An extension of Airtable's Currency Conversion script: https://airtable.com/developers/scripting/examples/currencyconverter
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Rather than assuming what currency you want to convert to, this script pulls in the list of all known conversions into its own table (using USD as the base currency). You can then create links to this table to pull out the corresponding currency conversion rate. Re-running the script updates the conversion rate, which then propagates to all linked records and calculations.