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We support historical tax rates starting from 2023.
1,000 requests per minute. If you have a potential use case for over 1,000, let us know.
About 400 milliseconds
Yes. There are no restrictions to using an AI application or agent to build your integration, as long as it can be certified with a Zamp representative.
Yes, calculations can be handled through a different source if you choose.
No, not at this time.
No, not at this time. 
Not on a single transaction in Zamp. If there are multiple shipping addresses on a single transaction, pass each shipping address as an individual transaction call.
Zamp manages sandbox and production accounts within the same environment using the same base URL, but customers will have individual test and live accounts.