"google translate" vs "translate api"

According to the link below, nothing prevents you.

https://translate.googleapis.com/translate_a/single?client=gtx&sl=en&tl=es&dt=t&q=Hello

Set your requests content-type to application/json and it fixes the weird formatting, I found the uri pattern after bashing around the google websites for a while.

I wouldn't recommend translating the bible with it but I've done ~10k words this week without an issue.

If anyone finds another working client value I'd love to know.

There is nothing stopping you from using the Google Translate site, other than accessibility. The public API gives you a much tighter integration than, say, trying to embed Google Translate into your site via a frame.