Change parameter back and forth between 2-3 values for a sequence of query requests in Power Query

Hi,

I'm running a couple of API requests that pulls all the stock information from a list for hundreds of stocks. Unfortunately, I'm running into a couple of issues:

• Because my the API provider only allows 5 calls per minute, I need to use the InvokeAfter feature to delay my call.
• However due to the number of calls I'm making, my query load time exceeds the 120 minutes on the Power BI service.

I'm trying to cut down on the time by using multiple API keys to pull the data faster. Unfortunately, I don't know how to parameterize the pull of API keys dynamically in a Power Query script to switch between 2-3 different keys after each call.

Meaning:

1. First stock is pulled with APIkey_1
2. Second stock is pulled with APIkey_2
3. Third stock is pulled with APIkey_3
4. Forth stock is pulled with APIkey_1 (as i reuse just 2-3 keys without exceeding the allotted 5 calls per API key per minute).
5. Fitfh stock is pulled with APIkey_2 (as i reuse just 2-3 keys without exceeding the allotted 5 calls per API key per minute).
6. Sixth stock is pulled with APIkey_3 (as i reuse just 2-3 keys without exceeding the allotted 5 calls per API key per minute).
7. ... and so on.

FYI, here is my query below, relevant pieces are highlighted with red and blue. Also, my query runs fine other than the issue mentioned above.

Thank you for your answer in advance!

Best,

DT

let
    Source = Json.Document(Web.Contents("https://data.opendatasoft.com/api/records/1.0/search/?dataset=cusip-isin-sp-500-nasdaq-100%40public-us&rows=600")),
    records = Source[records],
    #"Converted to Table" = Table.FromList(records, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Expanded Column1" = Table.ExpandRecordColumn(#"Converted to Table", "Column1", {"datasetid", "recordid", "fields", "record_timestamp"}, {"datasetid", "recordid", "fields", "record_timestamp"}),
    #"Expanded fields" = Table.ExpandRecordColumn(#"Expanded Column1", "fields", {"cusip_number", "ticker", "company_name", "isin_code"}, {"cusip_number", "ticker", "company_name", "isin_code"}),
    #"Removed Columns" = Table.RemoveColumns(#"Expanded fields",{"datasetid", "recordid", "cusip_number", "isin_code", "record_timestamp"}),
    #"Added Custom" = Table.AddColumn(#"Removed Columns", "Custom", each Function.InvokeAfter(()=>Json.Document(Web.Contents("https://www.alphavantage.co/",
    [RelativePath="query?function=TIME_SERIES_DAILY_ADJUSTED&outputsize=full&apikey=" & APIkey_1 & "&symbol=" & [ticker]])), #duration(0,0,0,6))),
    //I would like to dynamically change the "APIkey_1" above to "APIkey_2", then "APIkey_3", then back to "APIkey_1", then "APIkey_2", then "APIkey_3", and so on.
    #"Expanded Custom" = Table.ExpandRecordColumn(#"Added Custom", "Custom", {"Time Series (Daily)"}, {"TimeSeries"}),
    #"Expanded TimeSeries" = Table.ExpandRecordColumn(#"Expanded Custom", "TimeSeries", Table.ColumnNames(Table.FromRecords(#"Expanded Custom"[TimeSeries]))),
    #"Unpivoted Columns" = Table.UnpivotOtherColumns(#"Expanded TimeSeries", {"ticker", "company_name"}, "Attribute", "Value"),
    #"Expanded Value" = Table.ExpandRecordColumn(#"Unpivoted Columns", "Value", {"5. adjusted close", "7. dividend amount"}, {"Value.5. adjusted close", "Value.7. dividend amount"}),
    #"Renamed Columns" = Table.RenameColumns(#"Expanded Value",{{"Attribute", "Date"}, {"Value.5. adjusted close", "Adjusted close"}, {"Value.7. dividend amount", "Dividend"}}),
    #"Changed Type1" = Table.TransformColumnTypes(#"Renamed Columns",{{"Adjusted close", type number}, {"Dividend", type number}}),
    #"Extracted Last Characters" = Table.TransformColumns(#"Changed Type1", {{"Date", each Text.End(_, 10), type text}}),
    #"Parsed Date" = Table.TransformColumns(#"Extracted Last Characters",{{"Date", each Date.From(DateTimeZone.From(_)), type date}}),
    #"Filtered Rows" = Table.SelectRows(#"Parsed Date", each true),
    #"Renamed Columns1" = Table.RenameColumns(#"Filtered Rows",{{"company_name", "Company name"}, {"ticker", "Ticker"}})
in
    #"Renamed Columns1"