With a free account (email registration required) you can get 5000 free API calls credited to your account (available after public Beta starts). The free account is meant for developers to use while evaluating the KBSPortal.com service and experimenting with it in their applications.
Charges are based on the servers and other infrastructure costs. There are no volume discounts.
On your account settings page you can purchase blocks of one million API calls for $5 per block.
You can use the account settings page to monitor the status of your account and the number of remaining API calls you have.
Billing for API calls assumes a block size of less that 512 characters of input text. Larger amounts of input text to process count as multiple API calls in the billing system: one API unit is charged for each 512 characters of input text.
Note: I try to price this service so that approximately a third of the usage fees pay my server costs and two thirds of the usage fees fund paying my salary for further development of the Clojure KBSPortal NLP software.
Note on billing: In order to reduce the cost of billing for API calls, I use "statistically accurate billing": 4.5% of the times you make API calls, I charge you for 20 API calls. This gives you a small discount and reduces my server charges because I don't have to hit a persistent data store as often.
A license to run the KBSPortal web app on your own servers is available for $1000 per server; this includes one year of software updates. A maintenance contract for software updates is available for $250/year after the first year of included maintenance. You can use a single maintenance contract to update multiple server licenses with new software upgrades.