Re: loop through sources

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 It's all about getting third party data via API's

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If I got your idea correctly, you could store the parameters in one column and call the API row by row. Check a simple demo below. You could check the returned json by clicking Moscow weather json.

let
    Source = Table.FromRecords({  
    [city= "Moscow",cid=524901],  
    [city= "Paris",cid=2988507],  
    [city= "London",cid=2643743]}),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"cid", type text}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "responseJson", each Json.Document(Web.Contents("http://api.openweathermap.org/data/2.5/forecast/city?id="&[cid]&"&APPID=76acd9a867adb4cd9120298d16b3655f")))
in
    #"Added Custom"