We do not impose any limit on the file size when sending a request.
As per our updated policies, we have only one plan which is fair and suits both small and big companies. The rates are applied automatically based on the total size of files in megabytes (MB) that you process in one month. The file size is counted each time you perform a save operation on a document. The following article explains in detail what API calls count as Billable operation:
For more information regarding our Pricing Plan, please read following articles:
If you require any further information, feel free to contact us.