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Your rate limit for synchronous requests will depend on your plan.
PlanSync Rate Limit
Starter60 requests per minute
Business240 requests per minute
Scale360 requests per minute
Asynchronous requests have a higher rate limit of 1.000 request per minute for both plans. Batch requests (/batch endpoints) have a rate limit of 50 requests per minute for both plans. Since each batch request can contain up to 20 items, this still allows generating up to 1.000 PDFs per minute. After that, you’ll hit the rate limit and receive a 429 response error code. To prevent this, we recommend reducing the rate at which you request the API. This can be done by introducing a queue mechanism or reducing the number of concurrent requests per second. If you have specific requirements, contact support to request a rate increase.