[LarkaUZ_]

It is not. Users subscribe and they receive a mail informing them that the Scan will be launched shortly. Once the scan is over the user receive the scan report on his mailbox. This is the service we provide...

[GordonS]

From the guidelines:

"Blog posts, sign-up pages, and fundraisers can't be tried out, so they can't be Show HNs"

The only way to try out your service is to hand over card details.

[LarkaUZ_]

Well this is a paid service... This is not a sign up page onlt. If we follow your logic any service that require card details can't be submitted to HN.

[grzm]

The distinction is they aren't appropriate for "Show HN". They may be submitted as normal submissions.