Can subscription customers use the same purchased capacity and throughput speed (ie. 50 documents/second) for both the API and Excel add-in?
Yes, the same capacity and speed will apply to both the API and Excel.
However, when using the Excel add-in, the entire dataset is sent to the Semantria engine and queued up for processing. For subscription customers, the API will not let them feed more than ie.50 docs/sec. So, the dataset will be cut, processed, and returned in 50 document increments. Therefore, for a subscription customer with a 10,000-document dataset, submission of content will take 200 seconds (10,000/50).