Calculated Shipping Rate by third party app with basic plans.

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Hi all.

I've read in the documentation that to be able to programatically calculate shipping rate and write it to the customer checkout one has to have an Advanced plan, or pay a basic plan annually, or even pay and extra $20 monthly (I understand I'm talking about the CarrierService:[versio...) . The thing is, we use the basic plan, and there's a third party app that calculates the shipping, even though I don't pay annually, nor the extra for shipping calculations.

How is that possible? Is there a secret API resource that I might be missing?