Google Translate API收费标准

Usage fees:
    Translation:
        $20 per 1 M characters of text, where the charges are adjusted in proportion to the number of characters actually provided.
    Language Detection:
        $20 per 1 M characters of text, where the charges are adjusted in proportion to the number of characters actually provided.
Usage limits:
    Google Translate API has a default limit of 2M chars/day. This limit can be increased up to 50M chars/day in the Quotas pane in the Google APIs Console
    If you need to translate more than 50 M chars/day, please contact us

引用

https://developers.google.com/translate/v2/pricing?hl=zh-CN