Authentication and the Have I Been Pwned API

Frankly, USD3.50/month for API access is still an incredible bargain for a service of this quality. Normal users can still use the webpage form to look themselves up for free, API users pay a nominal fee that should cover the cost of the resources they consume.

The only concern I can think of is that this opens the gate to raising the fee in the future to profit from it, considering that Troy is "selling out" soon [1] and will not be in control of the service for ever. HIBP is the kind of service I think ought to be provided by a non-profit entity. But Troy's record is good, so I have faith that he will do his best to pick a good new home for HIBP.

[1] https://www.troyhunt.com/project-svalbard-the-future-of-have...