Is the lookup performed synchronously or async?

Single Requests

All single requests are processed synchronously. You receive the result the moment the request is sent. This approach allows for immediate results but limits the number of requests you can send per minute.

Bulk Requests

You can submit a large list of requests, all of which will be processed asynchronously according to your default interval: requests per minute. You can use webhooks to receive results for each individual request, or wait until the entire list has been processed and receive an email that containing a CSV file with the results.