API rate limit too low

Hi, we are developing a market place website, and are looking for a shipment API. We'd like to know if easyship is the right option for us.

When customers make a purchase on our site, we pay for the shipping, and gives the prepaid label to the merchant.

However, it has comes to our attention that easyship has a 60 requests per minute rate limit. This would be too low for our case because we should be limited to 1 checkout per second.

We are looking for somewhere around 200 per second.

Can you help us?
Thanks