Making calls to the HIBP email address search API requires a rate limited key you can purchase on either a monthly or yearly basis. If you've already purchased a key, you'll be able to manage it after verifying you have access to the email address you wish to use (you'll receive a unique link to that address). If you need help, check out the FAQs and troubleshooting guide or submit a support request.
$3.50
per month
$35
per year
A rate limited key allowing 10 requests per minute
$15
per month
$150
per year
A rate limited key allowing 50 requests per minute
$25
per month
$250
per year
A rate limited key allowing 100 requests per minute
$100
per month
$1,000
per year
A rate limited key allowing 500 requests per minute