Q: Can I be charged for sending the same request multiple times?
A: No. Once a particular generation has been requested, all subsequent requests by you and any other user are free. After making a request with a specific set of parameters, the url becomes public and authentication is not necessary for subsequent access.

Q: How many requests can I send?
A: New accounts start with a rate limited to 16 requests per 10 seconds. This limit can be increased upon request.

Q: Will the free tier continue to exist?
A: For the near-term the free tier will continue to function for testing and demo purposes, but its capacity will be limited and secondary to paying users.

Q: Can my account balance go negative?
A: No. It usually takes a minute or two for requests to be deducted from your balance. If your balance reaches zero subsequent requests won't complete.