verifySignature, are considered non-billable and are free for the purposes of billing. You will find more details about these methods in the Signed API Docmentation.
verifySignaturecan still be invoked for a key that is stopped. You can stop your API keys from the API Dashboard.
On January 20th, Joe creates an API key with a Virtual Item Gambling license. This license tier has a base cost of $30.00 per month, which includes 30,000 requests. Joe needs to have at least $30 (the base fee) in prepaid credit in his RANDOM.ORG account for the key to be created. However, no charges are made to his prepaid credit until January 31st.
From January 20th to 31st, Joe issues 15,000 requests with his API key to RANDOM.ORG's Signed API.
At the end of January 31st, Joe is billed for his key. There are 12 days from January 20th to 31st inclusive, so the prorated base cost of the key is $30.00×(12/31) = $11.61 and the prorated number of requests included in this price is 30,000×(12/31) = 11,613.
Since Joe has used more requests than is included (prorated), he will be charged for the remaining 15,000−11,613 = 3,387 requests. The cost is $0.001 per request with his key, so the extra requests will cost $0.001×3,387 = $3.39.
The total cost for Joe at the end of January is therefore $11.61+$3.39 = $15.00. The amount will be taken from the prepaid credit in Joe's RANDOM.ORG account.
Joe's API key runs for all of February, but he uses only 25,000 requests that month. Since the license for his key includes 30,000 monthly requests, he is charged the base fee of $30.00 for his key at the end of February. The 5,000 requests that he did not use in February do not roll over to March.
If Joe does not have enough prepaid credit in his RANDOM.ORG account at the end of February to pay for his key, his prepaid credit balance will become negative. He will receive an email notification and a grace period of two days to top it up. If his balance is still negative after two days, his API keys will be stopped and no further charges will be incurred. Joe can top up his prepaid credit and start his key at any point in time after that.
Jill has an API key with a Social Gambling license, which she is using to drive a card game. The base cost for this license is $50.00 per month, which includes 5,000 requests per month. Additional requests cost $0.01 each. Jill has been using the key for several months but now wishes to stop running the game temporarily.
From June 1st to June 5th, Jill made 750 requests with her API
key. On June 6th, she uses the API Dashboard to stop her API
key. RANDOM.ORG immediately stops serving requests that
generate values with her API key, although she can still get
past results and verify signatures, since the methods
are not billable.
At the end of June, Jill is billed for the use of her key. The billing is prorated, because she stopped her key on June 6th. The last request Jill issued with her key was on June 5th, so the prorated base fee is $50.00×(5/30) = $8.33. The number of requests included in this charge is also prorated and works out at 5,000×(5/30) = 833. Since this is higher than the actual number of requests Jill used in June, there is no additional cost, and Jill's prepaid credit is only charged $8.33 at the end of June.
Jill can start her key again at any time, and it will not incur fees until she does so. Hence, if she does not start her key again in July, there will be no charge at the end of July.