Bing Translation API : Limited translation & Paid api policy(schedule)?

I heard Bing Translation API Limitation Policy that is 50 request(per min). 

If use of api excess limitaion, print error code and reuse after 2minutes later.

I want 1,000 requset (per min) service but it is impossible that current condition.

So, if MS plan to paid translation api polocy or schedule, please let us know it. 

Thank you.