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Allegro.pl - convert prices to EUR JS - 1/16/2022, 1:31:29 AM - Convert prices to EUR. You have to get a free API key from https://free.currencyconverterapi.com/ in order to use this script. The first time you use it on allegro, you will receive a prompt for the API key. It will keep prompting until you provide a valid key. If you don't want to see the prompt, turn off the script.