The per-minute limit is 1/10th of the hourly limit, and it resets every minute. To increase the per-minute limit, you increase the per-hour limit. For example, an hourly limit of 10k calls translates to a per-minute limit of 1,000 calls.
By convention, the hourly limit is set to 10k links/hour upon onboarding an Enterprise account. If you would like to increase your limits, please contact our sales team or reach out to your Account Manager if you have a managed account.