Nexar API calls are limited by the number of "parts" returned rather than the number of calls made. Only supply queries (prefixed "sup") that return parts and their data will count against a user's part limit. Therefore, design queries for Altium 365 data (prefixed "des") or supply queries that do not return parts and their data such as a query for categories will not cost anything.
By default, an application with the supply scope will have access to 1000 parts per month. Please find here a link to our supply plans.
If you wish to learn more, here's an article on part limits and how they work.
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