Google states on its Google Translate API pricing page that you need to configure billing to be able to use the translation API. In other words, there is no free level of use.
Important: The Google Translate v2 API requires payment information for all accounts that can start using the service.
This text is available on https://cloud.google.com/translate/v2/pricing.
Therefore, you should not use the translation API at all if you do not have an account.
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