Can I POST multiple Constituent custom fields in the same request?

Having a bit of trouble with going over the API rate limit by POSTing a bunch of custom fields to a few thousand records. Is there a way to batch these new custom fields into a JSON array that returns an array of all their IDs once created - or is it only 1 custom field per request? I'd like to see if there is a more efficient way to POST this data to minimize requests in the daily quota.


Thanks!

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