoricCurrencyRates(DateTime.ToText([Date],"yyyy-MM-dd")))

      Hope that helps!

       

      Jan

      • Anonymous's avatar
        Anonymous
        Not applicable
        7 years ago

        Anonymous this looks promising, I stumbled upon that site as well.

        I am totally inexperienced with this; "invoke function" lets me enter parameter as date - should I fill in a range of dates and then use the second function you mention? 

  • Anonymous's avatar
    Anonymous
    Not applicable
    7 years ago

    So you update the URL everytime you want new data? 

    Should be possible to get the latest data added to your previous queries and cached responses.