Amazon Translate uses simply pay-as-you-go pricing, you are billed monthly for the number of characters of text that you processed. Amazon Translate is priced at $15 per million characters. Price is per character sent to the API for processing, including whitespace characters.
Get started with Amazon Translate for free. The Free Tier is available to you for 12 months, starting from the date on which you create your first translation request. When your free usage expires, or if your application use exceeds the free usage tier, you simply pay standard, pay-as-you-go service rates.