Business plan monthly API rate limits

We are looking to interact with millions of files. We have noticed on the box site that Enterprise business plan has a limit of 100,000 API calls per month.
Can this rate be increased?
If so, what can it be increased to?

Hello -

Yes, you can purchase additional calls. We in developer relations don’t have the most up to date sales information. You will want to contact a sales representative in order to get more answers!

Alex, Box Developer Advocate